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    题名: 聚亞醯胺-奈米無機物混成材料之製備與性質分析
    其它题名: Preparation and characterization of polyimide-inorganic nanocomposites
    作者: 張誌民;Chang, Chih-ming
    贡献者: 淡江大學化學工程與材料工程學系博士班
    張正良;Chang, Cheng-liang
    关键词: 聚亞醯胺;混成材料;二氧化鈦;奈米金;polyimide;Hybrid;titania;nano gold
    日期: 2008
    上传时间: 2010-01-11 05:40:09 (UTC+8)
    摘要: 製備高分子-無機奈米粒子混成材料的研究方面中最主要關鍵在於如何使無機奈米粒子穩定且均勻分散於高分子基材之中,特別是在高無機物含量之情況下,避免無機粒子於高分子基材中發生聚集而產生相分離的情況一直是製備混成材料的主要瓶頸。本研究中成功藉由聚亞醯胺高分子與無機粒子間形成化學鍵結增加兩相間的親和力,因此達成製備聚亞醯胺-無機物混成材料之目標。
    在聚亞醯胺-二氧化鈦混成材料的製備方面,本研究成功地藉由偶合劑在聚亞醯胺與二氧化鈦間形成鍵結,使二氧化鈦以奈米尺度均勻分散於聚亞醯胺高分子之中,並利用可溶性聚亞醯胺做為高分子基材避免鈦與聚亞醯胺高分子前驅物-聚醯胺酸之間形成螯合作用成功製備具備可調控折射率之聚亞醯胺-二氧化鈦混成薄膜。
    在聚亞醯胺-奈米金粒子混材料製備之研究中,本研究分別利用偶合劑及聚亞醯胺主鏈上之硫醇基使高分子與奈米金粒子間形成鍵結,製備具有極佳穩定性及分散性之奈米金粒子的聚亞醯胺或聚醯胺酸-奈米金混成材料。過去研究中曾提出奈米金粒子會造成混成材料熱裂解行為提前發生的現象,然而其並未探討裂解提前發生之原因,而在本研究結果中則發現,過去文獻所提及之熱裂解提前應是混材料中殘留之還原劑NaBH4所造成,並非奈米金獨特催化能力所致。此一結果代表聚亞醯胺-奈米金混成材料具備極佳之熱穩定性,使材料之應用潛力及實用價值大幅增加。
    在以具備硫醇基之聚醯胺酸及聚亞醯胺做為保護劑製備奈米金粒子之研究中顯示,用於保護奈米金粒子之聚醯胺酸或聚亞醯胺僅需要具有少量之硫醇基即可有效包覆奈米金粒子,並且所製備之奈米金粒子可穩定且均勻分散,即使經過長時間保存仍保有原先的粒徑大小。
    除了在具備硫醇基之聚亞醯胺中直接還原金鹽製備混成材料之外,本研究中所製備的具備硫醇之聚亞醯胺薄膜可使奈米金粒子固定於薄膜表面因而製得聚亞醯胺-奈米金粒子複合薄膜,使本研究所製備之聚亞醯胺高分子材料具備更多應用潛力。
    How to ensure the inorganic nanoparticles dispersed in polymer matrix uniformly and stably is a crucial point in the preparation of polymer-inorganic nanoparticle hybrids. The preparation of hybrids is limited because of the aggregation and phase separation of nanoparticles, especially in high inorganic content. In this study, the polyimide inorganic nanoparticles hybrids were prepared successfully by forming a chemical bounding between polyimide and inorganic nanoparticles which improves the affinity of these two moieties.
    In the preparation of polyimide-titania hybrids, a coupling agent provides a covalent bound between polyimide and titania successfully and improves the dispersion of titania nanoparticles in polyimide matrix. The chelate reaction of titanium during the preparation process of hybrids was avoided by employing an organic soluble polyimide, and the polyimide-titania hybrids possess a high and tunable refractive index.
    In this study, coupling agent and thiol group provide a chemical bounding to prepare polyimide-gold nanoparticles hybrids. In the recent reports, the gold nanoparticles were considered to be a catalyst enhacnement of the responsible for the degradation reaction of hybrids, but there were no solid eveidences. In this study, the different reason for the degradation were studied, and the results concluded that the degradation was caused by the residual of NaBH4.
    The poly (amic acid)-gold nanoparticles and polyimide-gold nanoparticles hybrids were prepared by the thiol-poly (amic acid) or thio-polyimide successfully. The polyimide-gold nanoparticles hybrids possess a good stability in dispersion of gold nanoparticles, and the particle sizes of gold nanoparticles in the hybrids can remain the same even redispresed in solvent.
    The thio-polyimide film was used as a substrate which can immobilize gold nanoparticles on its surface to prepare a polyimide-gold nanoparticle composite film.
    显示于类别:[化學工程與材料工程學系暨研究所] 學位論文

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