Enhanced thermal and mechanical properties of PVA compositesformed with filamentous nanocellulose fibrils
增强的热和机械性能的PVA复合物与丝状纳米纤维素原纤维形成
Keywords:Nanocellulose，CTMP,ultrasonication，ploy(vinyl alcohol)
关键词：纳米纤维素，CTMP，超声波，聚乙烯醇
a b s t r a c t
Long filamentous nanocellulose fibrils (NCFs) were prepared from chemical-thermom echanical pulps(CTMP) using ultrasonication. Their contribution to enhancements in thermal stability and mechanical properties of poly(vinyl alcohol) films were investigated. The unique chemical pretreatment and mechan-ical effects of CTMP loosen and unfold fibers during the pulping process, which enables further chemical purification and subsequent ultrasound treatment for formation of NCFs. The NCFs exhibited higher crys-tallinity (72.9%) compared with that of CTMP (61.5%), and had diameters ranging from 50 to 120 nm. ANCF content of 6 wt% was found to yield the best thermal stability, light transmittance, and mechanical properties in the PVA/NCF composites. The composites also exhibited a visible light transmittance of73.7%, and the tensile strength and Youngrsquo;s modulus were significantly improved, with values 2.8 and2.4 times larger, respectively, than that of neat PVA.
摘要
使用超声波从化学热机械纸浆（CTMP）制备长丝状纳米纤维素纤维（NCF）。 研究了它们对聚（乙烯醇）膜的热稳定性和机械性能的增强的贡献。 在制浆过程中CTMP松散和展开纤维的独特的化学预处理和机械效应，其使得能够进一步化学纯化和随后的用于形成NCF的超声处理。 NCFs与CTMP（61.5％）相比表现出更高的结晶度（72.9％），直径范围为50至120nm。 发现6重量％的ANCF含量在PVA / NCF复合材料中产生最佳的热稳定性，光透射率和机械性能。 复合材料也显示出73.7％的可见光透射率，并且拉伸强度和杨氏模量显着提高，分别比纯PVA的值高2.8和2.4倍。
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