JP2013221153A - 表面官能化ナノ結晶セルロースを含む強化含フッ素ポリマー複合体を調製するための方法 - Google Patents
表面官能化ナノ結晶セルロースを含む強化含フッ素ポリマー複合体を調製するための方法 Download PDFInfo
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- JP2013221153A JP2013221153A JP2013077596A JP2013077596A JP2013221153A JP 2013221153 A JP2013221153 A JP 2013221153A JP 2013077596 A JP2013077596 A JP 2013077596A JP 2013077596 A JP2013077596 A JP 2013077596A JP 2013221153 A JP2013221153 A JP 2013221153A
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- fluorinated
- nanocrystalline cellulose
- functionalized
- ncc
- fluorine
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- 150000003141 primary amines Chemical class 0.000 description 1
- 239000000047 product Substances 0.000 description 1
- 125000001436 propyl group Chemical group [H]C([*])([H])C([H])([H])C([H])([H])[H] 0.000 description 1
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- FZHAPNGMFPVSLP-UHFFFAOYSA-N silanamine Chemical compound [SiH3]N FZHAPNGMFPVSLP-UHFFFAOYSA-N 0.000 description 1
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- UGZADUVQMDAIAO-UHFFFAOYSA-L zinc hydroxide Chemical compound [OH-].[OH-].[Zn+2] UGZADUVQMDAIAO-UHFFFAOYSA-L 0.000 description 1
- 229910021511 zinc hydroxide Inorganic materials 0.000 description 1
- 229940007718 zinc hydroxide Drugs 0.000 description 1
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- C08J5/00—Manufacture of articles or shaped materials containing macromolecular substances
- C08J5/04—Reinforcing macromolecular compounds with loose or coherent fibrous material
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- C08J2327/12—Characterised by the use of homopolymers or copolymers of compounds having one or more unsaturated aliphatic radicals, each having only one carbon-to-carbon double bond, and at least one being terminated by a halogen; Derivatives of such polymers not modified by chemical after-treatment containing fluorine atoms
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Abstract
【解決手段】ナノ結晶セルロースの外周がフッ素化基質で官能化されたフッ素官能基化ナノ結晶セルロースを形成するためにナノ結晶セルロースの表面をフッ素化求電子剤と反応させること、フッ素官能基化ナノ結晶セルロースを沈殿させることと、ならびにフッ素官能基化ナノ結晶セルロースを単離および精製することと、を含む、フッ素官能基化ナノ結晶セルロースを調製する方法、および該フッ素官能基化ナノ結晶セルロースを含フッ素ポリマーと接触させることを含む、強化含フッ素ポリマー複合体を調製する方法。
【選択図】なし
Description
実施形態においては、NCCは、セルロース繊維から得ることができる。これらのセルロース繊維は、無定形領域もしくは準結晶領域および結晶領域の2つの異なる領域を有することを特徴とする。一実施形態においては、NCCは、セルロース繊維の結晶領域と比較して酸の攻撃に対する弱い耐性を有するセルロース繊維の無定形領域もしくは不規則な準結晶領域の酸加水分解を通じて調製することができる。加水分解反応の間、セルロース繊維の無定形領域もしくは不規則な準結晶領域は加水分解され、結果的にこの欠陥での微小繊維の除去を生じる。結果的に、棒様形状または針様形状を有するNCC粒子が製造される。
実施形態においては、ナノ結晶セルロースの外周がフッ素化基質(例えば、フッ素化基、フッ素化種、および/またはフッ素化分子)で官能化されたフッ素官能基化NCC、および/または所望の場合、ナノ結晶セルロースの外周のみがフッ素化基質(例えば、フッ素化基、フッ素化種、および/またはフッ素化分子)で官能化された表面単独フッ素官能基化ナノ結晶セルロースを形成するようNCC表面をフッ素官能基化するために、以下の式
実施形態においては、強化含フッ素ポリマー複合体を形成するために、ナノ結晶セルロースの外周がフッ素化基質(例えば、フッ素化基、フッ素化種、および/またはフッ素化分子)で官能化されたフッ素官能基化NCC粒子、および/またはナノ結晶セルロースの外周のみがフッ素化基質(例えば、フッ素化基、フッ素化種、および/またはフッ素化分子)で官能化された表面単独フッ素官能基化ナノ結晶セルロースを、種々のポリマー複合体に組み込んでもよい。例えば、一実施形態においては、このようなフッ素官能基化NCC粒子は、強化含フッ素ポリマー複合体を形成する含フッ素ポリマー中に分散してもよい。例えば、フッ素官能基化NCC粒子は、約0.2〜約20重量%、または約0.5〜約15重量%など、約0.1〜約50重量%の量で含フッ素ポリマー中に分散することができる。NCCを含有するナノ複合体材料は、高い引張り強さおよび/または例えば万能Instron試験機(Instron、Norwood、Massachusetts)を使用して決定される%終局ひずみを含む改良した機械的特性を有することができる。
本明細書の実施形態においては、フッ素官能基化NCC粒子は、いくつかの方法で特徴づけてもよい。例えば、エネルギー分散型X線分光法(EDS)を使用して、局所的化学組成の分析を実施することができる。バルクの化学組成は、元素分析(EA)によって決定することができる。官能化した粒子の詳細なナノ結晶構造(形状、大きさ、アスペクト比)は、種々の顕微鏡技術、例えば、走査型電子顕微鏡法(SEM)、透過型電子顕微鏡法(TEM)、および原子間力顕微鏡法(AFM)に依って検討することができる。広角X線回折法(WAXD)は、結晶化度の程度を決定するために使用することができる。フーリエ変換赤外(FT−IR)分光法およびラマン分光法は、振動様式および粒子上に存在する官能基を研究するために使用することができる。動的光散乱(DLS)は、粒子の大きさを決定するために使用することができる。ζ電位測定は、表面の電荷および密度を決定するために使用することができる。熱重量分析(TGA)および示差走査熱量計(DSC)は、粒子の熱容量および熱安定性の変化を理解するために採用することができる。
実施例1:ペルフルオロアルキルジメチルクロロシランを使用したNCC表面の官能化
所望の量のナノ結晶セルロースを有する懸濁液(100gのメタノール中2mg、2重量%)を、数回の連続した遠心分離および再分散によって、アセトンに溶媒交換した後、無水トルエンに溶媒交換した。各溶媒交換工程後に超音波処理を実施した。この懸濁液を3つ首丸底フラスコに移し、アルゴンでパージした。過剰量の(ヘプタデカフルオロ−1,1,2,2−テトラヒドロデシル)ジメチルクロロシラン(Gelest社から入手可能)を、撹拌した懸濁液に滴下して添加した。シラン添加後、(イミダゾールなどの)有機アミン塩基の溶液を滴下して添加し、反応が50℃を超過しないよう反応温度を監視した。反応物を室温で16時間撹拌した。この後、改質した材料をエタノールで、各工程において1分間当たり10,000回転でおよび10℃で15分間、4回遠心分離および洗浄した。官能化したセルロースを40℃で24時間真空乾燥させた。
所望の量のナノ結晶セルロースを有する懸濁液(100gのメタノール中2mg、2重量%)を、数回の連続した遠心分離および再分散によって、アセトンに溶媒交換した後、無水トルエンに溶媒交換した。各溶媒交換工程後に超音波処理を実施した。この懸濁液を3つ首丸底フラスコに移し、過剰量の2H,2H,3H,3H−ペルフルオロウンデカン酸(SynQuest Laboratoriesから入手可能)を、撹拌した懸濁液に添加した後、触媒量のp−トルエンスルホン酸を添加した。セルロースナノ構造の表面改質を、105℃で最長24時間実施した。表面処理の後、この材料を実施例1の通り精製および乾燥させた。
実施例3:官能化したNCC/含フッ素ポリマーマスターバッチの調製
約2gの官能化したNCC(実施例1において調製)および約65gのVITON GF(E.I.du Pont de Nemours社から入手可能)を約100℃に加熱し、HAAKE PolyLab Rheomix Mixerなどの内部化合装置を1分間当たり約20回転のローター速度で約40分間使用して混合し、3重量%のナノ結晶セルロースを含有する約67gのポリマー複合体を形成した。異なる搭載量の官能化したNCCを、この押出成形降下過程によって調製した。
NCC/VITON塗装分散物を実施例3から調製した化合済みNCC/VITON材料をAO700硬化剤(N−(2−アミノエチル)−3−アミノプロピルトリメトキシシラン、United Chemical Technologies社から入手可能)またはメチルイソブチルケトン(MIBK)中の金属酸化物(酸化マグネシウムおよび/または水酸化カルシウム)およびビスフェノールVC−50硬化剤(E.I.du Pont de Nemours社から入手可能なVITON Curative No.50)のいずれかと混合することによって調製した。次に、結果として生じる塗装分散物を、プレス絞り(drawing)もしくは流し塗りのいずれか、または鋳型において鋳造することによって、好適な(例えば、アルミニウム箔または金属溶射したマイラもしくはガラス)基材に塗装した。塗装は、溶媒のほとんどを蒸着させておいた後、後硬化のために、勾配のある温度、例えば、約149℃で約2時間、および約177℃で約2時間、次に約204℃で約2時間、次に約232℃で約6時間硬化させておいた。
約0.5gの官能化NCC(実施例1において調製)および約16.5gのVITON GF(E.I.du Pont de Nemours社から入手可能)をメチルイソブチルケトン中で回転混合することによって、NCC/VITON塗装分散物を調製した。イソプロピルアルコール中のAO700硬化剤(N−(2−アミノエチル)−3−アミノプロピルトリメトキシシラン、United Chemical Technologies社から入手可能)を、混合したNCC/VITON溶液に添加した。実施例4において説明したのと同じ塗装技術および硬化過程を採用して、3重量%のナノ結晶セルロースを含有するポリマー複合体を得た。異なる搭載量の官能化したNCCを、この回転混合過程によって調製した。
Claims (10)
- ナノ結晶セルロースの外周がフッ素化基質で官能化されたフッ素官能基化ナノ結晶セルロースを形成するために前記ナノ結晶セルロースの表面をフッ素化求電子剤と反応させることと、
含フッ素ポリマー複合体を形成するためにフッ素官能基化ナノ結晶セルロースを含フッ素ポリマーと接触させることと、を含む、強化含フッ素ポリマー複合体を調製する方法。 - 前記ナノ結晶セルロースを前記フッ素化求電子剤と反応させることが、不均一条件下で生じる、請求項1に記載の方法。
- 前記ナノ結晶セルロースが、結晶構造を有する棒様の前記結晶ナノ粒子である、請求項1に記載の方法。
- 前記ナノ結晶セルロースの前記表面を前記フッ素化求電子剤と反応させることが、ナノ結晶セルロースの大きさを約5〜約10%超ほど減少させる、請求項1に記載の方法。
- 前記ナノ結晶セルロースの前記表面を前記フッ素化求電子剤と反応させることが、前記ナノ結晶セルロースの前記結晶構造が粉砕されていない表面単独フッ素官能基化ナノ結晶セルロースを形成する、請求項1に記載の方法。
- 前記ナノ結晶セルロースの表面が、ヒドロキシル、硫酸エステル、および/またはカルボン酸官能基のいずれかの組み合わせを含む、請求項1に記載の方法。
- 含フッ素ポリマー複合体を形成するために前記フッ素官能基化ナノ結晶セルロースを含フッ素ポリマーと接触させることが、凝集していない分散物を形成することを含む、請求項1に記載の方法。
- フッ素官能基化ナノ結晶セルロースを形成するために前記ナノ結晶セルロースの表面を前記フッ素化求電子剤と反応させることが、
十分に分散したNCC粒子の前記表面への可溶化したフッ素化試薬の前記均一な添加を含む、請求項1に記載の方法。 - フッ素官能基化ナノ結晶セルロースを形成するために前記ナノ結晶セルロースの表面をフッ素化求電子剤と反応させることは、
官能化したナノ結晶セルロースを精製するための遠心分離−再分散周期
を含む、請求項1に記載の方法。
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JP2014001360A (ja) * | 2012-05-25 | 2014-01-09 | Olympus Corp | エラストマー組成物および成形体 |
CN106478956A (zh) * | 2016-09-20 | 2017-03-08 | 东南大学 | 一种聚硅氧烷弹性体及其巯基‑烯点击反应制备方法 |
JP2020517801A (ja) * | 2017-04-28 | 2020-06-18 | カウンスィル オブ サイエンティフィック アンド インダストリアル リサーチCouncil Of Scientific & Industrial Research | 有機可撓性強誘電性ポリマーナノコンポジット |
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