NaCS／PDMDAAC聚电解质复合膜的制备及性质测定

该文以新型聚电解质复合膜的开发为背景,以纤维素硫酸钠(sodium cellulose sulfate,简称NaCS)为聚阴离子、聚二甲基二烯丙基氯化铵[Poly(dimethylallylammonium chloride),简称PDMDAAC]为聚阳离子,利用两者的界面反应制备NaCS／PDMDAAC聚电解质复合膜,优化了复合膜的制备条件,并对复合膜的性质进行了表征,如采用扫描电镜观察膜的表面形态及断面结构,测定其溶胀性、截留分子量等。

NaCS/PDMDAAC聚电解质复合膜的制备及静态接触角测定

A new type of NaCS/PDMDAAC polyelectrolyte complex membrane prepared by interfacial reaction of sodium cellulose sulfate as polyanions and poly(dimethylallylammonium chloride)as polycations was proposed.The static contact angle of the polyelectrolyte complex(PELC)membrane surface was measured to characterize membrane wettability.The effects of concentration of polyelectrolyte,molecular weight,and reaction time on contact angle were investigated.It was found that NaCS/PDMDAAC PELC membrane was hydrophilic.Its contact angle decreased with the increasing concentration of NaCS and molecular weight of PDMDAAC,and increased with the increasing concentration of PDMDAAC and reaction time.

细胞固定化催化生产精细化学品的研究进展

细胞固定化技术具有流程简单、生物相容、操作稳定等优点,可有效保证细胞活性,发挥细胞的催化性能;易实现胞内多种酶的共表达及催化,且底物选择特异性强,有利于高效的细胞催化生产精细化学品。该文简述了国内外细胞固定化催化生产的工业化程度及主要精细化学品的产业化情况,介绍了表面附着、凝胶包埋、聚电解质层层自组装膜、共价键合细胞固定化方法,及其在二元醇、生物乙醇、乳酸、丙酮、多糖等精细化学品生产中的研究现状和进展,并分析讨论了各种方法存在的问题。最后对细胞固定化催化生产精细化学品面临的技术挑战及研究方向进行了展望。