聚丙烯酰胺/改性纳米纤维素晶体纳米复合水凝胶的光聚合制备与表征  

Photopolymerization and Characterization of Polyacrylamide/Modified Nanocrysatlline Cellulose Nanocomposite Hydrogels

作　　者：李本刚[1] 曹绪芝[1] 罗振扬[1] 

机构地区：[1]南京林业大学理学院,江苏南京210037

出　　处：《高分子材料科学与工程》2017年第4期25-28,34,共5页Polymer Materials Science & Engineering

基　　金：江苏省自然科学基金资助项目(BK20140967)

摘　　要：先用马来酸酐对纳米纤维素晶体(NCC)进行表面改性得表面含碳-碳双键的改性NCC(mNCC),然后将丙烯酰胺(AM)和mNCC一起光聚合得PAM/mNCC纳米复合水凝胶;通过红外光谱、扫描电镜、热重分析、差热分析、溶胀实验和拉伸实验研究了水凝胶的结构和性能。结果表明,PAM/mNCC纳米复合水凝胶是一种物理/化学共交联水凝胶;与用质量分数0.25%N,N-亚甲基双丙烯酰胺交联的PAM水凝胶相比,PAM/mNCC纳米复合水凝胶中的微孔尺寸分布更宽,PAM分子链的起始分解温度和玻璃化转变温度升高;当mNCC的用量占AM质量的5%~10%时,PAM/mNCC纳米复合水凝胶的饱和溶胀率、拉伸强度、断裂伸长率分别为PAM水凝胶的2.1~2.7倍、0.45~1.1倍、3.8~7.1倍。The surface of nanocrysatlline cellulose（NCC） was modified with maleic anhydride to obtain modified NCC containing carbon-carbon double bond. The modified NCC and acrylamide were photopolymerized together to get polyacrylamide/modified NCC（PAM/mNCC） nanocomposite hydrogels. The structure and properties of PAM/ mNCC nanocomtxxsite hydrogels were investigated by IR, SEM, TO and DSC, swelling test and tensile experiment. The results show that PAM/mNCC nanocomposite hydrogels are physically and chemically crosslinked. Compared to PAM hydrogel crosslinked with 0.25 % N, N ＇-methylenebisacrylamide, the pore size distribution of PAM/mNCC nanocomposite hydrogels is more wider, and the starting degradation temperature and the glass transition temperature of PAM segment in the nanocomposite hydrogels shift to higher temperature. When the mNCC dosage is 5 % - 10 % of acrylamide, the saturated swelling ratio of PAM/mNCC nanocomposite hydrogels is 2.1-2.7 times of PAlM hydrogel, the elongation at break of PAM/mNCC nanocomposite hydrogels is 3.8--7.1 times of PAM hydrogel, and the tensile strength of PAM/mNCC nanocomposite hydrogels is 0.45-- 1.1 times of PAM hydrogel.

关 键 词：聚丙烯酰胺 纳米纤维素晶体 纳米复合水凝胶 光聚合 

分 类 号：TQ326.4[化学工程—合成树脂塑料工业]