DFMA改性丙烯酸乳液压敏胶的合成及其表征毕业论文_化学工程与工艺毕业论文

DFMA改性丙烯酸乳液压敏胶的合成及其表征毕业论文

2021-04-28更新

摘 要

本文通过单体饥饿种子半连续乳液聚合工艺,以丙烯酸酯类单体为原料,过硫酸铵为引发剂,加入甲基丙烯酸十二氟庚酯(DFMA)单体合成了含氟丙烯酸乳液 PSA,探讨了甲基丙烯酸十二氟庚酯(DFMA)对 PSA 的耐水性,热稳定性、以及玻璃化转变温度的影响。PSA的化学结构以及表面性能用FTIR和XPS 分别进行了表征。最后用原子力显微镜AFM探讨了DFMA对丙烯酸酯乳液压敏胶胶膜表面粗糙度的影响。

结果发现:IR谱图分析表明甲基丙烯酸十二氟庚酯DFMA通过乳液聚合方式成功引入到乳胶粒子中。伴随着DFMA的引入及其用量不断增大,PSA的Tg、热稳定性和表面粗糙程度也明显得到了提高,PSA的水接触角大幅度增加,耐水性提高。

关键词:丙烯酸;乳液聚合;压敏胶;甲基丙烯酸十二氟庚酯

Synthesis and Characterization of DFMA Modified Acrylic Emulsion Pressure Sensitive Adhesive

ABSTRACT

In this paper, a semi-continuous emulsion polymerization process of monomeric starvation seeds was carried out, and a fluorinated acrylate emulsion PSA was synthesized by using an acrylate monomer as a raw material, ammonium persulfate as an initiator, and a dodecafluoroheptyl methacrylate (DFMA) monomer. The effects of dodecafluoroheptyl methacrylate (DFMA) on the water resistance, thermal stability and mechanical properties of PSA were investigated. The chemical structure and surface properties of PSA were characterized by FTIR and XPS, respectively. Finally, the effect of DFMA on the surface roughness of acrylate emulsion pressure sensitive adhesive film was investigated by atomic force microscope (AFM).

It was found that IR spectrum analysis showed that DFMA was successfully introduced into the latex particles by emulsion polymerization. With the introduction of DFMA and its increasing dosage, the Tg, thermal stability and surface roughness of PSA are also obviously improved. The water contact angle of PSA is greatly increased and the water resistance is improved.

Key words:acrylate;emulsion polymerization;PSA;DFMA

目 录

1 前言………………………………………………………………1

1.1 概述……………………………………………………….1

1.1.1 分类…………………………………………………..1

1.1.2 压敏胶的黏附特性………………………………………..2

1.1.3 压敏胶的应用范围及特点…………………………………..3

1.2 乳液型丙烯酸酯压敏胶…………………………………………3

1.2.1 组成…………………………………………………..3

1.2.1.1 分散介质………………………………………….3

1.2.1.2 单体……………………………………………..3

1.2.1.3 乳化剂……………………………………………4

1.2.1.4 引发剂……………………………………………5

1.2.1.5 分子量调节剂………………………………………5

1.2.2 乳液聚合……………………………………………….6

1.2.2.1 聚合机理………………………………………….6

1.2.2.2 聚合过程………………………………………….6

1.2.2.3 乳液聚合的特点…………………………………….7

1.2.2.4 乳液聚合的应用与新发展……………………………..7

1.3 丙烯酸乳液的改性……………………………………………..8

1.3.1 有机氟改性…………………………………………….8

1.3.2 有机硅改性…………………………………………….8

1.3.3 聚氨酯改性…………………………………………..9

1.3.4 纳米材料的改性………………………………………9

1.4 本文的研究背景,研究意义和研究内容…………………………….9

1.4.1 本文的研究背景和研究意义………………………………..9

1.4.2 本文的研究内容……………………………………..10

2 实验部分………………………………………………………….11

2.1 原料……………………………………………………….11

2.2 仪器……………………………………………………….11

2.3 丙烯酸乳液压敏胶的制备………………………………………12

2.3.1 乳液的合成……………………………………………12

2.3.2 胶带的制备……………………………………………12

2.4 测试与表征…………………………………………………13

2.4.1 红外光谱(IR)分析…………………………………….13

2.4.2 玻璃化转变温度Tg…………………………………..13

2.4.3 热重分析TG…………………………………………..13

2.4.4 XPS测试……………………………………..13

2.4.5 接触角测试………………………………………….13

2.4.6 AFM测试…………………………………………….13

3 结论……………………………………………………………..15

3.1 红外光谱(IR)分析………………………………………….15

3.2 玻璃化转变温度Tg分析……………………………………….15

3.3 热重分析TG………………………………………………..16

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