聚乳酸(Polylactide，PLA)是一種直鏈型的脂肪族熱塑性聚酯，且由於
它的生物可分解能力及對待環境的親和性，從20世紀70年代起就已經獲得很
多人注意了。因為聚乳酸是由玉米澱粉透過發酵而成，所以它被視為一種可
再生資源。但它的機械物理性質的脆弱和較低的結晶率是目前很多在應用上
的主要缺點。為了改進這樣的特性，大多用PLA 的可生物分解特性，去複合
非可生物分解的高分子聚合物來改善其主要缺點，一般常見使用PLA與奈米黏
土的結合，二氧化矽的複合材料通常以溶膠-凝膠法製備，該法提供了一陶瓷
原料加工路線來製備高純度的奈米複合黏土微米結構，而且其奈米複合材料
可依複合材料的奈米尺寸及種類等級來增強其表面積、熱裂解穩定性、融化
結晶行為等。在本論文中所使用來製備PLA/SiO2 奈米複合材料的溶膠-凝膠方
式也可提供為有機聚合物聯結的原料。一般來說溶膠-凝膠過程包含兩個步驟
所組成，即金屬烷氧化物的水解和水解後產物的聚縮作用
(polycondensation)，文獻中記載奈米尺寸的膠體溶液也曾被應用於
epoxy/SiO2 和PI/SiO2 的製備。本論文所採用的溶膠-凝膠法製程作為
PLA/SiO2複合材料的配製，並使用商品化的silica sol與PLA複合，並觀察 SiO2
的分散情形，和在經過水解作用前後，PLA/SiO2複合材料對機械性質與熱穩定
性的影響與改變，並以裂解活化能(Ea)的值探討熔點與結晶的情形。

Polylactide (PLA) is linear aliphatic thermoplastic polyester
and it has obtained much attention since 1970s due to its
biodegradability and friendliness for environment. It is seen as a
renewable resource since it is prepared from starch via fermentation.
However, its brittleness1 and low crystallization rate2 are major
drawback for its applications. In order to improve such properties,
PLA had blended with biodegradable3-5and non-biodegradable
polymers.6-12 Nanocomposites are a class of composites in which the
reinforcing phase dimensions are in the order of nanometers. The
thermal stability, melt behavior, mechanic properties of PLA are
improved by incorporation of nanoclay particles into PLA.13-16 SiO2
nanocomposites are usually prepared by applying sol-gel process
which provides a chemical route to ceramics of high purity，
controlled microstructure; the sol-gel technique also allows couple
with organic polymeric materials.17-18 The sol-gel process consists
of two stages, hydrolysis of a metal alkoxide and polycondensation
of the hydrolysis products .
Nanoscale colloidal silica sol has been used in preparation of
7
epoxy/SiO2 19
and Polyimide/ SiO2 20In this study，PLA/SiO2 composites
are prepared by sol-gel process and blending with commercial silica
sol. The dispersion of SiO2 and its effect on the mechanical and
thermal stability before and after hydrolytic aging were
observed .The values of apparent decomposition activation energies
(Ea) were employed as a way to evaluate the kinetic .

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