木质纤维聚合度对高透光率纤维素薄膜力学性能的影响

Influence of Degree of Polymerization of Wood Fiber on Mechanical Properties of Cellulose Films with High Transmittance

中文关键词:  木质纤维  聚合度  纤维素薄膜  力学性能

Key Words:wood fibers  degree of polymerization  cellulose film  mechanical properties

中文摘要:

      以氢氧化钠-亚硫酸盐-蒽醌-甲醇（ASAM）法制备的高聚合度针叶木浆为原料，通过调控漂白时间和漂白剂用量制得形态相近、聚合度不同的4种木质纤维；随后，通过浸渍法将羧甲基纤维素钠（CMC）与上述纤维抄造的原纸复合，制得高透光率木质纤维/CMC纤维素薄膜（以下简称薄膜），并研究纤维聚合度对薄膜力学性能的影响。结果表明，在不显著改变纤维形态和结晶度的条件下，提高纤维聚合度可以显著提高薄膜的力学性能（抗张强度、韧性、耐折度、撕裂指数、耐破指数），而其光学性能无明显的变化规律，透光率介于87.9%~89.8%，雾度介于53.6%~64.1%。

Abstract:

      Soft wood pulp with high degree of polymerization （DP） were first prepared by sodium hydroxide-sulfite-anthraquinone-methanol （ASAM） pulping， and the DP of wood fibers was then regulated by controlling bleaching time and the dosage of bleaching agent， thereby obtaining four types of wood fibers with different DPs and similar morphology. After that， carboxymethyl cellulose （CMC） was compounded with papers made from wood fibers with different DPs to prepare highly transparent wood fiber/CMC films （hereinafter， films） by impregnation and the effect of cellulose DP on mechanical properties of the films were studied as well. The results showed that higher DP led to stronger mechanical properties， e.‍g.， tensile strength， toughness， folding endurance， tear index， burst index， of the films when wood fibers had negligible changes in fiber morphology and crystallinity. Meanwhile， a slight change in optical properties was observed with the transmittance and haze in the range of 87.9%~89.8% and 53.6%~64.1%， respectively.