长链聚硅氧烷接枝（甲基）丙烯酸酯聚合物乳液的制备及其性能

该文首先合成了聚硅氧烷阴离子乳液和链中含硅烷偶联剂的（甲基）丙烯酸酯聚合物乳液两种不同的乳液，然后通过乳液接枝共聚的方法，利用硅烷偶联剂水解基团与聚硅氧烷正离子之间的反应合成了一种高硅含量的硅丙聚合物乳液。测试结果表明，有机硅质量分数为20％的聚合物乳液涂膜性能最佳，与不含有机硅的聚合物乳液涂膜相比，其水表面接触角由 77.5。增加到95。，24小时吸水率由4.9％下降到2.3％，耐水性大大增加，同时玻璃化转变温度由8.53℃下降到-1.36℃，聚合物分子链的柔顺性有所提高，说明此方法合成的高硅含量硅丙乳液涂膜可作为一类具有优良耐水性及良好的表面疏水性的功能材料得以应用。

SYNTHESIS OF THE POLYACRYLATE LATEX MODIFIED BY LONG CHAIN BRANCHED POLYSILOXANE AND STUDY OF ITS PROPERTY

In this paper,polysiloxane anionic emulsion and polyacrylate latex containing silane coupling agent were first prepared.Then a high organosilicon content silicone-modified polyacrylic emulsion was synthesized by hydroxyl condensation reaction.The results show that,when the mass fraction of silicone was 20%,the polymer emulsion film was of best performance.Compared with the polyacrylate latex film,the contact angle of silicone-acrylic emulsion film changed from 77.5° to 95°.Its water absorption within 24 h decreased from 4.9% to 2.3%,and its hydrophobic property was significantly improved.Furthermore,its Tg decreased from 8.53 ℃ to-1.36 ℃,and the compliance of polymer chain was improved.The silicone-acrylic emulsion of high organosilicon content can be used as a kind of hydrophobic functional polymeric material.