摘要
采用碱预处理硫酸水解法制备出具有纤维素Ⅱ型的纳米纤维素(NCC)。通过共混和冷冻预处理共混制得不同质量分数纳米纤维素的NCC/聚乙烯醇(PVA)膜。采用傅里叶变换红外光谱、环境扫描电子显微镜、紫外可见分光光度计、热重分析仪对复合膜的微观形貌、纳米纤维素的分散情况、透光率、拉伸强度、断裂伸长率和热学性能进行表征,结果表明:同PVA膜对照样相比,添加质量分数0.5%的NCC对共混膜有较好的增强作用,拉伸强度提高15%,对透光率影响不大,能很好的分散在NCC/PVA共混膜内;冷冻预处理使纳米纤维素在NCC/PVA共混膜内分散更好,拉伸强度提高了16%,透光率与对照样透光率相比基本持平。
The nano-cellulose （NCC） with cellulose Ⅱ type was prepared by sulfuric acid hydrolysis after alkali pretreatment. NCC/polyvinylalcohol（PVA） membrane of different mass fraction of NCC was prepared through solution blending and frozen pretreatment, respectively. Membrane morphology, dispersion of NCC, transmittance, tensile strength, elongation at break and thermal properties were characterized by fourier transform infrared （FT-IR）, environmental scanning electron microscopy （SEM）, UV-Vis spectrophotometer （UV）, thermo-gravimetrie （TG）analyzer, respectively. The results indicated that addition of 0.5 % NCC showed reinforcement effect on tensile strength of the NCC/PVA membrane, and the tensile strength of NCC/PVA membrane increased 15 % in contrast to the pure PVA membrane （control sample）. Furthermore, there was no negative impact on the transmittance of the NCC/PVA membrane due to the good dispersion ability of NCC in PVA sustance. The dispersibility of NCC in PVA membrane was better after frozen pretreatment, and the tensile strength of NCC/PVA membrane increased by 16% than that of control sample when 0. 5 % NCC was added. A slightly increase of transmittance was observed, as well.
出处
《林产化学与工业》
EI
CAS
CSCD
北大核心
2013年第3期24-30,共7页
Chemistry and Industry of Forest Products
基金
国家自然科学基金资助项目(31070633)
人力资源和社会保障部留学回国人员科技活动择优资助项目(07041311401)
国家级大学生创新训练项目(1110225029)
关键词
冷冻预处理
纳米纤维素
共混膜
共混机理
透光率
frozen pretreatment
nano-cellulose
blending membrane
blending mechanism
transmittance
