Title: 聚亞醯胺與黏土納米複合材料之合成與性質
Synthesis and Properties of Polyimides-Clay Nanocomposites
Authors: 劉又誠
Liu, Yau-Cheng
韋光華
Kung-Hwa Wei
材料科學與工程學系
Keywords: 聚亞醯胺;黏土;納米複合材料;有機黏土;polyimide;clay;nanocomposites;organic clay
Issue Date: 1996
Abstract: 本研究乃合成數種嶄新的聚亞醯胺/黏土納米複合材料及分析其物性。首
先使用12-aminolauric acid , 12-dodecylamine ,
1,12-diaminodedcane , 4,4-oxydianoiliane , p-phenylenediamine來
改質黏土,製備得12COOH-MONT , 12CH3-MONT , 12NH2-MONT , ODA-MONT
, PPD-MONT等有機黏土。再合成PMDA/ODA , BPDA/ODA , ODPA/ODA 等三
種聚醯胺酸。然後將有機黏土和聚醯胺酸在DMAc溶劑中混合,經加熱脫水
閉環反應後,形成聚亞醯胺/黏土複合材料。利用X-ray繞射分析鑑定是否
為納米複合材料。有機黏土中,使用芳香族夾入劑形成的芳香族有機黏土
在溶劑DMAc的分散性較脂肪族有機黏土來的好,而有機黏土在DMAc的分散
性將影響納米複合材料的形成與否。此外影響聚亞醯胺/黏土納米複合材
料形成的因素尚有:聚亞醯胺的結構、混成物厚度、聚醯胺酸與黏土的混
合時間。因為蒙特納石為矽酸鹽層所堆積而成的其結構為100nm×100nm
×1nm,所以聚亞醯胺/黏土納米複合材料能有效地改善聚亞醯胺的性質。
添加6wt﹪有機黏土所形成的聚亞醯胺/納米複合材料,其垂直於平面之熱
膨脹係數為原來純聚亞醯胺的一半。納米複合材料對於聚亞醯胺的熱穩定
性亦有些許的改進。此外,有機黏土可以降低聚醯胺酸亞醯胺化的反應溫
度。
New types of polyimides-clay composites have been synthesised.
Natural Na-montmorillonite was cation exchanged for the ammonium
cation of 12-aminolauric acid, 12-dodecylamine,
1,12-dimaninodedcane, 4,4-oxydianoiliane and p-phenylenediamine
to form organic clays. Then , PMDA-ODA , BPDA-ODA , ODPA-ODA
polyamic acids were synthesized. Organic clays and synthesized
polyamic acids in dimethylacetamide were mixed homogenerously,
and subsequently casted into films. They were subject to thermal
treatment for converting to polyimides-clay composite.
Polyimides-clay nanocomposites were confirmed by wide-angle X-
ray analysis from the disappearance of the crystal structural of
organic clay. It was found that aromatic organic clays(ODA-MONT
, PPD-MONT)were dispersed more homogenously than aliphatic
organic clays(12COOH-MONT , 12CH3-MONT , 12NH2-MONT) in DMAc
solvent. The preparation of polyimides-clay nanocomposites have
been influenced by the dispersion of organic clays in DMAc , the
structure of polyimides , the thickness of the samples and the
mixing time in DMAc.The thermal expansion coefficients in the
thickness-direction of the polyimide-clay nanocomposites films
were brought down to a half of its original value of the neat
polyimide film by the addition of 6wt﹪organic clay. Furthermore
, these polyimide-clay nanocomposites had higher thermal
stability than that of comesponding polyimides. The imidization
temperatures of these polyamic acid - clay solutions were also
reduced by the presence of these organic clays.
URI: http://140.113.39.130/cdrfb3/record/nctu/#NT850159008
http://hdl.handle.net/11536/61583
Appears in Collections:Thesis