多单体熔融接枝天然橡胶及其性能的研究

Study on the properties of NR-g-(GMA-co-St) prepared by multi-monomers melt grafting

以甲基丙烯酸缩水甘油酯(GMA)为接枝单体,苯乙烯(St)为接枝共单体,过氧化二异丙苯(DCP)为引发剂,通过熔融接枝法制备接枝天然橡胶[NR-g-(GMA-co-St)]。研究了GMA、St及DCP用量和接枝温度对NR的接枝率及其力学性能的影响。结果表明,GMA、St和DCP质量分数分别为8%、4%和0.3%,接枝温度为160℃时,NR-g-(GMA-co-St)的接枝率最高,综合力学性能最好;St的加入能明显提高NR的接枝率,并能减轻NR的降解;红外光谱的分析证实了GMA已接枝到天然橡胶分子链上。

NR-g-（GMA-co-St） was prepared by melt grafting using glycidyl methacrylate（GMA） as grafting monomer,styrene（St） as grafting co-monomer, dicumyl peroxide（DCP） as radical initiator in single-screw extruder. The effects of the content of GMA, St and DCP and the grafting temperature on the grafting degree of NR and the mechanical properties of NR-g-（GMA-co-St） were studied. The results showed that,the grafting degree was the highest and NR-g-（GMA-co-St） had the besl mechanical properties when the GMA/St/DCP was 0/4/0.3 and the grafting temperature was 160 ℃ . The addition of St using as co-monomer significantly accelerated GMA grafting onto NR, furthermore, could effectively control the decomposition of NR. NR-g-（GMA-co-St） of FTIR proved that GMA grafted onlo the NR molecular chain.