文献类型：期刊文献

中文题名：氧化海藻酸钠/天然乳胶复合材料的制备与性能

英文题名：Preparation and Properties of Dialdehyde Sodium Alginate/Natural Rubber Composite

作者：张坤涛[1];田晓慧[1];孙金煜[1];元以中[1];赵伟如[1]

机构：[1]华东理工大学材料科学与工程学院,上海200237

年份：2018

卷号：44

期号：2

起止页码：202

中文期刊名：华东理工大学学报（自然科学版）

外文期刊名：Journal of East China University of Science and Technology

收录：CSTPCD;;Scopus;北大核心:【北大核心2017】；CSCD:【CSCD_E2017_2018】；

语种：中文

中文关键词：天然乳胶;氧化海藻酸钠;蛋白质溢出量;物理共混

外文关键词：natural rubber;dialdehyde sodium alginate;protein spillage;physical blending

摘要：采用高碘酸钠对海藻酸钠进行氧化处理,制备了具有二醛结构的氧化海藻酸钠(DASA),并通过物理共混法加入到天然乳胶(NR)中,制备了NR/DASA复合膜。DASA中的醛基与NR中的蛋白质发生共价交联反应,大幅降低了NR/DASA复合膜蛋白质溢出量。当DASA氧化度为0.17 mmol/g,添加量(质量分数,下同)为10%时,NR/DASA复合膜蛋白质溢出量由1 420μg/g降至42μg/g,说明DASA可将蛋白质有效固定在NR膜内部,从而充分发挥蛋白质对NR的促硫化和防老化等作用。力学性能测试表明,NR/DASA复合膜经硫化处理后拉伸强度提升了28.9%,加速老化后,拉伸强度降低量仅有2.7 MPa。此外,改性后NR膜的表面平整度、耐溶剂性能和耐热降解性能也得到了明显提高。
Protein is an important component of natural latex(NR).However,it is easy to migrate onto the surface during the process of film formation,resulting in high protein spillover,which leads to allergies and mildew easily.Traditional solutions such as chlorination and radiation are very complex and tend to cause serious environmental pollution issues.Dialdehyde sodium alginate(DASA)has a strong covalent cross-linking effect on proteins and there are few reports on the reduction of NR protein spillover.In this paper,DASA was prepared by oxidation of sodium alginate with sodium periodate.The results showed that the oxidation degree of DASA increased with the concentration of sodium periodate,but the molecular weight decreased.The protein spillage of NR/DASA composite film prepared by physical blending decreased from 1 420μg/g to 42μg/g,indicating that the covalent cross-linking reaction between the aldehyde group in DASA and the protein decreased the mobility of proteins,hence greatly reduced the protein spillover of NR/DASA film.Meanwhile mildew and contact allergy effect can be alleviated.The uniform distribution of the protein in NR film can also increase the solubility of the vulcanization accelerator,which makes the vulcanization reaction easier.Furthermore,the protein can also consume the peroxide radicals generated in the NR film during storage,thus lowering its aging rate.The tests of mechanical properties show that the tensile strength of NR/DASA composite film increases by 28.9%after vulcanization,and only decreases by 2.7 MPa after accelerating the aging treatment.Atomic force microscopy(AFM)and thermogravimetric(TG)analysis show that the surface smoothness and thermal degradation resistance of the NR/DASA films are also significantly improved.In addition,the solvent resistance of NR/DASA films in cyclohexane and petroleum ether is also greatly improved.