臺灣博碩士論文加值系統

摘 要
本文利用兩種方法去合成一系列的聚乙二醇(polyethylene glycol,PEG)
與聚苯乙烯(polystyrene,PS)的團鏈共聚合物(block copolymers)：其
一(iniferter)、其二(macroinitiator)。其中聚乙二醇分子量分別為400
、2000、4000。 藉由元素分析儀(
Elemental Analyzer,EA)測定本文合成的一些中間產物組成，經由水解反
應，以凝膠滲透層析儀（Gel permeation chromatography,GPC)決定PS團
鏈分子量，配合元素分析結果計算出PS重量百分比介於34∼89%，而團鏈
重複單位介於9.2∼2.1之間。以傅利葉紅外線光譜分析儀(Fourier
Transform Infrared Spectrophotometer,FTIR)來鑑定其結構，在1110
㎝-1有PEG醚基的吸收峰。經由微分掃瞄卡計(Differential Scanning
Calorimeter,DSC)的熱行為得知PS與PEG有相分離的情況，而由不同軟硬
團鏈組成關係可解釋相分離的程度。進一步以電子穿透掃瞄顯微鏡(
Transmission Electron Microscope,TEM)觀察其微相分離型態，得到棒
狀（rod）及胞囊狀（vesicle）的PEG相分散在球狀（sphere）的PS相中
，以實驗結果並配合分子模擬來探討組成與相區之間的關係。

Abstract
We attempted to synthesize a series block copolymers of
Polystyrene-(Polyethylene glycol) by two methods：One is
iniferter system and the other is macroazoinitiator system.
Block copolymers involved different PEG''s molecular weights
,600、2000、4000, in the polymer chains.
The prepared polymers thus contained 34∼89 wt% of PS hard
segments obtaining from elemental analysis (EA). Gel permeation
chromatography (GPC) was used to determine the average molecular
weight of PS segments after hydrolysis. The polymers showed an
absorbance at 1110㎝-1 corresponding to the ether groups in PEG
segments by Fourier transform infrared Spectrophotometer (FTIR).
From the thermal properties of the block copolymers studied by
differential scanning calorimeter (DSC) , we knew that PS and
PEG blocks existe two phases. Therefore , some investigations
regarding the compositions dependent of the PS blocks was
studied. In order to understand the shapes and sizes of
microdomains , we took some pictures from transmission electron
microscope (TEM) and got three microphases ：one was rodlike
domain of PEG； another was PEG vesicles；the rest was spherical
PS domains. At the last , we compared the sizes of microdomain
from the pictures with the help of molecular structure modeling
.