| 乙烯-醋酸乙烯酯橡胶/淀粉纳米复合材料的制备及性能研究 |
| Preparation and properties of ethylene-co-vinyl acetate rubber/Starch nanocomposites |
| 投稿时间：2017-03-06 修订日期：2017-03-06 |
| DOI： |
| 中文关键词: 纳米淀粉 EVM KH570 双重交联 力学性能 |
| 英文关键词: NSt EVM KH570 dual-crosslinked system mechanical properties |
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| 中文摘要: |
| 本文采用反向滴定的方法制备了纳米淀粉(NSt),进而制备乙烯-醋酸乙烯酯橡胶/淀粉(EVM/NSt)纳米复合材料,并研究了纳米淀粉和γ-(甲基丙烯酰氧)丙基三甲氧基硅烷(KH570)对EVM/NSt复合材料结构与性能的影响。研究表明,制备的纳米淀粉粒径约为130 nm。纳米淀粉的填充对EVM有明显的补强作用,15 phr纳米淀粉使EVM的拉伸强度由2.9 MPa提高到了9.2 MPa。研究还表明,KH570通过化学键合将NSt接枝到EVM基体上,显著改善了纳米淀粉与EVM基体间的界面粘合性,并使淀粉作为第二交联点构建了双重交联体系,从而使EVM/NSt复合材料的拉伸强度进一步提高。当加入2.0 phr的KH570时,EVM/NSt纳米复合材料的拉伸强度达到13.2 MPa,伸长率为600%。 |
| 英文摘要: |
| Nano Starch (NSt) was prepared by means of reversed-phase titration and used to prepare ethylene-co-vinyl acetate rubber/Starch (EVM/NSt) nanocomposites. The effects of methacryloxy propyl trimethoxyl silane (KH570) on the properties of nanocomposites were investigated. The results showed that, the average diameter of the prepared NSt was 130 nm. The NSt showed remarkable reinforcing effect on the EVM, the tensile strength (Ts) was enhanced from 2.9 MPa to 9.2 MPa with the NSt loading of 15 phr. What’s more, NSt could be grafted to EVM chains in the presence of KH570 by chemical bonding, improving the interfacial interaction between NSt fillers and EVM matrix. Besides, Nst played a role of second crosslink point to build up the dual-crosslinked system, leading to further increase of Ts. When 2.0 phr KH570 was added, the Ts of EVM/NSt nanocomposite was increased to 13.2 MPa and the elongation at break (Eb) was 600%. |
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