废醋酸纤维再生香烟嘴纤维

本研究将废醋酸纤维(CA)溶解在丙酮及助剂中,溶液经过过滤、脱泡,并进行干平式纺丝,制成香烟嘴纤维半制品。实验研究结果表明,废CA再生嘴纤维的性能良好,在本实验范围内,原液中废CA的浓度可达35％以上,溶液不糊板,引丝容易,成型过程连续稳定,纺丝速度可达1000米/分以上,技术可行,再生嘴纤维的物理指标基本符合嘴纤维半制品要求。

废醋酸纤维素丙酮溶液的流变性和可纺性研究

用旋转粘度计研究了废醋酸纤维素(WCA)丙酮溶液的流变性质,考察了溶液对切变速率,增塑剂含量、浓度和温度的依赖关系,并对可纺性进行了研究。研究结果表明,WCA丙酮溶液的粘弹性低于CA丙酮溶液;WCA丙酮溶液的可纺性良好。

废醋纤（WCA）再生香烟嘴纤维研究——（Ⅲ）再生CA纤维的结构性能

用扫描量热（dcs），X射线衍射和电子显微镜等方法，研究了含有增塑剂的再生二醛酸纤维素（CA）的热性能、结晶结构、表面结构和纤维的物理机械性能。研究结果表明，增塑剂与CA是相溶均相，CA的葡萄构象能、玻璃化温度、结晶温度、纤维物性随着增塑剂含量增加而下降，但对结晶结构影响甚微，再生CA纤维的面与商品CA纤维一样光滑，经处理可得裂纹。

Determination and Removal of Endocrine Disruptors in Wastewater by Activated Carbon

This study aimed to evaluate the EDC （endocrine disruptors compounds） in the city of Sao Paulo＇s water sources, from samples collected at predetermined sampling points and to evaluate the adsorptive capacity of these compounds in different types of activated carbon. The effects of these EDC on humans are not well established due to the necessary large exposure time for the effect＇s manifestation. After tests using powdered and granular activated carbon, all samples were filtered under vacuum using cellulose acetate membrane （0.45 μm） to remove eventual impurities, and posteriorly carded out the solid-phase extraction SPE （solid-phase extraction） and chromatographic analysis. The results lead to the conclusion that both powdered activated carbon have removal effectiveness of these compounds by adsorption. Furthermore, great amount of endocrine disruptors were found at several sampling points in river and city＇s water reservoirs, which shows different levels of pollution of water sources, some of them responsible for the watersupply of the city of Silo Paulo, Brazil.