杜仲胶接枝苯乙烯的研究
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摘要
采用自由基聚合技术将苯乙烯(St)接枝到天然杜仲胶(EUG)分子主链上,探讨了苯乙烯接枝对杜仲胶熔融和结晶行为的影响,使用红外光谱(IR)和氢-核磁共振(1 H-NMR)谱图表征了接枝产物的微观结构。结果表明,接枝苯乙烯后,杜仲胶结晶度下降,β晶型减弱甚至消失。苯乙烯的接枝导致顺式-1,4结构出现,苯乙烯接枝在与双键相连的亚甲基上,而非双键上。
Styrene was grafted on ecommia ulmoides gum by using radical polymerization,the effects of styrene graft on the melting and crystallization behavior of EUG were investigated,the microstructure of the graft copolymer was characterized by using infrared spectroscopy and 1 H-nuclear magnetic resonance.The results showed that EUG crystallization degree decreased,βcrystal decreased or even disappeared after grafting styrene.Graft of styrene led to occourance of cis-1,4structure.Styrene was grafted on EUG backbone through the methylene group next to double bond rather than carbon-carbon double bond.
Styrene was grafted on ecommia ulmoides gum by using radical polymerization,the effects of styrene graft on the melting and crystallization behavior of EUG were investigated,the microstructure of the graft copolymer was characterized by using infrared spectroscopy and 1 H-nuclear magnetic resonance.The results showed that EUG crystallization degree decreased,βcrystal decreased or even disappeared after grafting styrene.Graft of styrene led to occourance of cis-1,4structure.Styrene was grafted on EUG backbone through the methylene group next to double bond rather than carbon-carbon double bond.
引文
[1]杜红岩,谢碧霞,绍松梅.杜仲胶的研究进展与发展前景[J].中南林学院学报,2003,(4):95-99.
[2]李良萍,李翔,薛兆弘,等.天然橡胶/杜仲胶共混硫化胶性能研究[J].特种橡胶制品,2001,22(3):1-3.
[3]傅玉成.杜仲胶的改性与应用[J].橡胶工业,1993,40(4):247-248.
[4]朱峰,岳红,新型功能材料杜仲胶的研究与应用[J].安徽大学学报,2005,29(5):36-39.
[5]严瑞芳.一种古老而又年轻的天然高分子-杜仲胶[J].高分子通报,1989,(2):39-43.
[6]薛兆宏,谢怜,严瑞芳.共混硫化杜仲胶的研究[J].弹性体,1992,2(1):12.
[7]严瑞芳,薛兆宏.高弹性杜仲橡胶及其硫化弹性机理[J].弹性体.1991.1(3):12.
[8]林春玲,岳红.杜仲胶/天然橡胶/顺丁橡胶并用胶的工艺研究[J].中国胶黏剂,2008,2,17-20.
[9]孟凡良,黄宝深,姚薇,等.天然橡胶/反式-1,4-聚异戊二烯并用胶硫化体系的研究[J].合成橡胶工业,2003,26(4);221-225.
[10]Kobayashi E.,Hayashi N.,Aoshima S.,et al.Homo-and copolymerization of butadiene and styrene with neodymium tricarboxylate catalysts[J].Journal of polymer science Part A:polymer chemistry,1998,36(2):241-247.
[2]李良萍,李翔,薛兆弘,等.天然橡胶/杜仲胶共混硫化胶性能研究[J].特种橡胶制品,2001,22(3):1-3.
[3]傅玉成.杜仲胶的改性与应用[J].橡胶工业,1993,40(4):247-248.
[4]朱峰,岳红,新型功能材料杜仲胶的研究与应用[J].安徽大学学报,2005,29(5):36-39.
[5]严瑞芳.一种古老而又年轻的天然高分子-杜仲胶[J].高分子通报,1989,(2):39-43.
[6]薛兆宏,谢怜,严瑞芳.共混硫化杜仲胶的研究[J].弹性体,1992,2(1):12.
[7]严瑞芳,薛兆宏.高弹性杜仲橡胶及其硫化弹性机理[J].弹性体.1991.1(3):12.
[8]林春玲,岳红.杜仲胶/天然橡胶/顺丁橡胶并用胶的工艺研究[J].中国胶黏剂,2008,2,17-20.
[9]孟凡良,黄宝深,姚薇,等.天然橡胶/反式-1,4-聚异戊二烯并用胶硫化体系的研究[J].合成橡胶工业,2003,26(4);221-225.
[10]Kobayashi E.,Hayashi N.,Aoshima S.,et al.Homo-and copolymerization of butadiene and styrene with neodymium tricarboxylate catalysts[J].Journal of polymer science Part A:polymer chemistry,1998,36(2):241-247.