摘要
从N 乙基壳聚糖的35%(重量百分比)甲酸溶液浇铸膜制备片状单晶.单晶呈矩形,最大单晶长度达800μm.片状单晶生长在球晶微纤的顶端或没有球晶的地方.片状单晶中分子链方向取矩形的长边方向.单晶中裂纹的方向也是这一方向.由于浇铸膜吸潮,形成片状单晶的实际高分子浓度为83%左右,在此浓溶液中结晶非常缓慢,是导致该半刚性高分子能形成单晶的主要原因.
Lamellar single crystals were prepared from casting films of 35%(weight percentage) N-ethyl chitosan/formic acid solutions and were in the form of rectangle.The maximum length of these single crystals was 800 μm.The lamellar single crystals grew on top of the fibrils of spherulites or at the regions without spherulites.The molecular chains of the lamellar single crystals aligned along the longer side of the rectangle.The cracks on lamellar single crystals took this direction as well.The actual concentration for producing lamellar single crystals was about 83% due to the hygroscopicity of the casting films.Very slow crystallization in high concentrated solutions was the main reason for this semi-rigid polymer chain to form single crystals.
出处
《商丘师范学院学报》
CAS
2004年第2期1-4,共4页
Journal of Shangqiu Normal University
基金
国家自然科学基金(20374041)
福建省自然科学基金(E0310002)资助项目
