WO1991005816A1 - Changements discontinus, reversibles et provoques par la lumiere dans le volume des gels - Google Patents

Changements discontinus, reversibles et provoques par la lumiere dans le volume des gels Download PDF

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Publication number
WO1991005816A1
WO1991005816A1 PCT/US1990/006142 US9006142W WO9105816A1 WO 1991005816 A1 WO1991005816 A1 WO 1991005816A1 US 9006142 W US9006142 W US 9006142W WO 9105816 A1 WO9105816 A1 WO 9105816A1
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WIPO (PCT)
Prior art keywords
gel
change
gels
temperature
polymer
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PCT/US1990/006142
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English (en)
Inventor
Akira Mamada
Toyoichi Tanaka
Dawan Kungwatchakun
Masahiro Irie
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Massachusetts Institute Of Technology
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Publication of WO1991005816A1 publication Critical patent/WO1991005816A1/fr

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    • C—CHEMISTRY; METALLURGY
    • C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
    • C08J—WORKING-UP; GENERAL PROCESSES OF COMPOUNDING; AFTER-TREATMENT NOT COVERED BY SUBCLASSES C08B, C08C, C08F, C08G or C08H
    • C08J3/00—Processes of treating or compounding macromolecular substances
    • C08J3/02—Making solutions, dispersions, lattices or gels by other methods than by solution, emulsion or suspension polymerisation techniques
    • C08J3/03—Making solutions, dispersions, lattices or gels by other methods than by solution, emulsion or suspension polymerisation techniques in aqueous media
    • C—CHEMISTRY; METALLURGY
    • C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
    • C08J—WORKING-UP; GENERAL PROCESSES OF COMPOUNDING; AFTER-TREATMENT NOT COVERED BY SUBCLASSES C08B, C08C, C08F, C08G or C08H
    • C08J3/00—Processes of treating or compounding macromolecular substances
    • C08J3/02—Making solutions, dispersions, lattices or gels by other methods than by solution, emulsion or suspension polymerisation techniques
    • C08J3/09—Making solutions, dispersions, lattices or gels by other methods than by solution, emulsion or suspension polymerisation techniques in organic liquids
    • C—CHEMISTRY; METALLURGY
    • C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
    • C08J—WORKING-UP; GENERAL PROCESSES OF COMPOUNDING; AFTER-TREATMENT NOT COVERED BY SUBCLASSES C08B, C08C, C08F, C08G or C08H
    • C08J3/00—Processes of treating or compounding macromolecular substances
    • C08J3/28—Treatment by wave energy or particle radiation

Definitions

  • This invention relates to novel gel compositions which are capable of discontinuous volume change of several hundred times induced by exposure to light.
  • Gel is a form of material between the liquid and the solid state. It consists of a crosslinked network of long polymer molecules with liquid molecules trapped within the network. Gels play important roles in various aspects of our everyday life.
  • gels are used extensively as matrices for chromatography and electrophoreses analytical methods that separate molecules according to their molecular weights and charges.
  • the pore size of the crosslinked polymer network plays an essential role in its sieving effects.
  • copolymers of acrylamide and sodium acrylate in gel form are capable of drastic volume change and it is also known that the gel showed continuous volume change when the concentration of the sodium component, which was an ionizable group, was smaller than the critical value, while the change became discontinuous when the concentration of the acrylic acid component was greater than the critical value.
  • the volume change of the conventional gels having an ionic group described above significantly depends on hydrogen ion concentration (pH) of the liquid medium to be used. Therefore, the conventional ionic gel could not be used when pH of the liquid medium could not be controlled sufficiently.
  • polymers containing no ionizable group formed from a monomer containing a predominant amount of a N-isopropylacrylamide and a crosslinking agent exhibit a drastic volume transition in water or mixtures of a solvent and water in response to change in liquid solvent composition. These gels do not depend upon hydrogen ion concentration of the liquid solvent.
  • Figure 1 shows swelling curves of gels in response to exposure to ultraviolet light as a function of temperature.
  • gels including a component capable of increasing a leng th of a molecular chain of a gel component, a release of an ionic component orcounter-ionsin response to exposure to photon energy or of decreasing the length of a molecular chain, or the entrapment of an ionic component or counter-ions in response to isolation to photon energy exhibit the phase transition function with discontinuous volume change.
  • the gel of this invention is composed of polymer and a photosensitive molecule together with a solvent composition which produces a gel having a critical concentration of the three components and which gel is capable of drastic volume change in response to exposure or isolation to photon energy.
  • the polymeric product of this invention has such a reversible phase transition function that brings a drastic volume change in response to changes in photon energy.
  • the gels of this invention are capable of exhibiting a drastic volume change when characterized by a critical concentration of polymer composition and solvent which produces the gel and which responds to exposure to or shielding from a source of photon energy which includes the d r a s t i c v o lume cha nge .
  • gel compositions which have a critical composition and are at a temperature such that they exhibit a drastic volume change when exposed to or shielded from photon energy.
  • the frequency of the photon energy or shielding from photon energy induces change in the molecular structure of the polymeric component of the gel which in turn induces the drastic volume change. Examples of such change in molecular structure are the folding or unfolding of the polymeric chains; the isomerization from the cis to trans form or from the trans to the cis form; or the formation of ionic species or the conversion of ionic species to a bound unitary molecular structure.
  • the gel In order for the gel to exhibit a drastic volume change in response to a condition of photon energy, the gel must have a concentration within a narrow critical concentration range and must be at a critical temperature within a narrow critical temperature range.
  • polymers which can be utilized to form the gel composition of this invention include polymers including ionizable moieties in the polymer chain which increase internal osmotic pressure within the gel when released as ions.
  • ions can be any ions and include sodium, potassium, chloride, cyanide and hydroxide.
  • Suitable polymers can be any water solube polymers since phase transition is found to be universl to any gels. Namely, they can be observed when a proper solvent composition and temperature are given.
  • polyacrylamide derivatives such as polyisopropylacrylamide, and poly-N-isopropyacrylamide, polystyrene sulfonate, gels made of polysaccharides such as ionized agarose, polypeptides such as geleting, and polynucletides such as DNA and RNA.
  • polymer chains which fold or unfold their microstructure in response to a condition of photon energy include polyacrylamide or poly-N-isopropylamide.
  • polymers which are changed between a cis structure and a trans structure include polyacrylamide, poly-N-isopropylamide. Any polymer can perform in the same manner so long as the gel state Is near the phase transition.
  • Representataive crosslinking agents include N,N'-methylene-bis acrylamide, ethylene glycol dimethacrylate,
  • the concentration of crosslinkable monomer is generally about 0.3 to 4 mole percent based upon the polymerizable monomer which is the main component.
  • the crosslinking agent effects partial crosslinking of the polymer and provides a means to control the strength, swelling degree, phase transition temperature and the like of the gel by changing the crosslinking density.
  • a mixture of these monomers can be polymerized using a polymerization initiator, e.g., a free radical initiator such as ammonium persulfate or sodium metal bisulfite, etc., with dilution with a solvent, e.g., water, a lower alcohol, hydrocarbon, etc., or without dilution.
  • a polymerization initiator e.g., a free radical initiator such as ammonium persulfate or sodium metal bisulfite, etc.
  • a solvent e.g., water, a lower alcohol, hydrocarbon, etc.
  • any method suitable selected from the conventionally well-known gelation methods may be applied.
  • Crosslinking can also be introduced to polymers by
  • any of a solvent which has the affinity with the above-mentioned polymerized product and is compatible with water for example, dimethylsulfoxide, dimethyIformamide, acetone, tetrahydrofuran, alcohol and the like, water, or a mixture of said solvent and water can be employed.
  • the kind, combination and composition ratio of these liquid mediums have an influence on the critical conditions for the reversible phase transition of the gel of this invention, e.g., temperature, etc., and the composition of the liquid medium can also be a critical condition in itself. Accordingly, suitable selection of the kind and composition of the liquid medium is required in accordance with the critical phase transition conditions desired for the gel.
  • the guideline for selection of a solvent in which the phase transition occurs is to choose one which has a temperature slightly lower than the desired phase transition
  • the gel of this invention is prepared by swelling the above-said polymerized product in the liquid medium.
  • the polymerized product having a low crosslinking degree absorbs a large amount of the liquid medium to form a gel having a large degree of swelling.
  • the gels of this invention thus prepared, however, never swell unlimitedly, but reach an equilibrium state in which the gel coexists with the excess liquid medium after swelling to its limit.
  • the liquid medium composition of the temperature of the gel can be changed to effect a drastic volume change of the gel.
  • the gel thus prepared is in a state wherein drastic phase transition occurs when the composition of the liquid medium is changed to reach the critical composition, i.e., where the volume shrinks discont inuously by releasing the liquid medium.
  • the gel volume swells discontinuously by releasing the liquid medium. Furthermore, when the temperature of the swelled gel is raised to exceed the critical temperature, the gel causes phase transition and releases the liquid medium, thereby shrinking the volume discontinuously. When the temperature drops below the critical temperature, the volume swells again discontinuously.
  • 1/T ⁇ S/ ⁇ H-2k/ ⁇ H ⁇ v o v o / ⁇ 2 [( ⁇ / ⁇ o ) 1/3 -(f+ 1/2)( ⁇ / ⁇ o )]+ ln(1- ⁇ )+ ⁇ + ⁇ 2 /2 ⁇
  • v o is the molar volume of water.
  • the sign in the denominator should be plus for gels which collapse at lower temperatures, and minus for gels which collapse at higher temperatures.
  • the gels as prepared are immersed in water in a tightly sealed vial around which temperature controlled water is circulated.
  • mercury lamp is used to illuminate the gel in the vial.
  • a conventional light source means such as standard ultraviolet lamp or laser.
  • the gel of this invention capable of drastic volume change can be used as an element to convert thermal energy to mechanical energy, a sensor element, a memory element a photomechanical transducer and the like and, additionally, can be applied to various fields such as artificial organs, emanataI appliances, toys, as well as measuring instruments and switches.
  • N-isopropylacrylamide was purified by recrystallization from the mixture of petroleum ether and toluene, as a neutral, main constituent, (NIPA, 0.97g), N,N'-Methylene-bis- acrylamide, crosslinker, (BIS,0.0003g), [Bis(4-dimethylamino- phenyl)-4-vinylphenyl-methane-leucocyanide], photo sensitive molecule (Leucoderivative and Azo-bis-isobutylonitrile, initiator, (AIBN, 0.05g), were dissolved in DMSO, (1.0g), and purified by distillation under nitrogen atmosphere.
  • the solution was then transferred into a polyethylene tube, having a 1.73 mm inner diameter wherein a reaction was carried out at 60oC for 4 hours. After the gelation was complete d, the 1.73 mm diameter gel was removed from the polyethylene tube, cut into 0.5 to 1 mm thick discs and then immersed in a large amount of deionized, distilled water to wash away residual chemicals and unreacted monomers from the polymer network. Water was repeatedly changed until the diameter of the gel reached an equilibrium value, which took approximately a week.
  • the diameter of the gel, d was measured by a microscope with a calibrated scale.
  • the swelling ratio of the gel, V/V o was calculated from the ratio of equilibrium gel diameter to the original diameter, (d/d o ), where d o was 1.733 mm.
  • the temperature was controlled within 0.04° C by circulating water during the measurement without ultraviolet irradiation.
  • a GATES MR-4 (wavelength 254 nm) was used for ultraviolet irradiation, and during illumination the temperature was controlled by not only circulating water but also with a thermomodule.
  • the color of the gels changed from pale green to dark green, and the volume change of the gels showed the discontinuous curve. That is, while irradiating the sample with ultraviolet light, the temperature was raised from 25°C gradually. At 32.6°C, the volume of gels suddenly decreased by approximately ten times. In contrast, when the temperature was lowered from 35oC by degrees, the gel became suddenly swollen as large as about ten times. There is a discontinuous volume transition between raising and lowering because of the hysteresis as to the change of the first phase transition. When the temperature was fixed at 31.0°C and the gel was exposed to ultraviolet light irradiation, the volume of the gels increased about ten times.
  • Phase transition of gels can be derived from its equation of state that relates three characteristic state variables of the gel: volume (V) or equivalent density of the polymer network ( ⁇ ), temperature (T) plus solvent composition (or polymer-solvent interaction parameter, ⁇ F), and the osmotic pressure ( ⁇ ).
  • V volume
  • ⁇ equivalent density
  • T temperature
  • ⁇ F solvent composition
  • ⁇ F polymer-solvent interaction parameter
  • ⁇ osmotic pressure
  • the rubber elasticity, ⁇ rubber which originates from the conf igurat ional entropy of the polymer network, provides a restoring pressure back to the reference polymer network density.
  • ⁇ rubber which originates from the conf igurat ional entropy of the polymer network, provides a restoring pressure back to the reference polymer network density.
  • ⁇ rubber When a polymer network is expanded, a negative pressure is created in the network and it shrinks back. On the other hand, when it is contracted, the pressure acts to expand to the original reference state. It is noteworthy that rubber becomes zero at ⁇ o .
  • ⁇ affinity In a poor solvent, the polymer network tends to shrink, whereas in a good solvent a gel tends to swell. The last factor is the osmotic pressure due to ionization of the polymer network, ⁇ ion .
  • the counter-ions within the gel create a gas-type pressure to expand the gel in proportion to the density of counter-ions as well as the absolute temperature, kT, where k is the Boltzmann constant.
  • Equation 6 temperature dependence of X is taken explicity in to account as shown in Equation 6 where ⁇ F represents the difference in the free e ⁇ ergy of a solvent molecule that is immersed in pure polymer compared with one that is surrounded entirely by molecules of the same kind, ⁇ H and ⁇ S are the corresponding enthalpy and entropy changes, respectively.
  • Equation 7 Equation 7
  • ⁇ o can be estimated fairly accurately from the experimental asymptotic value of V/V o toward high temperature, i.e., ⁇ o c0.065 ⁇ 0.075.
  • the maximum number of ⁇ can be estimated from an amount of crosslinker used, i.e., max ⁇ 1.0 X 10 22 1- 1 .
  • ⁇ H of IPA molecule can be estimated from the solubility parameter.
  • the value of ⁇ H so estimated is ⁇ H est ⁇ -1.6 X 1 0 -12 erg. It is clear from Eq. (6) that the transition temperature is mainly determined by the ratio ⁇ S/4H, while the curvature of a swelling curve is mainly determined by ⁇ H.

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  • Chemical & Material Sciences (AREA)
  • Health & Medical Sciences (AREA)
  • Chemical Kinetics & Catalysis (AREA)
  • Medicinal Chemistry (AREA)
  • Polymers & Plastics (AREA)
  • Organic Chemistry (AREA)
  • Dispersion Chemistry (AREA)
  • Compositions Of Macromolecular Compounds (AREA)
  • Addition Polymer Or Copolymer, Post-Treatments, Or Chemical Modifications (AREA)

Abstract

On décrit de nouvelles compositions de gels qui changent radicalement de volume de manière discontinue lorsqu'elles sont exposées à la lumière ou mises à l'abri de celle-ci.
PCT/US1990/006142 1989-10-23 1990-10-23 Changements discontinus, reversibles et provoques par la lumiere dans le volume des gels WO1991005816A1 (fr)

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US42578889A 1989-10-23 1989-10-23
US425,788 1989-10-23

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Cited By (8)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US5482719A (en) * 1992-10-30 1996-01-09 Guillet; James E. Drug delivery systems
WO1997023729A1 (fr) * 1995-06-07 1997-07-03 Urry Dan W Polymeres sensibles a l'energie electrique
US5843089A (en) * 1990-12-28 1998-12-01 Boston Scientific Corporation Stent lining
US5868719A (en) * 1997-01-15 1999-02-09 Boston Scientific Corporation Drug delivery balloon catheter device
US5954706A (en) * 1990-12-28 1999-09-21 Boston Scientific Corporation Drug delivery
US5976648A (en) * 1995-12-14 1999-11-02 Kimberly-Clark Worldwide, Inc. Synthesis and use of heterogeneous polymer gels
US6494861B1 (en) 1997-01-15 2002-12-17 Boston Scientific Corporation Drug delivery system
US6524274B1 (en) 1990-12-28 2003-02-25 Scimed Life Systems, Inc. Triggered release hydrogel drug delivery system

Families Citing this family (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPWO2009081592A1 (ja) * 2007-12-26 2011-05-06 国立大学法人九州大学 カーボンナノチューブ混合ポリマーゲル

Citations (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4732930A (en) * 1985-05-20 1988-03-22 Massachusetts Institute Of Technology Reversible, discontinuous volume changes of ionized isopropylacrylamide cells
EP0365011A2 (fr) * 1988-10-21 1990-04-25 Canon Kabushiki Kaisha Méthode de préparation d'un gel polymère, gel polymère et vérin l'employant

Patent Citations (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4732930A (en) * 1985-05-20 1988-03-22 Massachusetts Institute Of Technology Reversible, discontinuous volume changes of ionized isopropylacrylamide cells
EP0365011A2 (fr) * 1988-10-21 1990-04-25 Canon Kabushiki Kaisha Méthode de préparation d'un gel polymère, gel polymère et vérin l'employant

Non-Patent Citations (4)

* Cited by examiner, † Cited by third party
Title
Dialog Information Services, File 351, World Patent Index 81-91, Dialog accession no. 86-115572/18, Massachusetts Inst Tech et al: "Non-ionic gel with sensitive vol. changes comprises polymer without ionisable gps. obtd. by polymerising monomer contg. N-substd. (meth)acylamide deriv.", JP 61055180, A, 860319, 8618 (Basic) *
Macromolecules, Vol. 23, 1990 Akira Mamada et al: "Photoinduced Phase Transition of Gels ", *
NATURE, Vol. 346, 1990 Atsushi Suzuki et al: "Phase transition in polymer gels induced by visible light ", *
physical review letters, Vol. 38, No. 14, 1977 Toyoichi Tanaka et al: "Critical Behavior of Density Fluctuations in Gels ", *

Cited By (13)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US6409716B1 (en) 1989-12-15 2002-06-25 Scimed Life Systems, Inc. Drug delivery
US5843089A (en) * 1990-12-28 1998-12-01 Boston Scientific Corporation Stent lining
US7066904B2 (en) 1990-12-28 2006-06-27 Boston Scientific Scimed, Inc. Triggered release hydrogel drug delivery system
US5954706A (en) * 1990-12-28 1999-09-21 Boston Scientific Corporation Drug delivery
US6524274B1 (en) 1990-12-28 2003-02-25 Scimed Life Systems, Inc. Triggered release hydrogel drug delivery system
US6364893B1 (en) 1990-12-28 2002-04-02 Scimed Life Systems, Inc. Stent lining
US5482719A (en) * 1992-10-30 1996-01-09 Guillet; James E. Drug delivery systems
US5900405A (en) * 1994-01-24 1999-05-04 Bioelastics Research, Ltd. Polymers responsive to electrical energy
WO1997023729A1 (fr) * 1995-06-07 1997-07-03 Urry Dan W Polymeres sensibles a l'energie electrique
US5976648A (en) * 1995-12-14 1999-11-02 Kimberly-Clark Worldwide, Inc. Synthesis and use of heterogeneous polymer gels
US6194073B1 (en) 1995-12-14 2001-02-27 Kimberly-Clark Worldwide, Inc Synthesis and use of heterogeneous polymer gels
US6494861B1 (en) 1997-01-15 2002-12-17 Boston Scientific Corporation Drug delivery system
US5868719A (en) * 1997-01-15 1999-02-09 Boston Scientific Corporation Drug delivery balloon catheter device

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EP0497874A1 (fr) 1992-08-12

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