聚乙烯亚胺-g-聚甲基丙烯酸甲酯对天然胶乳的改性研究

Study on natural rubber latex modified by polyethyleneimine-g-poly(methyl methacrylate)

以聚乙烯亚胺(PEI)和甲基丙烯酸甲酯(MMA)为主要原料,采用无皂乳液聚合法制备了聚乙烯亚胺-g-聚甲基丙烯酸甲酯(PEI-g-PMMA)乳液;然后将其与天然胶乳(NRL)进行共混,并着重探讨了PEIg-PMMA对NRL膜性能的影响。研究结果表明:随着PEI-g-PMMA掺量的增加,改性NRL膜的拉伸强度呈先升后降态势;当w(PEI-g-PMMA)=15%(相对于NRL质量而言)时,改性NRL膜的拉伸强度(23.68 MPa)比纯NRL膜提高了60.22%,断裂伸长率略有提升,而耐溶剂性则明显改善。

With polyethyleneimine （PEI） and methyl methacrylate （MMA） as main raw materials, a PEI-g- PMMA[poly（methyl methac171ate）] latex was prepared by soap-free emulsion polymerization. Then, the PEI-g-PMMA latex and natural rubber latex（NRL） were blended, and the influences of PEI-g-PMMA on properties of NRL film were emphatically discussed. The research results showed that the tensile strength of modified NRL film had the trend of rise-fall with increasing PEI-g-PMMA content. The tensile strength （23.68 MPa） of modified NRL film was 60.22% more than that of pure NRL film, and the elongation at break of the former was slightly more than that of the latter, but the solvent resistance of the former was obviously better than that of the latter when mass fraction of PEI-g-PMMA was 15% in NRL.