GB1042317A - Methods of determining hydroxyl groups - Google Patents
Methods of determining hydroxyl groupsInfo
- Publication number
- GB1042317A GB1042317A GB4323662A GB4323662A GB1042317A GB 1042317 A GB1042317 A GB 1042317A GB 4323662 A GB4323662 A GB 4323662A GB 4323662 A GB4323662 A GB 4323662A GB 1042317 A GB1042317 A GB 1042317A
- Authority
- GB
- United Kingdom
- Prior art keywords
- compound
- test
- hydroxylic
- anhydride
- materials
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Expired
Links
Classifications
-
- G—PHYSICS
- G01—MEASURING; TESTING
- G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
- G01N25/00—Investigating or analyzing materials by the use of thermal means
- G01N25/20—Investigating or analyzing materials by the use of thermal means by investigating the development of heat, i.e. calorimetry, e.g. by measuring specific heat, by measuring thermal conductivity
- G01N25/48—Investigating or analyzing materials by the use of thermal means by investigating the development of heat, i.e. calorimetry, e.g. by measuring specific heat, by measuring thermal conductivity on solution, sorption, or a chemical reaction not involving combustion or catalytic oxidation
Landscapes
- Chemical & Material Sciences (AREA)
- Engineering & Computer Science (AREA)
- Chemical Kinetics & Catalysis (AREA)
- Combustion & Propulsion (AREA)
- Physics & Mathematics (AREA)
- Health & Medical Sciences (AREA)
- Life Sciences & Earth Sciences (AREA)
- Analytical Chemistry (AREA)
- Biochemistry (AREA)
- General Health & Medical Sciences (AREA)
- General Physics & Mathematics (AREA)
- Immunology (AREA)
- Pathology (AREA)
- Investigating Or Analyzing Materials Using Thermal Means (AREA)
- Investigating Or Analyzing Non-Biological Materials By The Use Of Chemical Means (AREA)
Abstract
The hydroxyl group content of a hydroxylic compound is determined by reacting with excess carboxylic acid anhydride, in the presence of a little concentrated H2SO4 which acts as a catalyst, thereby esterifying all the hydroxyl groups in a rapid exothermic reaction, and measuring the resulting temperature rise. The acid anhydride may be aliphatic, such as acetic, propionic or butyric anhydride. One per cent of H2SO4 based on the anhydride is adequate. The reaction is performed in a Dewar flask and maximum temperature is reached in about 30 seconds. The result is compared with results of similar tests on the same compound of known hydroxyl number to determine that of the test compound. The test is applicable to materials such as alcohols, phenols, polyethers and particularly the routine testing of polyester resin to determine its degree of esterification during production. The compound being tested for hydroxyl content should be free of water, but the test is applicable to measuring the water content of non-hydroxylic materials such as acetic acid, or of hydroxylic materials of known hydroxyl number.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| GB4323662A GB1042317A (en) | 1962-11-15 | 1962-11-15 | Methods of determining hydroxyl groups |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| GB4323662A GB1042317A (en) | 1962-11-15 | 1962-11-15 | Methods of determining hydroxyl groups |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| GB1042317A true GB1042317A (en) | 1966-09-14 |
Family
ID=10427861
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| GB4323662A Expired GB1042317A (en) | 1962-11-15 | 1962-11-15 | Methods of determining hydroxyl groups |
Country Status (1)
| Country | Link |
|---|---|
| GB (1) | GB1042317A (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| WO2012006837A1 (en) * | 2010-07-16 | 2012-01-19 | 常州天合光能有限公司 | Method for testing cross-linking rate of ethylene vinyl acetate (eva) in photovoltaic solar battery pack |
-
1962
- 1962-11-15 GB GB4323662A patent/GB1042317A/en not_active Expired
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| WO2012006837A1 (en) * | 2010-07-16 | 2012-01-19 | 常州天合光能有限公司 | Method for testing cross-linking rate of ethylene vinyl acetate (eva) in photovoltaic solar battery pack |
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