摘要
在光交联聚氨酯预聚物中加入改性短纤维,得到一种含纤维可光交联复合体。在适当条件下,通过聚氨酯末端和纤维表面的双键聚合,得到一种多相结构的亲水凝胶FPCPU。由于纤维与聚氮酯之间形成化学结合,而纤维本身仍保持其结晶和取向,因此加入的纤维能产生良好的增强作用。在相同条件下,FPCPU的强度是PCPU载体的1～2倍。用该载体包埋枯草杆菌制得固定化细胞,具α-淀粉酶活力比游离细胞高出40～50％,而PCPU固定化细胞的酶活力只比游离细胞高30％。
Short fibre miscelles with unsaturated bonds on the surface were introduced into the photocrosslinkable polyurethane prepolymer and a kind of fibre-containing photo-crosslinkable polyurethane prepolymer FPCPU was obtained. FPCPU can be crosslinked by polymerization of the double bonds on the ends of the polyurethane prepolymer and on the surface of the fibre at the existence of the photo sensitive agents and at UV light irradiations. The obtained FPCPU is a kind of hydrophilic gel, possessing a multi-phase composite structure. The short fibre miscelles can reinforce the system well because of crosslinking with the bulk prepolymer and the fibre's retained orientation and crystallinisty. Under same conditions, the strength of FPCPU is 2-3 times higher than that of PCPUM which containing no fibres. The obtained new carrier can be used to entrap the Bacillus Substilis living cells producing α-amylase. The enzyme activity produced is usually about 40%-50% higher than that of the untrapped free cells at same conditions, and of about 30% higher at maximun than that of no fibre-containing carrier developed by us before, such as PCPU, PCPUM etc.
出处
《高分子材料科学与工程》
EI
CAS
CSCD
北大核心
1993年第6期38-42,共5页
Polymer Materials Science & Engineering
关键词
光交联
聚氨酯
含纤维
载体
photo-crosslinkable prepolymer, photo-crosslinked polyurethane,fibre-containing carrier,immobilized cells, α-amylase.
