不同取代度N,N-双十二烷基化壳聚糖的制备、表征及其单分子膜性能  

Preparation,characterization and monolayer properties of N,N-dialkyl chitosan with differente degree of substitution

作　　者：刘决照[1] 李明春[1] 辛梅华[1] 明如镜[1] 

机构地区：[1]华侨大学材料科学与工程学院福建省高校功能材料重点实验室,福建厦门361021

出　　处：《化工进展》2010年第7期1272-1275,共4页Chemical Industry and Engineering Progress

基　　金：国家自然科学基金(20574024);福建省科技重点项目(2009H0030);复旦大学聚合物分子工程教育部重点实验室开放课题;福建省自然科学基金(2009J01029和E0810019)资助项目

摘　　要：以壳聚糖和月桂醛为原料、十二烷基磺酸钠为相转移催化剂,制备N,N-双十二烷基化壳聚糖(N,N-DLCS),并进一步分离成两种不同取代度的产物N,N-DLCS-1和N,N-DLCS-2。用FTIR、EA和1HNMR等方法进行表征,并研究其单分子膜性能。结果表明:N,N-DLCS-1的烷基取代度较高,N,N-DLCS-2较小。两种样品均可在水面上形成单分子膜,其中N,N-DLCS-1的崩溃压πc较高,极限分子占据面积Aex较小,最大压缩模量Cs-1较大,单分子膜的凝聚性和稳定性更好。单分子膜的致密度和稳定性随着取代度的增加而增大。With sodium dodecyl sulfonate as phase transfer catalyst,N,N-dialkyl chitosan（N,N-DLCS-1 and N,N-DLCS-2）with different degree of substitution were prepared and characterized by FTIR,EA and 1H NMR.Properties of monolayers of these two samples were also studied.Experimental results showed that N,N-DLCS-1 has a higher degree of substitution,both samples could form a monolayer at the air-water interface.The sample N,N-DLCS-1 showed higher collapse pressure πc,maximum compressibility modulus Cs-1 and smaller extrapolated area Aex,the monolayer from which is more inseparable and stable due to the stronger intermolecular hydrophobic interaction derived from the higher degree of alkyl substitution.

关 键 词：壳聚糖 烷基化 取代度 单分子膜 

分 类 号：O636.1[理学—高分子化学]