动态硫化热塑性弹性体初探

主要讨论了动态硫化过程中交联剂和助交联剂对交联程度和交联速度的影响;材料微观结构和流变特性对性能的影响。     

热塑性弹性体动态硫化过程及其表征

本文在Brabender塑化仪上研究BR/HDPE系热塑性弹性体的动态硫化过程;考察了温度、密炼机转子转速及硫化剂用量等对动态硫化的影响,并初步提出用硫化扭矩峰来表征动态硫化。     

动态硫化法制备PVC／NBR热塑性弹性体

本研究以动态硫化方式制备聚氯乙烯与丁腈橡胶共混的热塑性弹性休，其具有耐油、耐热、耐臭氧等性能，可以回收及反复使用，并可降低成本。     

用反应挤出技术制聚烯烃类热塑性弹性体

介绍了反应挤出技术的主要牲和工程基础，重点介绍了用反应挤出技术制备聚烯烃类热塑性弹性体。展望了用纳米复合技术制聚烯烃类热塑性弹性体的应用前景。     

低硬度动态硫化SBR／EVA热塑性弹性体的制备及性能

采用动态硫化法制备了SBR/EVA热塑性弹性体(简称:SE弹性体),并对其力学性能及微观相态结构进行了研究.结果表明:在实验范围内,SE弹性体呈现出典型弹性体软而韧的应力-应变行为;当SBR/EVA共混比在70/30～60/40之间时,SE弹性体表现出良好的综合性能.显微镜照片表明:SE弹性体拉伸断面较平滑;SBR粒状物平均尺寸为10μm左右,较均匀地分散在EVA基体中.     

动态硫化天然橡胶/聚丙烯热塑性弹性体研究进展

系统综述了国内外天然橡胶（NR）/聚丙烯（PP）动态硫化热塑性弹性体（TPV）的研究现状,归纳了目前NR/PP TPV产品开发所面临的研发瓶颈,并对未来NR/PP TPV的研究方向进行了展望。     

LDPE/NR反应型热塑性弹性体性能的研究

研究了低密度聚乙烯（ＬＤＰＥ） 与天然橡胶（ＮＲ） 共混物的性能,探讨了不同含量的硫磺、增容剂ＥＶＡ 对共混物力学性能及加工性能的影响,获得了综合性能较好的热塑性弹性体。     

动态硫化PVC/CM热塑性弹性体的制备及性能

采用动态硫化法制备了聚氯乙烯(PVC)/氯化聚乙烯(CM)热塑性弹性体(TPE),并对其力学性能和微观相结构进行了研究。结果表明,动态硫化PVC/CM型TPE的拉伸强度及撕裂强度均随PVC含量的增加而提高,当PVC质量分数低于40%时,其应力-应变曲线呈现出典型的弹性体特征;PVC/CM的共混比为60/40时,所制备的TPE表现出了良好的综合性能;CM分散相粒径在10μm以下且较均匀地分散于PVC基体中。     

动态硫化对聚烯烃热塑性弹性体力学性能的影响

通过分析动态化过程中橡胶相硫化和相反转之间的关系,从粘弹性角度出发,提出用压敏模型来描述橡胶弹性对橡塑间界面结构全的影响,此模型讨论了硫化速度和剪切速度对界面和力学性能的影响。采用分步动态硫化法使弹性体的力学性能得到明显提高。     

低硬度CM／EVA TPV的制备及性能

采用动态硫化法制备了氯化聚乙烯橡胶（CM）／乙烯一醋酸乙烯共聚物（EVA）热塑性硫化胶（TPV）,对其力学性能和动态粘弹行为进行了研究。结果表明：在实验范围内,动态硫化CM／EVATPV呈现出典型弹性体软而韧的应力一应变行为,当CM／EVA的共混质量比在80／20～60／40之间时,所制备的低硬度TPV表现出了良好的综合性能。橡胶加工分析仪（RPA）的研究表明,随着扫描频率的增加,CM／EVATPV的储能模量呈线性增长趋势,损耗因子则呈下降趋势;随着应变的增加,TPV表现出明显Payne效应,储能模量发生大幅度下降,损耗因子在应变大于10．O％后急剧增加。     

Morphological evolution and property changes of acrylate rubber/polyacetal thermoplastic vulcanizates during dynamic vulcanization process

A new type of thermoplastic vulcanizates (TPV) that is resistant to hot oil, high temperature, and aging was prepared using acrylate elastomer (ACM) and polyoxymethylene (POM) as raw materials. The phase transition process and micromorphology development of the blends with the change of dynamic vulcanization (DV) time, and to illustrate the effects of the phase transition and the degree of elastomer phase crosslinking on the macroscopic properties of TPV were investigated. It was shown that ACM crosslinking occurs continuously during 0–8 min of DV, whereas the phase inversion process occurs predominantly during 0–3 min. In contrast, the cross-section of the blends after phase inversion is flat, The constant elongation stress under small deformation, hardness, and permanent deformation after break are reduced, and the elongation at break, nonrelaxable modulus, and aging resistance are improved. The increase in the degree of vulcanization of the ACM phase resulted in a significant increase in the modulus of the blends under large deformation, an increase in the nonrelaxable modulus and relaxable modulus, an increase in the aging resistance, and a decrease in the elongation at tear were observed.     

动态硫化法制备三元乙丙橡胶/聚酰胺热塑性弹性体

采用动态硫化技术制备了三元乙丙橡胶(EPDM)／聚酰胺(PA)热塑性弹性体,研究了增容剂种类及用量、硫化体系及其用量、加料顺序、PA用量对其性能的影响,用扫描电镜分析了其相态结构。结果表明,用13份(质量份,下同)的氯化聚乙烯作为增容剂时,对该共混体系的增容效果最好;硫黄硫化体系是EPDM／PA热塑性弹性体的最佳硫化剂,当硫黄用量为2份时,既保证了该热塑性弹性体中的橡胶相能充分交联,又可避免过硫化对产品性能造成的负面影响;PA用量为35份的EPDM／PA热塑性弹性体具有良好的力学性能、耐溶剂性能和耐热老化性能;EPDM以平均粒径为2～5μm的粒子形态均匀分布于PA连续相中。     

Carbon black‐reinforced dynamically cured EPDM/PP thermoplastic elastomers. I. Morphology,rheology, and dynamic mechanical properties

The structure development, rheological behavior, and viscoelastic properties of carbon black‐filled dynamically vulcanized thermoplastic elastomers based on the ethylene–propylene–diene terpolymer (EPDM) and polypropylene (PP) with the ratio range of 50/50 to 80/20 were studied and compared with similar but unfilled samples. Two‐phase morphology was observed at all ratios for the dynamically cured samples in which rubber particles are dispersed in the thermoplastic matrix. Carbon black distribution in each phase and damping behavior was found to be dependent upon the mixing condition and route of carbon black feeding. However, carbon black tends to stay mainly in the rubber phase, which leads to increase in the viscosity difference and, therefore, increase in the rubber particle size. Tensile strength and rupture energy increased with carbon black loading. © 2000 John Wiley & Sons, Inc. J Appl Polym Sci 75: 1127–1137, 2000     

Failure properties of thermoplastic elastomers from polyethylene/nitrile rubber blends: Effect of blend ratio,dynamic vulcanization,and filler incorporation

Thermoplastic elastomers from blends of high‐density polyethylene and acrylonitrile butadiene rubber were prepared by a melt‐blending technique. The blends were dynamically vulcanized using sulfur, peroxide, and mixed curing systems. The peroxide concentration was varied to obtain samples of varying degrees of crosslinking. The peroxide system showed better mechanical properties. The crosslink density determination by the equilibrium swelling method revealed that the enhancement in properties can be correlated to the extent of crosslinking. It is observed that the effect of dynamic vulcanization on the property improvement is much more pronounced in rubber‐rich blends. To study the effect of filler incorporation on mechanical properties, fillers such as carbon black, silica, silane‐treated silica, and cork‐filled samples were prepared. All filled systems, except cork filled, exhibited superior mechanical properties. Scanning electron micrographs of selected fractured surfaces were analyzed to study the failure mechanism of the different compositions. Various theoretical models were applied to correlate the observed mechanical behavior with that of theoretically predicted values. © 2006 Wiley Periodicals, Inc. J Appl Polym Sci 100: 2912–2929, 2006     

动态硫化丁腈橡胶/尼龙6热塑性弹性体的制备及性能

采用动态硫化法制备了丁腈橡胶/尼龙6热塑性弹性体(NBR/PA 6 TPV),考察了硫化体系、羧基丁腈橡胶(XNBR)以及增塑剂高密度氧化聚乙烯蜡(AC-316 A)和正丁基苯磺酰胺(BBSA)对TPV硫化特性、力学性能和微观形貌的影响。结果表明,以促进剂HVA-2/促进剂DM为硫化体系,动态硫化过程体系黏度的变化比以酚醛树脂/SnCl2为硫化体系时更平稳;但用后者制备TPV,其撕裂强度和扯断伸长率等力学性能更优,PA 6的结晶度更低。XNBR能对NBR和PA 6起到增容作用,当XNBR与NBR的质量比为10/90时,TPV的力学性能最好,NBR在PA 6中分散得最均匀。AC-316 A和BBSA都能对TPV起到增塑作用,随其用量的增加,体系黏度降低。     

世界热塑性弹性体发展现状

综述了世界上各种热塑性弹性体的发展现状及趋势，论述了它们在橡胶工业的应用情况及前景。