Selective Etching of Pressure-Crystallized BisphenoI-A Polycarbonate by Dimethylacetamide at Room Temperature
The high-pressure crystallized bisphenol-A polycarbonate (BAPC) and BAPC / dioctyl phthalate (DOP) blend samples were prepared in a piston-cylinder apparatus,and the recovered specimens were investigated using scanning electron microscopy (SEM).As for the fracture surfaces without etching technique applied,the detailed information of the crystal morphologies of BAPC was not shown,though the outlines of such aggregations as spherulites and cylindrulite were still exposed due to the high-temperature degradation during the long time crystallization.However,the delicate internal structures of these aggregates were revealed clearly by the introduction of a facile etching method.The used etchant,dimethylacetamide,was capable of dissolving only amorphous,but not crystalline BAPC at room temperature.With the employed selective etching technique,BAPC spherulites with fine structures and different characteristics were observed.Spatial dendrites of the polymer were also disclosed in BAPC samples plasticized with DOP after a deep etching process.Furthermore,by controlling the etching process,unique hierarchical structures,composed of nano-structured micrometer-sized crystalline entities of BAPC,was created on the fracture surfaces.The study presented here suggested that selective etching is a more effective route to reveal the inner structures of polymer crystals,as well as to fabricate new surface active materials,such as a super-hydrophobic surface with self-cleaning effect.
Bisphenol-A polycarbonatel crystal morphologyl etchingl growthl high pressure
Jun Lu Rui Huang
Key Laboratory of Advanced Technologies of Materials, Ministry of Education, School of Materials Sci College of Polymer Materials Science and Engineering, Sichuan University, Chengdu 610065, Sichuan, P
国际会议
厦门
英文
66-69
2012-01-04（万方平台首次上网日期，不代表论文的发表时间）