Investigation on Properties of PMMA/SiPUA Latexes with“Salami”Structural Particles and Their Coating Films

Jing Sun; Hai-li Wang; Yu-qiu Ding; Hua-gao Fang; Shan-zhong Yang; Yun-sheng Ding

doi:10.11777/j.issn1000-3304.2016.16064

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Investigation on Properties of PMMA/SiPUA Latexes with“Salami”Structural Particles and Their Coating Films

Research Article | 更新时间：2021-03-19

- Investigation on Properties of PMMA/SiPUA Latexes with“Salami”Structural Particles and Their Coating Films
- Acta Polymerica Sinica Issue 11, Pages: 1572-1578(2016)
- 作者机构：
  
  1.合肥工业大学化学与化工学院合肥 230009
  2.先进功能材料与器件安徽省重点实验室合肥 230009
- 作者简介：
- 基金信息：
- DOI：10.11777/j.issn1000-3304.2016.16064
  CLC：
- Published：2016-11，
  
  Received：1 March 2016，
  
  Revised：5 April 2016，
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Jing Sun, Hai-li Wang, Yu-qiu Ding, Hua-gao Fang, Shan-zhong Yang, Yun-sheng Ding. Investigation on Properties of PMMA/SiPUA Latexes with“Salami”Structural Particles and Their Coating Films. [J]. Acta Polymerica Sinica (11):1572-1578(2016)
DOI：

Jing Sun, Hai-li Wang, Yu-qiu Ding, Hua-gao Fang, Shan-zhong Yang, Yun-sheng Ding. Investigation on Properties of PMMA/SiPUA Latexes with“Salami”Structural Particles and Their Coating Films. [J]. Acta Polymerica Sinica (11):1572-1578(2016) DOI： 10.11777/j.issn1000-3304.2016.16064.

摘要

采用两步法，先以六亚甲基二异氰酸酯(HDI)、聚醚二元醇(N210)、端羟丙基硅油(HPMS)、端羟基丙烯酸树脂(PA-OH)为主要原料，合成了含硅聚氨酯-丙烯酸酯(SiPUA)种子乳液，然后在SiPUA乳胶粒内引入甲基丙烯酸甲酯(MMA)，通过原位自由基共聚合，构筑了以SiPUA为壳，聚甲基丙烯酸甲酯(PMMA)为多核的“Salami”结构乳胶粒(PMMA/SiPUA).FTIR和DSC测试表明，聚氨酯、有机硅与丙烯酸酯发生反应，并确认了PMMA的生成；TEM结果显示，PMMA/SiPUA乳胶粒子具有“Salami”结构；随着SiPUA中HPMS含量的增加，PMMA/SiPUA乳胶粒子的粒径先增加后减小，粒径分布则从单峰窄分布变化到双峰宽分布，其乳液涂膜的水接触角呈现先增加后减小的趋势，但膜的吸水率则逐渐减小；与SiPUA相比，PMMA/SiPUA涂膜的透明性有一定下降，相分离程度增加；动态流变测试显示，PMMA/SiPUA涂膜中PMMA的存在，提高了其模量和黏度.当SiPUA中HPMS含量为10 wt%，核/壳质量比

(PMMA)/

(SiPUA)=0.5时，PMMA/SiPUA乳液的粒径较小，且为单峰分布，其涂膜的耐水性和耐高温性能较好.

Abstract

A series of waterborne latexes with hybrid particles composed of poly(methyl methacrylate) and silicone-containing polyurethane acrylate (PMMA/SiPUA) were successfully prepared

via

a two-step procedure.Waterborne SiPUA latexes were firstly synthesized to serve as seeds

and methyl methacrylate (MMA) was then introduced into SiPUA latexes to form polymeric cores by

in situ

radical polymerization.The results of Fourier transform infrared spectrometry (FTIR) and differential scanning calorimeter (DSC) confirm the polymerization of MMA occurred inside SiPUA latex particles.Transmission electron microscopy (TEM) observation showed "Salami" morphology in the hybrid latex particles

where PMMA and SiPUA acted as the dispersed core and the outer continuous shell

respectively.With increased HPMS content in the latex of SiPUA

the average size of latex particles of PMMA/SiPUA increased at first and then decreased.Meanwhile

the particle size distribution changed from a narrow unimodal to a wide bimodal distribution.The surface water contact angle of PMMA/SiPUA coating films was found to increase first and then to decrease with increasing HPMS in SiPUA

however

the water absorption of PMMA/SiPUA films showed monotonic decrease with increasing HPMS in SiPUA.Atom force microscopy (AFM) reveals that the surface roughness changes little with the presence of HPMS.With introduction of PMMA in the modified PU

phase separation occurred

which led to the reduction of transparency in PMMA/SiPUA latex films.Rheological measurement of PMMA/SiPUA latexes demonstrated the reinforcement effect of PMMA to their films

showing increased modulus and viscosity.When the mass ratio of PMMA/SiPUA and HPMS content in SiPUA were 0.5 wt% and 10 wt%

respectively

the average particle size of PMMA/SiPUA latex reached a minimum

and the size distribution exhibited a narrow unimodal distribution.Therefore

introduction of PMMA into SiPUA

leading to the formation of "Salami" structure in the latex particles

not only retained good physical and chemical properties of SiPUA

but also improved their thermal resistance.

关键词

含硅聚氨酯端羟基丙烯酸酯聚甲基丙烯酸甲酯"Salami"结构膜性能

Keywords

Silicon-containing polyurethaneTerminal hydroxyl acrylatePMMA"Salami" structureFilm properties

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