超临界CO_2作用下双酚A型聚碳酸酯的诱导结晶和熔融行为  

Effect of Supercritical CO_2 on Induced Crystallization and Melting Behavior of Bisphenol-A Polycarbonate

作　　者：丁晓娟[1] 丁一刚[1] 周春平[1] 胡雄[1] 谭涛[1] 

机构地区：[1]武汉工程大学湖北省新型反应器与绿色化学工艺重点实验室,湖北武汉430074

出　　处：《塑料工业》2008年第B06期162-164,169,共4页China Plastics Industry

基　　金：湖北省教育厅重点项目资助(项目编号2003B002)

摘　　要：采用差示扫描量热法(DSC)研究了在超临界CO_2作用下,温度、压力和共溶剂对双酚A型聚碳酸酯(BAPC)的结晶和熔融行为的影响。结果表明,超临界CO_2能使双酚A型聚碳酸酯(BAPC)在其玻璃化转变温度下结晶。CO_2是非极性流体,加入共溶剂能增加超临界流体的极性,或是与溶质形成氢键,从而大大提高流体的溶解能力。少量共溶剂的加入使BAPC的结晶更加完善,并能使其在更低的温度和压力条件下结晶。The influences of temperature, pressure and cosolvent on the crystallization and melting behavior of bisphenol-A polycarbonate （BAPC） treated by supercritical CO2 were studied by means of DSC. The results showed supercritical CO2 depressed the crystallization temperature of BAPC and induced crystallization below the glass transition temperature. CO2 had no dipole moment and only a small quadrupole moment and, therefore, was essentially a nonpolar fluid. The addition of a small amount of a polar cosolvent was equivalent to giving the mixed fluid an overall small dipole moment, or come into being hydrogenolysis with solute. Similar annealing condition in the presence of supercritical CO2 ＋ cosolvent led to more stable crystals. The addition of a small amount of cosolvent could induce crystallization at much lower temperature and pressure.

关 键 词：超临界CO2 诱导结晶 双酚A型聚碳酸酯 共溶剂 

分 类 号：TQ323.4[化学工程—合成树脂塑料工业]