Universidade Federal de São Carlos, Departamento de Engenharia de Materiais, Rodovia Washington Luís, km 235, CEP 13565-905, São Carlos, SP, Brazil.
Universidade Federal de São Carlos, Departamento de Física, Química e Matemática Sorocaba, SP, Brazil.
Carbohydr Polym. 2017 Oct 1;173:50-56. doi: 10.1016/j.carbpol.2017.05.089. Epub 2017 May 29.
This paper investigates the use of an aqueous dispersion of polyethylene copolymer with a relatively high content of acrylic acid as a compatibilizer and as an alternative medium to obtain polyethylene CNF nanocomposites. The CNF content was varied from 1 to 90wt% and the appearance, optical, thermal, mechanical and rheological properties, as well the morphology of the films were evaluated. The PE/CNF films are transparent up to 20wt% of NFC indicating a good dispersion of CNF, but a poor distribution, with PE-rich and CNF-rich regions observed by SEM. Improved mechanical properties were achieved, with a 100% and 15,900% increase in the Young's modulus with 1wt% and 90wt% NFC, respectively. The rheological behavior indicated good melt processability. According to these results, aqueous polyolefin dispersions seem to be a promising, easy and relatively fast route for obtaining cellulose/polyolefins nanocomposites with low to high contents of cellulose nanofibrils.
本文研究了将含有相对较高丙烯酸含量的聚乙烯共聚物的水分散体用作增容剂，并用作获得聚乙烯 CNF 纳米复合材料的替代介质。CNF 含量从 1 到 90wt%变化，评估了薄膜的外观、光学、热学、机械和流变性能以及形态。PE/CNF 薄膜在高达 20wt%NFC 的情况下是透明的，表明 CNF 分散良好，但 SEM 观察到 PE 富区和 CNF 富区的分布较差。力学性能得到了改善，分别在 1wt%和 90wt%NFC 时，杨氏模量提高了 100%和 15900%。流变行为表明具有良好的可加工性。根据这些结果，水基聚烯烃分散体似乎是一种有前途的、简单且相对快速的方法，可以获得具有低至高含量纤维素纳米纤维的纤维素/聚烯烃纳米复合材料。
