交联聚醚聚氨酯的表征及其聚集态转变和自由体积特性的正电子湮没研究  

Characterization of Crosslinked Poly (ether urethane)and Study of Its Transitions and Free-Volume Properties with Positron Annihilation

作　　者：刘皓[1] 过俊石[1] 谢洪泉[1] 王波[1] 李世清[1] 王少阶[1] 

机构地区：[1]华中理工大学化学系,武汉大学物理系

出　　处：《高等学校化学学报》1994年第4期603-607,共5页Chemical Journal of Chinese Universities

基　　金：国家自然科学基金

摘　　要：采用全反射红外光谱（ＡＴＲ－ＩＲ）对聚合物的结构进行了表征，证明其为交联聚醚聚氨酯（ＰＥＵ），且其碱金属盐络合物的导电性与其自由体积有关。在１１０～３５０Ｋ温度范围内测量了ＰＥＵ的正电子湮没寿命谱，结果表明正电子湮没寿命谱的温度关系可灵敏地反映聚合物的聚集态转变及其自由体积特性随温度的变化。得到了ＰＥＵ的次级转变、玻璃化转变及结晶相的熔融变化等方面的信息。并由实验测得的ｏ－Ｐｓ寿命计算出不同温度下ＰＥＵ中自由体积孔洞的尺寸。The structure of crosslinked poly(ether urethane)was characterized by ATR-IR,and its conductivity of the polymer complex with LiClO4 is in close relationship with free-volume of the polymer, In the temperature range from 110─350K, lifetime spectra of positron annihilation in PEU have been measured. The result shows that positron lifetime is sensitive to the transitions and free-volume holes in the polymer. From lifetime spectra we get the informations of secondary transition, glass transition and crystal melting transition. The temperature dependences of the size of free-volume in PEU are calculated from the o-Ps annihilation lifetime.

关 键 词：正电子湮没 聚醚聚氨酯 聚集态 

分 类 号：O633.21[理学—高分子化学]