期刊
POLYMERS
卷 10, 期 5, 页码 -出版社
MDPI
DOI: 10.3390/polym10050485
关键词
graphene; liquid crystalline polyurethane; epoxy resin; composites
资金
- National Natural Science Foundation of China [51605109, 51763009, 51463007]
- Natural Science Foundation of Guangxi Province, China [2015GXNSFBA139231, 2016GXNSFBA380004]
- Guangxi Universities Scientific Research Project [YB2014165]
- Guangxi Ministry-Province Jointly-Constructed Cultivation Base for State Key Laboratory of Processing for Non-ferrous Metal and Featured Materials [15AA]
- Department of Science and Technology of Guilin [2016012005]
Graphene nanosheets (GNs) often result in incompatibility with the hydrophobic polymer matrix, and the tendency to form aggregates during processing. Herein, liquid crystalline polyurethane modified GNs (GPLP) were obtained by - stacking interactions between GNs and perylene bisimide derivatives, and then in-situ polymerization of liquid-crystalline polyurethane. Spectroscopic studies, elemental analysis, and thermal properties confirmed the successful - stacking and the integrated structure of GPLP. The good dispersion state of GPLP in the epoxy matrix (EP), and the strong interactions between GPLP and EP, lead to the significant improvement of the thermal and mechanical performance of the GPLP/EP composites. The impact strength, Young's modulus, tensile strength, and toughness of the GPLP/EP composites with 1.47 wt % GNs reached the highest values of 54.31 kJ/m(2), 530.8 MPa, 112.33 MPa and 863 J/m(3), which significantly increased by 210%, 57%, 143%, and 122% compared to that of neat epoxy, respectively. As well, the glass transition temperature increased by a notable 33 degrees C. It is hoped that this work can be used to exploit more efficient methods to overcome the poor adhesion between GNs and polymers.
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