文献类型：期刊文献

英文题名：Vinyl Ester Oligomer Crosslinked Porous Polymers Prepared via Surfactant-Free High Internal Phase Emulsions

作者：Zhu, Yun[1];Hua, Ye[1];Zhang, Shengmiao[1];Chen, Jianding[1];Hu, Chun Pu[1]

机构：[1]E China Univ Sci & Technol, Shanghai Key Lab Adv Polymer Mat, Key Lab Ultrafine Mat, Minist Educ,Sch Mat Sci & Engn, Shanghai 200237, Peoples R China

年份：2012

卷号：2012

外文期刊名：JOURNAL OF NANOMATERIALS

收录：;EI(收录号：20122515134661);WOS:【SCI-EXPANDED(收录号:WOS:000304970200001)】；

基金：This research was supported by the National Natural Scientific Foundation of China (51103042), the Fundamental Research Funds for the Central Universities, Innovation Program of Shanghai Municipal Education Commission (12ZZ056), Shanghai Leading Academic Discipline Project (Project no. B502), and Shanghai Key Laboratory Project (08DZ2230500).

语种：英文

外文关键词：Volume fraction - Elastic moduli - Esters - Acrylic monomers - Oligomers

摘要：Using vinyl ester resin (VER) containing styrene (or methyl methacrylate) and vinyl ester oligomer (VEO) as external phase, Pickering high internal phase emulsions (Pickering HIPEs) having internal phase volume fraction of up to 95 vol% were prepared with copolymer particles as sole stabilizer. Polymerizing the external phase of these Pickering HIPEs led to porous polymers (poly-Pickering-HIPEs). Compared to the polystyrene-(PS-) based poly-Pickering-HIPEs which were prepared with mixture of styrene and divinylbenzene (DVB) as crosslinker, the poly-Pickering-HIPEs herein showed much higher elastic modulus and toughness. The elastic modulus of these poly-Pickering-HIPEs increased with increasing the VEO concentration in the external phase, while it decreased with increasing internal phase volume fraction. Increasing VEO concentration in the external phase also resulted in a decrease in the average void diameter as well as a narrow void diameter distribution of the resulting poly-Pickering-HIPEs. In addition, there were many small pores in the voids surface caused by the volume contraction of VER during the polymerization, which suggests a new method to fabricate porous polymers having a well-defined hierarchical pore structure.