中文摘要：

以原位无皂乳液聚合法,异佛尔酮二异氰酸酯（IPDI）、聚己内酯多元醇（PCL）、二羟甲基丁酸（DMBA）、丙烯酸羟乙酯（HEA）、苯乙烯（St）、丙烯酸丁酯（BA）等为主要原料,制备聚氨酯/丙烯酸酯微乳液（PUA）,并研究微乳液对纸张疏水性影响。研究表明当m（DMBA）=8%,m（HEA）=4%,n（NCO）/n（OH）=1.6,m（PU）/m（PA）=1∶1时,经PUA微乳液表面处理后,纸张于水的渗透时间较空白纸样提高了73%,明显改善纸张的疏水性。采用FT-IR、TGA、SEM及动态接触角对PUA结构以及表面处理前后纸张性能变化进行了表征。FT-IR和TGA均证实丙烯酸酯组分的引入获得了聚氨酯/丙烯酸酯的复合结构,且聚合物热稳定性较PU明显提高;SEM观察证实,经PUA微乳液处理后纸纤维表面变得光滑,裂纹明显减少;动态接触角分析表明,水在纸表面所成的初始接触角达118°,且在300s内,其随时间变化较小。

英文摘要：

A facile route to prepare polyurethane/polyacrylate microemulsion（PUA） by in-situ surfactant-free emulsion polymerization was proposed,and PUA were synthesized by reacting isophorone diamine（IPDI）,polycaprolactonediols（PCL）,dimenthylol butanoic acid（DMBA）,hydroxyethyl acrylate（HEA）,styrene（St） and butyl acryolate（BA）.The factors affecting its synthetic condition were discussed,and the synthetic process was optimized.The results show that the microemulsions owns excellent sizing property when m（DMBA）=8%,m（HEA）=4%,n（NCO）/n（OH）=1.6,m（PU）/ m（PA）=1∶1 and with 7% polymer microemulsion addition.The waterproof properties of paper with treatment increased by 73%.Finally,the polymer was characterized with Fourier transform infrared spectra（FT-IR）,thermogravimetry（TGA）,scanning electron microscope（SEM）,and dynamic contact angle.FT-IR and TGA demonstrated the PUA was obtained,and PUA has good thermal stability.SEM photographs further certified that the cracks and defects on the fibers were apparently reduced.Dynamic contact angle measurement confirmed the water contact angle was 118°and the angle almost keep unchanged within 300s.