【作者】 季美琴；

【导师】 张立群；

【作者基本信息】 北京化工大学 ， 材料加工工程， 2004， 硕士

【摘要】 首次通过淀粉糊、橡胶乳液共混－共凝聚法（共沉法）制备了淀粉/丁腈橡胶（NBR）、淀粉/丁苯橡胶（SBR）、淀粉/羧基丁腈橡胶（CNBR）、淀粉/天然橡胶（NR）等复合材料，并与直接共混法制备的复合材料进行了对比。通过对淀粉类型、淀粉糊的浓度、淀粉用量、胶乳的稳定性、混合搅拌时间、混合搅拌速度等因素的考察，淀粉/橡胶复合材料的制备工艺得以优化。在此基础上，用扫描电子显微镜（SEM）、透射电子显微镜（TEM）、X射线衍射（XRD）等微观测试手段，对淀粉/橡胶复合材料的制备机理和微观结构进行了详细研究。SEM和TEM共同显示共沉法可使淀粉粒子非常精细地分散在橡胶中，分散粒径显著减小，界面作用增强。根据XRD推测，共沉法复合技术使淀粉粒子的结晶几乎完全消失。比较力学性能可以发现，共沉法制备的复合材料的力学性能明显优于直接共混法。考察了不同丁苯吡（BSPR）橡胶用量的淀粉/橡胶复合材料的力学性能和微观状态。分别考察了偶联剂双（3－乙氧基甲硅烷基丙基）四硫化物<WP=4>（Si69）、3-氨基丙基三乙氧基硅烷(KH550)和酚醛树脂（RF）对淀粉/SBR复合材料结构和性能的影响。KH550能显著促进硫化，使焦烧期变短。混炼胶的RPA显示，热RF和KH550并用时弹性模量最大。硫化胶的SEM观察表明：由于RF可能与淀粉和橡胶发生一定的反应，增强了填料和橡胶之间的界面，使得复合材料的拉伸断面变得更加粗糙。KH550显著提高了复合材料的拉伸强度和断裂伸长率，可能是界面增强的缘故。含Si69的复合材料由于基体的交联密度提高，易发生脆断，从而很难观察到淀粉粒子的分散状态。更多还原

【Abstract】 NBR/starch, SBR/starch, NR/starch and CNBR/starch composites were prepared firstly by compounding rubber latex with starch paste and co-coagulating. The composites were compared with those composites by directly blending. The effects of kinds of starch, the concentration of starch paste, the amount of starch, the stability character of latex, the mixing time and velocity of starch/latex system on the compounding technique were studied in detail. Scanning electron microscopy and transmission electron microscopy showed that the size of starch particles was much smaller than that of the original starch. X-ray diffraction indicated that the crystalline of starch in rubber/starch composites by the above technique disappeared. In contrast to NBR/starch, SBR/starch, NR/starch and CNBR/starch composites by directly blending, the corresponding NBR/starch, SBR/starch, NR/starch and CNBR/starch <WP=6>composites by co-coagulating exhibited excellent mechanical properties.The morphology and mechanical properties of starch/rubber composites with different amount of butadienstyrenevinyl pyridine rubber were researched. Starch/ SBR composites were prepared by co-coagulating, and the effect of two coupling agents Bis-(γ-triethoxysilylpropyl)-tetrasulphide (Si-69) , 3-aminophopyltrie-thoxysilane (KH-550) and Resorcinol-Formaldebyde (RF) on structure and properties of Starch/SBR composites were investigated. All of the three modifiers reduced the scorch time of the compounds, especially KH550. RPA of the compounds showed that the modulus of compounds combining RF and KH550 was the highest. Scanning Electron Microscope (SEM) of starch/SBR composites showed RF enhanced the interfacial adhesion between filler and rubber obviously. SEM photographs showed that Si69 improved the crosslinking density of rubber matrix, so brittle rupture happened and the dispersion of starch was hard to observe.更多还原