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The Impact of Nano CaCO3 Modified in situ with Methacrylic Acid on the Structure and Properties of Natural Rubber

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【作者】 曾宗强； LI Yongzhen； WANG Chao； ZHAO Pengfei；

【Author】 ZENG Zongqiang;LI Yongzhen;WANG Chao;ZHAO Pengfei;Chinese Agricultural Ministry Key Laboratory of Tropical Crops Processing, Agricultural Products Processing Research Institute, Chinese Academy of Tropical Agricultural Sciences;Rubber Research Institute, Chinese Academy of Tropical Agricultural Sciences;

【机构】 Chinese Agricultural Ministry Key Laboratory of Tropical Crops Processing, Agricultural Products Processing Research Institute, Chinese Academy of Tropical Agricultural Sciences； Rubber Research Institute, Chinese Academy of Tropical Agricultural Sciences；

【摘要】 Natural rubber （NR） was reinforced in situ with nano CaCO3 that had been modified with methacrylic acid （MAA）（M-CaCO3）.The structures and properties of the resulting composites were studied using attenuated total reflection Fourier transform infrared spectroscopy（ATR-FTIR）,scanning electron microscopy（SEM）,and Mooney viscometer and mechanical tests.The results show that when NR is physically blended with CaCO3 and MAA,（Ca2+）-（–OOC） is formed in situ.When dicumyl peroxide （DCP） is added,the (Ca2+)-（–OOC） self-homopolymerizes,and during the curing process poly-(Ca2+)-（–OOC） is formed and grafts to the molecular chains of the NR via carbon-carbon double bonds.The NR/M-CaCO3 composites formed have close interfacial interaction and are well dispersed.Compared with the NR composites reinforced with unmodified nano CaCO3,the NR/M-CaCO3 composites have very different cure characteristics,rheological behavior,and mechanical properties,and these characteristics and properties show a significant relationship with the loading of M-CaCO3.

【Abstract】 Natural rubber （NR） was reinforced in situ with nano CaCO3 that had been modified with methacrylic acid （MAA）（M-CaCO3）.The structures and properties of the resulting composites were studied using attenuated total reflection Fourier transform infrared spectroscopy（ATR-FTIR）,scanning electron microscopy（SEM）,and Mooney viscometer and mechanical tests.The results show that when NR is physically blended with CaCO3 and MAA,（Ca2+）-（–OOC） is formed in situ.When dicumyl peroxide （DCP） is added,the (Ca2+)-（–OOC） self-homopolymerizes,and during the curing process poly-(Ca2+)-（–OOC） is formed and grafts to the molecular chains of the NR via carbon-carbon double bonds.The NR/M-CaCO3 composites formed have close interfacial interaction and are well dispersed.Compared with the NR composites reinforced with unmodified nano CaCO3,the NR/M-CaCO3 composites have very different cure characteristics,rheological behavior,and mechanical properties,and these characteristics and properties show a significant relationship with the loading of M-CaCO3.

【关键词】 natural rubber； nano CaCO3； nano composites； in situ modification；
【Key words】 natural rubber； nano CaCO3； nano composites； in situ modification；
【基金】 Funded by National Natural Science Foundation of China (No.50763006);the Central Public Interest Scientific Institution Basal Research Fund for the Chinese Academy of Tropical Agricultural Sciences (No.1630122018005)
  • 【文献出处】 Journal of Wuhan University of Technology(Materials Science) ,武汉理工大学学报(材料科学版)(英文版) , 编辑部邮箱 ,2020年06期
  • 【分类号】TQ332
  • 【下载频次】19
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