互穿网络聚合物的自由体积特性

互穿网络聚合物的自由体积特性 Free Volume Properties of Interpenetrating Polymer Networks Probed by Positron Annihilation 何春清 1 2 first-author 戴益群 1 2 张少平 1 2 王波武 1 2 王少阶 1 2 王贵友 1 2 胡春圃 1 2 武汉大学物理学系,武汉,430072 武汉大学物理学系,武汉,430072 Institute of Material Science and Engineering,East China University of Science and Technology,Shang Institute of Material Science and Engineering,East China University of Science and Technology,Shang 华东理工大学材料科学与工程研究所,上海,200237 华东理工大学材料科学与工程研究所,上海,200237 测量了不同组分比的聚氨酯／丙烯酸酯类树脂（ＰＵ／ＶＥＲＨ）的化学计量和化学不计量同时互穿网络聚合物 ＳＩＮｓ（Ｓｉｍｕｌｔａｎｅｏｕｓ ｉｎｔｅｒｐｅｎｅｔｒａｔｉｎｇ ｐｏｌｙｍｅｒ ｎｅｔｗｏｒｋｓ）的正电子湮没寿命参数．研究结果表明两种 ＳＩＮｓ随组分变化存在相转变过程；而且化学计量 ＰＵ／ＶＥＲＨ ＳＩＮ两组分间存在的较强化学键作用减小ＳＩＮｓ平均自由体积孔洞尺寸，分子链段堆砌紧密，分子链段间相互作用增强，从而增强了互穿效果、极大地改善了ＳＩＮｓ两组分之间的相溶性，从微观上改善了互穿网络聚合物的力学性能，为分子水平设计新型材料提供了实验依据． Positron annihilation lifetime（PAL） spectroscopy was applied to investigate the free volume properties of two types of simultaneous interpenetrating polymer networks （SINs）, stoichiometric SINs and non-stoichiometric SINs. PU/VER SINs are all composed of polyurethane（PU） and vinyl ester resin （VER）with different compositions. Mean free volume size in PU/VER deceased with the increase of VER weight percentage, and the relative intensity, relevant to free volume content, increased with VER contents. The effect of chemical bonds between PU networks and VER networks to free volume properties was observed. Results revealed that chemical bonds between the two networks led to molecular denser packing, free volume contraction and made stoichoimetric PU/VER SINs a miscible system. 互穿网络聚合物 自由体积 正电子湮没 10.14188/j.1671-8836.2000.01.017 O631 国家自然科学基金!（29674020） 2000-01-01 2021-04-01 1