摘要
天然胶乳主要成分为橡胶烃、水和非胶组分。天然胶乳中蛋白质和磷脂的含量对其性能有重要影响。采用高速冷冻离心、碱性蛋白酶及脂肪酶处理浓缩天然胶乳(concentrated natural rubber latex,CNRL)制备脱蛋白胶乳(deproteinized natural rubber,DPNR)、脱脂肪胶乳(lipid-free natural rubber,PNR)、脱蛋白脱脂肪胶乳(lipid-free DPNR,P-DPNR),研究蛋白质和磷脂对天然胶乳胶膜交联密度、力学性能、透光性以及膜形貌的影响。结果表明,经过离心及酶处理后,蛋白质、磷脂含量降低,分子链间交联点减少,交联密度降低;与CNRL相比,DPNR、PNR的拉伸强度由25.14 MPa分别降低至15.81和16.57 MPa,扯断伸长率由810.6%分别升高至930.8%和895.0%;胶膜透光率提高,DPNR、PNR的透光率从71.12%分别提高到85.31%和85.62%;胶膜拉伸断面出现少量孔洞、颗粒。综合分析表明蛋白质和磷脂影响天然橡胶分子链之间交联网络的形成,从而影响胶膜的性能。
The Natural rubber latex consists of rubber hydrocarbon,water and non-rubber components.Properties of latex film are known to be influenced by the content of protein and phospholipids.In this paper,the deproteinized natural rubber(DPNR),lipid-free natural rubber(PNR)and lipid-free DPNR(P-DPNR)were prepared by high speed refrigerated centrifugation,treatment with enzyme decomposition(alkaline proteinase,lipid enzyme)and high speed centrifugation,research on the impact of protein and phospholipids to tensile properties,transmittance,thermal stability and morphology.The results showed that nitrogen content,lipid content and crosslinking density decreased;the tensile properties of DPNR and PNR decreased from 25.14 to 15.81 and 16.57 MPa,the elongation of DPNR and PNR increased from 810.6%to 930.8%and 895%;the transmittance of DPNR and PNR increased from 71.12%to 85.31%and 85.62%;the film stretching section appears a few holes,particles,after enzyme treatment.The results demonstrated that protein and phospholipids influence the formation of the natural rubber crosslinking between molecular chain network,thus affecting the properties of the film.
作者
马明月
雷根珠
张志娥
廖双泉
MA Mingyue;LEI Genzhu;ZHANG Zhie;LIAO Shuangquan(Key Laboratory Ministry of Education for Advanced Materials of Tropical Island Resources,Haikou 570228,China;College of Materials and Engineering,Hainan University,Haikou 570228,China)
出处
《功能材料》
EI
CAS
CSCD
北大核心
2018年第4期4067-4071,共5页
Journal of Functional Materials
基金
国家自然科学基金资助项目(51363006)
公益性行业(农业)科研专项经费资助项目(201403066)
海南省重大科技计划资助项目(ZDKJ2016020-02)
关键词
有机高分子材料
天然胶乳
蛋白质
磷脂
透光性
orgamic polymer materials
natural rubber latex
protein
phospholipids
transmittance
