Effect of grafting generations of poly(amidoamine) dendrimer from the sisal fiber surface on the mechanical properties of composites

ABSTRACT

In order to improve the mechanical properties of sisal fiber-reinforced polypropylene composites, the sisal fibers were grafted with poly(amidoamine) dendrimer and the effects of grafting generations on the mechanical properties of composites were studied. The results reveal that the tensile, flexural, and impact strength of the composites are improved considerably with the poly(amidoamine) dendrimer grafting treatment. For the 2.0 generation treatment with the poly(amidoamine) dendrimer, the tensile, flexural, and impact strength of the composites at 30 wt% fiber loading increase by 29%, 13%, and 54%, respectively. However, the thermal and mechanical properties of the sisal fibers decrease after prolonged grafting treatment.

摘要

为了提高剑麻纤维增强聚丙烯复合材料的力学性能，剑麻纤维采用聚（胺）树枝状大分子进行接枝改性，并研究了接枝代数对复合材料力学性能的影响。结果表明，经过聚（胺）树枝状大分子接枝改性后复合材料的拉伸、弯曲及冲击强度得到很大提高。当接枝代数为2.0代时，30%纤维含量的复合材料拉伸、弯曲及冲击强度分别提高29%，13%和54%。然而，剑麻纤维的热性能及力学性能随着接枝处理时间的延长则会下降。

KEYWORDS:

• Natural fiber composites
• poly(amidoamine) dendrimer
• sisal fiber
• mechanical properties
• polypropylene
• grafting

关键词:

• 天然纤维复合材料
• 聚 (胺) 树枝状大分子
• 剑麻纤维
• 力学性能
• 聚丙烯
• 接枝

Funding

This work was supported by the National Natural Science Foundation of China [31300475] and the Natural Science Foundation of Hebei Province [E2016208083, E2012208027];

Additional information

Funding

This work was supported by the National Natural Science Foundation of China [31300475] and the Natural Science Foundation of Hebei Province [E2016208083, E2012208027];