STUDIES ON THE DISTRIBUTION OF CARBOXYL GROUPS IN THE SOAP-FREE LATEX OF MMA-EA-AA COPOLYMER

KANG Kai; KAN Chengyou; DU Yi; LI Yuzhong; LIU Deshan

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STUDIES ON THE DISTRIBUTION OF CARBOXYL GROUPS IN THE SOAP-FREE LATEX OF MMA-EA-AA COPOLYMER

Research Article | 更新时间：2021-03-19

- STUDIES ON THE DISTRIBUTION OF CARBOXYL GROUPS IN THE SOAP-FREE LATEX OF MMA-EA-AA COPOLYMER
- Acta Polymerica Sinica Issue 5, Pages: 679-683(2004)
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- Published：20 October 2004，
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KANG Kai, KAN Chengyou, DU Yi, LI Yuzhong, LIU Deshan. STUDIES ON THE DISTRIBUTION OF CARBOXYL GROUPS IN THE SOAP-FREE LATEX OF MMA-EA-AA COPOLYMER. [J]. Acta Polymerica Sinica (5):679-683(2004)
DOI：

KANG Kai, KAN Chengyou, DU Yi, LI Yuzhong, LIU Deshan. STUDIES ON THE DISTRIBUTION OF CARBOXYL GROUPS IN THE SOAP-FREE LATEX OF MMA-EA-AA COPOLYMER. [J]. Acta Polymerica Sinica (5):679-683(2004) DOI：

摘要

用无皂乳液聚合法合成了粒径窄分布的MMA-EA-AA三元共聚胶乳

用电导滴定法测定了羧基在胶乳中的分布

系统研究了聚合体系中各组分对胶乳中羧基分布的影响 .结果表明随着NH4HCO3用量的增加

表面羧基含量(Sa)、表面羧基密度(Sd)和水相羧基含量(Fa)逐渐增大

包埋羧基含量(Ea)明显降低 ;随着AA用量的增加

Sa、Sd、Fa和Ea 均逐渐增大

但包埋羧基百分比也呈增大趋势 ;随着引发剂用量的增加

Sd和Ea 逐渐减小

而Fa 先增大然后趋于恒定.

Abstract

By using a three-step introduction of initiator at different time of polymerization

the emulsion copolymerization of methyl methacrylate(MMA)

ethyl acrylate(EA) and acrylic acid(AA) was carried out in the absence of emulsifier first at 80℃ for 7.5 h and then at 90℃ for 0.5 h．The distribution of —COOH in the latex was determined by conductometric titration

and effects of ingredients on the distribution of —COOH and the density of surface —COOH(Sd) were investigated. Results showed that N4HCO3 is a key material：with the increase of N4HCO3

the amount of surface —COOH(Sa)

water —COOH(Fa) and Sd increased

while the amount and percentage of embedded —COOH(Ea and Ep) decreased．Sa

Eaand Sd increased whereas Epdecreased with AA increase．It was found that Fa increased and then remain constant

and Sd deceased with the increase of initiator.

关键词

无皂乳液聚合丙烯酸羧基分布电导滴定甲基丙烯酸甲酯

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College of Science, Dalian Ocean University

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