采用原位无皂乳液聚合法,以丙烯酸羟乙酯(HEA)对聚氨酯预聚体(PU)进行功能化,获得乙烯基PU大分子,继而通过自由基共聚制备聚氨酯-丙烯酸酯微乳液(APUA);并将其应用于纸张表面改性.FT-IR证实了乙烯基PU与聚丙烯酸酯(PA)间的共聚反应;TGA亦说明PA的引入延缓了聚合物的分解.随着HEA用量的增加,APUA粒径由63.33nm下降至22.54nm;透射电镜图亦表明,未经HEA改性的APUA乳胶粒大小不均;经4％(质量分数)的HEA改性后,APUA呈现核壳结构,粒径分布相对均一.但随着PA含量的增加,乳液粒径增加,壳层PU胶粒中同时包裹多个PA胶粒.纸张性能测试表明,当体系m(2,2-二羟甲基丁酸)＝10％,m(HEA) =4％％0,n(NCO)/n (OH)=1.6,m(PA) =35％时,以7％(质量分数)的APUA对纸张进行表面改性,纸张耐折度增加.扫描电镜亦表明改性后的纸纤维表面裂纹和缺陷明显减少,可有效改善其强度.
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