当前位置: X-MOL 学术Compos. Sci. Technol. › 论文详情
Our official English website, www.x-mol.net, welcomes your feedback! (Note: you will need to create a separate account there.)
Effect of surface modification on the dispersion, rheological behavior, crystallization kinetics, and foaming ability of polypropylene/cellulose nanofiber nanocomposites
Composites Science and Technology ( IF 9.1 ) Pub Date : 2018-11-01 , DOI: 10.1016/j.compscitech.2018.10.023
Long Wang , Kiyomi Okada , Minami Sodenaga , Yuta Hikima , Masahiro Ohshima , Takafumi Sekiguchi , Hiroyuki Yano

Abstract Herein, the issue of dispersing cellulose nanofiber (CNF) in hydrophobic polymer has been solved through the modification of the CNF surface using alkenyl succinic anhydride (ASA). Polypropylene (PP) nanocomposites containing CNF with various degrees of substitution (DS)−ranging from 0 to 0.4−were prepared by melting and blending in an extruder. Fourier transform infrared spectroscopy (FTIR) results illustrated that the ASA chains were successfully incorporated into the CNF, and the FTIR spectroscopic imaging and X-ray computed tomography demonstrated the well-dispersed hydrophobic-modified CNF with the highest DS (=0.4) in the PP matrix. Rheological results revealed that a network-like structure of CNF was generated in the PP/CNF nanocomposites. Compared with isotactic PP, the PP/CNF composites exhibited improved crystallization kinetics, which could be elucidated via fast scanning chip calorimetry (FSC) analysis. Finally, the foaming performance of the prepared composites was examined using an easily scaled foam injection molding technique. The incorporation of CNF remarkably ameliorated the cellular morphologies of PP foams, resulting in a sharp decrease in cell size and a notable enhancement in cell density.

中文翻译:

表面改性对聚丙烯/纤维素纳米纤维纳米复合材料的分散、流变行为、结晶动力学和发泡能力的影响

摘要 在此,通过使用烯基琥珀酸酐 (ASA) 对 CNF 表面进行改性,解决了纤维素纳米纤维 (CNF) 在疏水聚合物中的分散问题。聚丙烯 (PP) 纳米复合材料包含具有不同取代度 (DS)-范围从 0 到 0.4-的 CNF,通过在挤出机中熔融和共混制备。傅里叶变换红外光谱 (FTIR) 结果表明 ASA 链成功地结合到 CNF 中,FTIR 光谱成像和 X 射线计算机断层扫描表明分散良好的疏水改性 CNF 具有最高的 DS (=0.4)。聚丙烯矩阵。流变学结果表明,在 PP/CNF 纳米复合材料中产生了 CNF 的网络状结构。与全同立构 PP 相比,PP/CNF 复合材料表现出更好的结晶动力学,这可以通过快速扫描芯片量热法 (FSC) 分析来阐明。最后,使用易于缩放的泡沫注射成型技术检查所制备复合材料的发泡性能。CNF 的加入显着改善了 PP 泡沫的细胞形态,导致泡孔尺寸急剧减小,泡孔密度显着增加。
更新日期:2018-11-01
down
wechat
bug