期刊
POLYMER COMPOSITES
卷 43, 期 2, 页码 798-810出版社
WILEY
DOI: 10.1002/pc.26411
关键词
interfaces; mechanical properties; rubber; structure-property relations
资金
- Scientific Researching Fund from Guangdong University of Petrochemical Technology [2018rc21]
- Foundation of Guangdong Provincial Key Laboratory of Natural Rubber Processing, P.R. China [2019B121203004]
- Science and Technology Special Fund of Guangdong Province [2020S0011, mmkj2020061]
- Central Public-interest Scientific Institution Basal Research Fund for Chinese Academy of Tropical Agricultural Sciences [1630122019001]
- Natural Science Foundation of Guangdong Province [2020A1515011198]
- Characteristic Innovation Projects of Colleges and Universities in Guangdong Province [2020KTSCX081]
- Maoming Science and Technology Plan Project [2019018008]
- Guangdong Province Natural Science Foundation, China [2016A030310308]
The addition of crude beta-dextranase in raw natural rubber/halloysite nanotube composites can improve curing time, elastic modulus, and tensile strength, resulting in minimal hysteresis loss at high temperatures. The findings suggest beta-dextranase as a potential novel interfacial modifier in NR composites.
The effects of crude beta-dextranase in raw natural rubber (NR) on the structure and properties of NR/halloysite nanotube (HNT) composites are investigated by introducing external biological beta-dextranase. Results of curing tests as well as mechanical and dynamic mechanical analyses show that the curing time of the composite increases with beta-dextranase concentration and then plateaus at 6 wt%, at which the maximum values of the elastic modulus, tensile strength, and crosslink density are achieved and the lowest hysteresis loss factor at 0-80 degrees C is observed. Morphological investigations show that the addition of beta-dextranase improves the dispersion of HNTs and enhances interfacial adhesion in the composites owing to hydrogen bonds between beta-dextranase and HNTs, as revealed by Fourier-transform infrared spectroscopy, X-ray diffraction, and X-ray photoelectron spectroscopy analyses. We envision the use of beta-dextranase in NR as a novel interfacial modifier in NR composites.
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