成核剂分子构建及其对聚甲醛成核和机械性能的影响
The preparation of nucleating agent and its effect on the nucleation and mechanical properties of POM
Abstract
Preparation of nucleating agent A（MDI＋KH550）,B（MDI＋cyclohexane）,C（Polyethylene glycol (peg) grafted silica）,D（MPEG（5000）- MDI -MA）.The effect of nucleators on the crystallizing and mechanical properties of POM was investigated through FI-IR, Differential Scanning Calorimetric (DSC) and Mechanical properties Testing. The experimental results show that the nucleator A ,C,D cause POM impact resistance increased, the elongation at break increased obviously. Nucleator D:MPEG (5000)-MDI-MA modified POM elongation growth rate is 4.46%, impact performance improvement 3.767KJ/mm2. DSC test shows four kinds of nucleating agent is added to POM make crystallization temperature increased, particularly the nucleating agent D minimum undercooling is 0.42℃ lower than POM, to the first cooling crystallization nucleation beneficial grain refinement of POM, speed up the crystallization rate, so as to shorten the processing cycle, the result of the production efficiency can be improve . Comprehensive analysis showed that nucleating agent D (MPEG (5000) - MDI -MA) modified POM impact performance is best.
Keywords: polyoxymehylene；nucleator；Mechanical properties；crystallization
目 录
1 前言 1
1.1 聚甲醛POM的性能概述[1-3] 1
1.1.1 聚甲醛成核剂的作用机理 1
1.1.2 POM成核剂的分类[5~6] 2
（1）无机类成核剂 2
（2)有机类成核剂 3
（3)高分子成核剂 4
（4)复合成核剂体系 4
1.2改性聚甲醛POM成核剂国内外研究现状 4
2研究目的和意义 6
2.1 研究目的 6
2.2 研究意义 6
3实验部分 7
3.1实验原料 7
3.2实验设备 7
3.3成核剂制备原理 8
3.3.1 成核剂A 8
3.3.2成核剂B 8
3.3.3成核剂C 8
3.3.4成核剂D 10
3.4 样品制备 10
3.4.1 POM/ 成核剂A共混物的制备 10
3.4.2 POM/成核剂B共混物的制备 11
3.4.3 POM/成核剂C共混物的制备 12
3.4.4 POM／成核剂D共混物的制备 12
4结果与讨论 13
4.1成核剂D红外测试FT—IR 13
4.2改性POM力学性能测试 13
4.2.1拉伸试验 14
4.2.2 简支梁抗冲击试验 15
4.3 四种成核剂的DSC测试 16
5结论 17
致 谢 18