论文总字数：17353字

摘 要

PETG共聚酯是一种新型的共聚酯，有巨大的应用市场。本文探索了以精对苯二甲酸（PTA）、乙二醇（EG）和1,4-环己烷二甲醇（CHDM）为原料合成PETG的工艺路线，并考虑了温度和稳定剂对CHDM在聚合过程的稳定化影响。其稳定化以端羧基浓度来表征。实验发现，当反应聚合温度在270-280℃，不添加稳定剂的时候，PETG的特性粘度大且端羧基浓度小，所得产物的透明度较好，拉伸强度较高断裂伸长率较低，CHDM的稳定性最好。

关键词：1,4-环己烷二甲醇 PETG 聚合 稳定化

Study on the stabilization of CHDM during the polymerization of PETG

Abstract

PETG is a new copolyester with a huge application market. This article explores the process route with purified terephthalic acid (PTA), ethylene glycol (EG) and 1,4-cyclohexanedimethanol (CHDM) .Considering the influence of temperature and stabilizers on the stabilization of CHDM in polymerization. Using terminal carboxyl group concentration to characterize the stabilization. It was found that when the reaction polymerization temperature at 270-280 ℃, without stabilizer , the intrinsic viscosity of PETG is large, terminal carboxyl group concentration is small, the transparency of product is better, tensile strength is high and breaking elongation is low, the stabilization of CHDM is best.

Key Words: 1,4 - dimethyl cyclohexane;PETG; polymerization; stabilization

目 录

摘 要 --------------------------------------------------------------------------I

Abstract -------------------------------------------------------------------------II

第一章 前言-----------------------------------------------------------------------2

1.1 PETG的介绍--------------------------------------------------------------------------------2

1.1.1 PETG的定------------------------------------------------------------------------------2

1.1.2 PETG的性能 ----------------------------------------------------------------------3

1.1.3 PETG的应用 ----------------------------------------------------------------------4

1.2CHDM的介绍-------------------------------------------------------------------------------4

1.2.1CHDM的主要特性--------------------------------------------------------------------5

1.2.2CHDM的用途--------------------------------------------------------------------------6

1.2.3CHDM的制备--------------------------------------------------------------------------7

1.3 国内外的研究现状-------------------------------------------------------------------------7

1.4 研究路线及方法----------------------------------------------------------------------------8

1.4.1 PETG的合成路线---------------------------------------------------------------------8

1.4.2 PETG合成工艺------------------------------------------------------------------------9

1.4.3 实施方法 ----------------------------------------------------------------------------9

1.4.4CHDM稳定化的表征----------------------------------------------------------------10

第二章 实验部分 -----------------------------------------------------------11

2.1实验配比------------------------------------------------------------------------------------11

2.2仪器设备------------------------------------------------------------------------------------11

2.3实验步骤------------------------------------------------------------------------------------12

2.4 PETG的性能测定和CHDM的稳定化表征-------------------------------13

2.4.1 PETG特性粘度的测定----------------------------------------13

2.4.2 PETG透光率的测定------------------------------------------14

2.4.3 PETG力学性能的测定----------------------------------------15

2.4.4 CHDM稳定化的表征------------------------------------------15

第三章 结果与讨论------------------------------------------------------------17

3.1反应过程中电机电流的变化-----------------------------------------------------------17

3.2特性粘度-----------------------------------------------------------------------------------20

3.3透光率--------------------------------------------------------------------------------------21

3.4 力学性能----------------------------------------------------------------------------------23

3.5 CHDM稳定化的表征-端羧基浓度---------------------------------------------------25

第四章 结论 -------------------------------------------------------------------26

参考文献 ------------------------------------------------------------------------27

致谢-------------------------------------------------------------------------------29

1. 前言

1.1 PETG的介绍

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