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Study of Rubber Toughening Through Alloy Formation Combined with Sol-gel Method

溶胶-凝胶法合金形成橡胶增韧研究

基本信息

批准号：
04453110
负责人：
TAKAYANAGI Motowo
金额：
$ 4.35万
依托单位：
Kyushu Sangyo University
依托单位国家：
日本
项目类别：
Grant-in-Aid for General Scientific Research (B)
财政年份：
1992
资助国家：
日本
起止时间：
1992 至 1993
项目状态：
已结题

项目摘要

Stereorubbers were toughened by silica in-situ formed with a sol-gel method. The introduction of water into hydrophobic rubber was carried out by alloy formation of rubber with poly(ethylene-co-vinylalcohol)(EVAL) in the presence of compatibilizer. Tetraethylorthosilicate(TEOS) dissolved in rubber reacted with water during blending and curing to form silica particles in rubber matrix, which were identified by FTIR, EDX and EPMA.Mechanical properties of alloy rubber vulcanizate were superior to those of the corresponding pure rubber vulcanizate. Silica particles formed by sol-gel reaction further reinforced alloy rubber.It was found in a preliminary work that an immiscible system of TEOS and water could be smoothly reacted in the presence of ethanol which playd a role of compatibilizer. Vinylalcohol unit in EVAL resembled molecular structure of ethanol and presented a suitable reaction site for sol-gel reaction. Ethylene unit of EVAL was nonpolar with some affinity to rubber matrix. EVA … More L with lowest melting tempeature was selected from market brands and to thisperse EVAL in rubber matrix, a compatibilizer of PIR-AM was employed which included a functional imidatonium ion group. This group formed a strong ion-dipole bond with hydroxyl group in EVAL, resulting in formation of morphology of alloy rubber dispersed by EVAL fine particles. The silica particles with diameter of 3 mu m or less could be clearly detected by their clear-cut interface in BDR matrix or at the side of EVAL particles.Tensile properties were evaluated for both series of BDR and PIR.The samples were pure rubber vulcanizates, the ones modified by alloy formation with various compositions of EVAL and PIR-AM, and the ones reinforced by the silica in-situ formed in alloy rubber matrix. The hydrogen bonds in EVAL particles dispersed in alloy were considered to be effectively deformation-resistant and provide toughness. Precipitated silica by the reaction of TEOS and water increased elongation-at-break. When compared with the data for BDR, the effectiveness of EVAL and PIR-AM on rubber properties of PIR was more distinctive. Use of PIR/EVAL/PIR-AM=100/20/20 resulted in 12 MPa of tensile strength and 900 % of elongation-at-break. The in-situ formation of silica in rubber matrix was clearly effective in reinforcement. Less

采用溶胶-凝胶法原位生成白炭黑对立构橡胶进行增韧。在相容剂存在下，通过橡胶与聚乙烯-乙烯醇共聚物（EVAL）的合金化，将水引入疏水性橡胶中。采用FTIR、EDX和EPMA等分析手段，证实了溶于橡胶中的正硅酸乙酯（TEOS）在共混和硫化过程中与水发生反应，在橡胶基体中形成了SiO2粒子，合金橡胶硫化胶的力学性能上级相应的纯橡胶硫化胶。溶胶-凝胶反应生成的SiO_2粒子进一步增强了合金橡胶。初步研究发现，在乙醇的存在下，TEOS和水的不互溶体系可以顺利地进行反应，乙醇起到了增容剂的作用。EVAL中的乙烯醇单元类似于乙醇的分子结构，为溶胶-凝胶反应提供了合适的反应位点。EVAL的乙烯单元是非极性的，与橡胶基体有一定的亲和力。伊娃 ...更多信息从市售牌号中筛选出熔点最低的聚乙烯醇L，并在橡胶基体中采用含有咪唑鎓离子功能基团的PIR-AM作为EVAL的增容剂。该基团与EVAL中的羟基形成强的离子偶极键，从而形成EVAL微粒分散的合金橡胶形态。本文研究了纯橡胶硫化胶、不同组成的EVAL和PIR-AM合金化改性胶以及在合金化橡胶基体中原位生成的SiO2补强胶的拉伸性能。EVAL颗粒中的氢键分散在合金中被认为是有效的抗变形和提供韧性。通过正硅酸乙酯和水的反应结晶的二氧化硅增加断裂伸长率。与BDR相比，EVAL和PIR-AM对PIR胶料性能的改善效果更明显。使用PIR/EVAL/PIR-AM=100/20/20导致12 MPa的拉伸强度和900%的断裂伸长率。在橡胶基体中原位形成的二氧化硅在增强方面明显有效。少