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Chemical modification of exfoliated graphite nanoplatelets with CTBN rubber and highly enhanced impact strength of vinyl ester resin by them
Journal of Industrial and Engineering Chemistry ( IF 5.9 ) Pub Date : 2021-07-14 , DOI: 10.1016/j.jiec.2021.07.005
Sang Gyu Ji 1 , Lawrence T. Drzal 2 , Donghwan Cho 1
Affiliation  

In the present study, exfoliated graphite nanoplatelets (EGN) were chemically modified with carboxyl-terminated poly(butadiene-co-acrylonitrile) (CTBN) liquid rubber via carboxylation, acylation, and subsequently esterification. Multiple characterizations by means of attenuated total reflectance-Fourier transform infrared spectroscopy, X-ray photoelectron spectroscopy, Raman spectroscopy, X-ray diffraction spectroscopy, thermogravimetric analysis, and scanning electron microscopy demonstrated the chemical modification. For comparison, neat vinyl ester resin (VE), EGN/VE and CTBN-EGN/VE composites were prepared by using a free-standing Teflon mold to avoid pressure during curing. The amounts of EGN and CTBN-grafted EGN containing in EGN/VE and CTBN-EGN/VE composites were 1, 3, and 5 wt%, respectively. The impact strength of EGN/VE and CTBN-EGN/VE composites was strongly dependent upon the CTBN-grafted EGN concentration incorporated into neat VE. It was remarkably enhanced up to 220–240% even with low contents (5 wt%) of CTBN-grafted EGN in comparison to neat VE and unmodified EGN/VE. The result revealed that a small amount of EGN chemically modified with liquid rubber CTBN played an important role in increasing the impact toughness of thermosetting resin.



中文翻译:

CTBN橡胶对剥离石墨纳米片的化学改性及其对乙烯基酯树脂的高冲击强度

在本研究中,剥落的石墨纳米片(EGN)用端羧基聚(丁二烯--丙烯腈)(CTBN)液体橡胶通过化学改性羧化、酰化和随后的酯化。通过衰减全反射-傅立叶变换红外光谱、X 射线光电子能谱、拉曼光谱、X 射线衍射光谱、热重分析和扫描电子显微镜的多重表征证明了化学改性。为了进行比较,纯乙烯基酯树脂 (VE)、EGN/VE 和 CTBN-EGN/VE 复合材料是通过使用独立的聚四氟乙烯模具制备的,以避免固化过程中的压力。EGN/VE和CTBN-EGN/VE复合材料中EGN和CTBN接枝EGN的含量分别为1、3和5wt%。EGN/VE 和 CTBN-EGN/VE 复合材料的冲击强度很大程度上取决于掺入纯 VE 中的 CTBN 接枝 EGN 浓度。与纯 VE 和未改性的 EGN/VE 相比,即使 CTBN 接枝的 EGN 含量低(5 wt%),它也显着提高了 220-240%。结果表明,液态橡胶CTBN化学改性的少量EGN对提高热固性树脂的冲击韧性起到了重要作用。

更新日期:2021-08-07
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