Fiber and Polymer Technology , KTH Royal Institute of Technology , Teknikringen 56 , SE-100 44 Stockholm , Sweden.
RISE Bioeconomy , Drottning Kristinas väg 61 , SE-114 28 Stockholm , Sweden.
Biomacromolecules. 2019 Feb 11;20(2):684-692. doi: 10.1021/acs.biomac.8b01318. Epub 2018 Oct 19.
A water-based one-pot synthesis strategy for converting cellulose nanofibrils (CNF) into a hydrophobic and processable biopolymer grade is devised. CNF was chemically modified through admicellar polymerization, producing fibrils coated with fatty acrylate polymers. The proposed modification targets a change in the interfibrillar interactions and improved CNF compatibility with a degradable plastic composite matrix, poly(butylene adipate- co-terephthalate), PBAT in composites prepared by melt extrusion. CNF had a clear reinforcing effect on PBAT, increasing Young's modulus by at least 35% and 169% at 5 and 20% (w/w) CNF content, respectively. However, unmodified CNF showed aggregation, poor adhesion in the matrix, and severely impaired the ductility of PBAT. CNF modified by admicellar polymerization was homogeneously dispersed in the PBT matrix and showed significantly better preservation of the elongation properties compared to unmodified CNF, especially at 5% (w/w) addition level.
设计了一种将纤维素纳米纤维（CNF）转化为疏水性和可加工的生物聚合物级别的水基一锅合成策略。通过胶束聚合对 CNF 进行化学改性，生成涂覆有脂肪丙烯酸酯聚合物的纤维。所提出的改性旨在改变纤维间相互作用，并提高 CNF 与可降解塑料复合基质聚（己二酸丁二醇酯-共对苯二甲酸丁二醇酯）（PBAT）的相容性，用于通过熔融挤出制备的复合材料中。CNF 对 PBAT 具有明显的增强作用，在 5%和 20%（w/w）CNF 含量下，杨氏模量分别至少提高了 35%和 169%。然而，未改性的 CNF 表现出聚集、与基质的粘附性差，并且严重损害了 PBAT 的延展性。通过胶束聚合改性的 CNF 在 PBT 基质中均匀分散，并与未改性的 CNF 相比，显示出明显更好的伸长性能保持，特别是在 5%（w/w）添加水平下。
