【作者】 顾继友； 张霄； 娄春华； 白龙； 李志国；

【Author】 Ji-you Gu;Xiao Zhang;Chun-hua Lou;Long Bai;Zhi-guo Li;College of Material Science and Engineering.Key Laboratory of Bio-Based Material Science and Technology,Northeast Forestry University;College of Materials Science and Engineering of Qiqihar University;

【机构】 东北林业大学材料科学与工程学院； 齐齐哈尔大学材料与工程学院；

【摘要】 本文以亲水性的聚醋酸乙烯酯(PVAc)为核,疏水性的聚苯乙烯(PSt)为壳,并通过第三单体——马来酸酐(MA)的接枝作用,旨在成功构建出一种核壳型的高耐水性PVAc/PSt复合乳液。将亲水性好的PVAc基聚合物用疏水性好的PSt基聚合物保护起来,从而提高PVAc乳液的耐水热性能。通过考察MA含量和核壳比对粒子形貌的影响,发现在单因素条件下,二者都能驱使乳胶粒的形貌发生一定程度的衍化,对乳胶粒的形貌构建起决定性作用。通过调整体系酸碱性,发现在pH值为3.1左右时,体系胶接性能最佳。最后,通过耐沸水实验,说明在核壳比及固含量不变的情况下,MA含量为0.8%左右时,复合乳液的耐沸水性能最佳,其耐沸水性能远远大于相同固含量下纯PVAc乳液。最后,依据实验结论,进一步探讨了乳胶粒的形成机制问题。更多还原

【Abstract】 In this paper,PVAc-based core/shell structural emulsion with high water resistance was designed and prepared using PVAc polymer as core and PSt polymer as shell and MA as Third grafted-monomer.In this approach,the hydrophilic PVAc core was protected by PSt-based polymer to improve the water resistance of PVAc polymer.The MA content and core/shell ratio were investigated and found that under the single factor(MA content or core/shell ratio)experimental condition,the morphology of PVAc/PSt latex particle was depended on the single factor,and the latex morphology had a regular evolution with the gradual changing of MA content or core/shell ratio.When the pH value of the emulsion system was about 3.1,mechanical property of the composite emulsion was optimal.Finally,the boiling water-resistance of this emulsion was investigated,finding that when the MA content was about 0.8%under the conditions that the core/shell ratio and solid content was constant,the boiling water-resistance of PVAc/PSt composite emulsion was optimal,and the water-resistance of the composite emulsion distinctly overmatched the pure PVAc emulsion under the same solid content.Finally,based on the experimental results,the formation mechanism of PVAc/PSt structural latex particle was further considered.更多还原