共查询到18条相似文献,搜索用时 562 毫秒
1.
2.
3.
使用密炼机,采用动态硫化工艺制备了乙烯-乙酸乙烯酯共聚物/三元共聚尼龙热塑性硫化胶(EVM/tPA TPV)和乙烯-乙酸乙烯酯-甲基丙烯酸缩水甘油酯共聚物/三元共聚尼龙热塑性硫化胶(EVM-GMA/tPA TPV),研究了转子转速对两种热塑性弹性体体力学性能和耐热油等性能的影响。结果表明,在一定范围内提高转子转速,热塑性弹性体的力学性能呈上升趋势,当转子转速为80 r/min时,两种热塑性弹性体的综合力学性能最佳;当转子转速达到60 r/min以上时,两种热塑性弹性体的耐热油性能良好;随着转子转速的增加,两种热塑性弹性体的弹性得到改善;在相同转子转速条件下,EVM-GMA/tPA TPV比EVM/tPA TPV具有更好的力学性能、弹性和耐热油性能。 相似文献
4.
利用微纳层叠挤出设备良好的分布分散混合作用,制备了聚氨酯/硅橡胶(TPU/MVQ)热塑性硫化橡胶(TPV),研究了制备方法、动态硫化温度、螺杆转速、橡塑比、相容剂种类及含量对TPV性能的影响。结果表明,与普通共混相比,微纳层叠加工制备的TPV在拉伸强度和断裂伸长率上分别提升了12.4%、12.1%;硫化温度190℃、螺杆转速200 r/min时,TPV力学性能最佳,拉伸强度、断裂伸长率、硬度、压缩永久变形分别为6.69 MPa、363.8%、57.6 A、31.5%;随着橡胶含量的增加,TPV拉伸强度、断裂伸长率、硬度下降,弹性回复性能、耐老化性能、耐油性能提升;相容剂硅烷改性聚氨酯(TPSiU)和乙烯丙烯酸甲酯共聚物(EMA)最佳用量分别为10份和5份,与EMA相比,TPSiU作为相容剂时,材料弹性回复性能、耐油性能更优,而EMA对TPV的断裂伸长率提升作用明显。 相似文献
5.
动态硫化溴化丁基橡胶/三元共聚尼龙热塑性弹性体力学性能的影响因素 总被引:1,自引:0,他引:1
采用动态硫化法制备了溴化丁基橡胶/三元共聚尼龙热塑性弹性体(BIIR/CO-PA TPV),考察了硫化体系、增容剂、橡塑比、硫化温度、返炼次数对BIIR/CO-PA TPV力学性能的影响,并对TPV脆断面的微观形貌进行了观察。结果表明,无论采用过氧化二异丙苯还是ZnO为硫化体系,BIIR混炼胶的硫化效果均较好。添加增容剂可以改善BIIR与CO-PA的相容性,提高TPV的力学性能;马来酸酐接枝乙烯-辛烯共聚物与氯化聚乙烯的增容效果相当。橡塑比(质量比)为7∶3~6∶4、硫化温度为180℃时,制备的TPV力学性能最好。随着返炼次数的增加,TPV的力学性能降低。 相似文献
6.
7.
采用Haake转矩流变仪制备了乙烯-辛烯共聚物(POE)/硅橡胶(MVQ)动态硫化热塑性弹性体(TPV),考察了共混温度、转速、动态硫化时间对POE/MVQ共混物硫化特性、TPV物理机械性能及加工特性的影响,观察了硫化剂不同投料方式下TPV的外观形貌。结果表明,在共混温度为130℃、转速为50~60 r/min、动态硫化时间约为8 min的条件下,采用POE与MVQ混匀后分3批加入硫化剂的方式,所得POE/MVQ TPV的综合性能较好,表面光滑且有韧性。 相似文献
8.
9.
采用动态硫化法制备了加成型有机硅橡胶(SR)/聚氨酯(TPU)热塑性弹性体(TPV),系统研究了Pt催化剂含量对共混扭矩、SR相交联度、SR/TPU热塑性弹性体相形态以及力学性能的影响。结果表明:随着Pt催化剂含量的增加,橡胶相交联度以及试样力学性能逐渐提高;当Pt催化剂含量高于0.16 phr,交联度基本保持不变,TPV的力学性能稳定。相态结构研究表明:随着动态硫化的进行,体系发生由双连续相向"海-岛"结构的相反转,且随着Pt催化剂含量的提高和硫化时间的延长,橡胶相尺寸减小。此外,还研究了SR/TPU配比对其TPV力学性能的影响,发现当SR/TPU配比为60/40时,热塑性弹性体的综合力学性能最佳。 相似文献
10.
11.
To prepare thermoplastic polyurethane (TPU)/ethylene‐octylene copolymer (POE) blends, which are thermodynamically immiscible, maleated POE and aminated POE were incorporated as compatibilizers. Effect of addition of the compatibilizers and their contents on morphology, coalescence, and mechanical properties of TPU/POE blends were investigated. The microstructural observation revealed that the compatibilizers are located at the interface in the blends, forming a stable interfacial layer. As a result, the dispersed phase particle size was greatly reduced and tensile properties of the blends were significantly improved. POE‐NH2 provides the blends with higher compatibility than POE‐MA. The interfacial interaction offered by the compatibilizers was found to be a function of the amount of the reactive groups grafted onto POE. © 2007 Wiley Periodicals, Inc. J Appl Polym Sci, 2007 相似文献
12.
13.
Yang Pan Huifang Ma Shujie Zhou Huixuan Zhang 《Polymer-Plastics Technology and Engineering》2020,59(17):1887-1898
ABSTRACT Herein, graft-modified ethylene-1-octene copolymer (POE-g-GMA) and styrene-butadiene-styrene triblock copolymer (SBS-g-GMA) were found to be excellent reactive compatibilizers for immiscible poly(ethylene terephthalate) (PET)/high-density polyethylene (HDPE) blends via in-situ reaction compatibilization. With increase in compatibilizer amount, uniform phase morphology was observed in all the blends. Thus, exhibiting enhanced mechanical properties, especially, the notched Izod impact strength. In comparison with SBS-g-GMA, compatibilizer POE-g-GMA demonstrated greater impact on the compatibility. The addition of 15% POE-g-GMA produced blends with best mechanical properties. Besides, both POE-g-GMA and SBS-g-GMA enhanced the melt viscosity of PET/HDPE blends. 相似文献
14.
将生物基高分子材料杜仲胶(EUG)和聚乳酸(PLA)通过动态硫化技术制备了具有形状记忆性能的热塑性硫化胶(EUG/PLA TPV)。通过扫描电子显微镜、差示扫描量热、动态力学和力学性能测试及热机械循环分析等手段分别考察了EUG/PLA TPV的微观形貌、相容性、热性能、动态力学和力学性能及形状记忆性能。结果表明,增容剂腰果酚有效改善了EUG相与PLA相之间的相容性,从而提高了EUG/PLA TPV的力学性能。当橡塑质量比为5/5时,拉伸强度为10.5 MPa,扯断伸长率达到286%,是纯PLA的约48倍。EUG/PLA TPV具备特殊的双连续相结构,可以赋予其良好的形状记忆性能,形状固定率最高达到93%左右,形状回复率最高达到98%左右。 相似文献
15.
将聚酯型和聚醚型聚氨酯弹性体(TPU385E,TPU8685)分别与不同乙酸乙烯酯含量的乙华平橡胶(EVM400,EVM700)进行共混,考察了原料种类、共混比对共混物力学性能和耐磨性的影响。结果表明,随着TPU用量的增加,EVM/TPU共混物的拉伸强度、邵尔A硬度、100%定伸应力和300%定伸应力均提高,扯断伸长率下降;随着EVM用量的增加,EVM/TPU共混物的拉伸强度、邵尔A硬度、100%定伸应力和300%定伸应力均降低,扯断伸长率增大;随着TPU用量的增加,EVM/TPU共混物的耐磨性提高;TPU8685/EVM400共混物具有最大的拉伸强度,TPU385E/EVM700共混物具有最大的扯断伸长率,TPU8685/EVM700共混物具有最好的耐磨性;当2种TPU与EVM400质量比都为50/50时,TPU385E/EVM400的耐磨性最差。 相似文献
16.
Dynamically vulcanized thermoplastic elastomers nanocomposites (TPV nanocomposites) based on linear low density polyethylene (LLDPE)/reclaimed rubber/organoclay were prepared via one‐step melt blending process. Maleic anhydride grafted polyethylene (PE‐g‐MA) was used as a compatibilizing agent. The effects of reclaimed rubber content (10, 30, and 50 wt %), nanoclay content (3, 5, and 7 wt %), and PE‐g‐MA on the microstructure, thermal behavior, mechanical properties, and rheological behavior of the nanocomposites were studied. The TPV nanocomposites were characterized by X‐ray diffraction, transmission electron microscopy, scanning electron microscopy (SEM), differential scanning calorimeter, mechanical properties, and rheometry in small amplitude oscillatory shear. SEM photomicrographs of the etched samples showed that the elastomer particles were dispersed homogeneously throughout the polyethylene matrix and the size of rubber particles was reduced with introduction of the organoclay particles and compatibilizer. The effects of different nanoclay contents, different rubber contents, and compatibilizer on mechanical properties were investigated. Increasing the amount of nanoclay content and adding the compatibilizer result in an improvement of the tensile modulus of the TPV nanocomposite samples. © 2011 Wiley Periodicals, Inc. J Appl Polym Sci, 2011 相似文献
17.
Dynamic vulcanized thermoplastic polyurethane (TPU)/methyl vinyl silicone rubber (MVQ) thermoplastic vulcanizates (TPVs) were prepared in torque rheometer. The influence of the type and amount of peroxide crosslinking agent on the mechanical properties, thermal stability, micromorphology and melt flowability was systematically investigated. The results showed that the mechanical properties of the TPVs vulcanized by 2,5-dimethyl-2,5-di (tert-butyl peroxy) hexane (DBPH) first increased and then decreased with increasing the peroxide amount, while for dicumyl peroxide (DCP) vulcanizing system the mechanical properties slowly increased. Besides, the comprehensive mechanical properties vulcanized by DBPH were better than those of DCP group. The results of the thermogravimetric analysis showed that the TPVs vulcanized by DBPH had better heat stability, corresponding to the excellent thermo-oxidative aging performance and the 38% increase in tensile strength after aging. In addition, the MVQ rubber particles showed better dispersing performance for DBPH vulcanizing system. The melt flow rate of the TPVs showed a linear relationship with increasing DBPH dosage and became worse after the amount of crosslinking agent exceeded 1.5 phr. By comprehensive comparison, the TPVs have better performance when use peroxide DBPH as the crosslinking agent and the dosage is 1.5 phr. 相似文献
18.
采用动态硫化方法制备了混炼型聚氨酯橡胶(MPU)/聚十二内酰胺(PA 12)热塑性硫化胶(TPV),通过控制动态硫化时间探究了该TPV的动态硫化历程,同时研究了不同动态硫化阶段共混物的物理机械性能和动态力学性能。结果表明,随着动态硫化时间的延长,MPU/PA 12 TPV逐步完成相转变,在温度和剪切作用下,MPU相由连续相转变为分散相,而PA 12则由分散相转变为连续相;随着动态硫化时间的延长,MPU/PA 12共混物的储能模量升高,损耗模量降低,损耗因子减小。此外,随着动态硫化时间的延长,MPU/PA 12共混物的综合力学性能提高。 相似文献