共查询到19条相似文献,搜索用时 93 毫秒
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研究了三元乙丙橡胶(EPDM)改性聚丙烯共混物的性能,探讨了不同含量的EPDM和CaCO3,对共混物的力学性能,热性能,流变性能的影响,获得了性能较好的改性的PP共混物。 相似文献
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对聚丙烯(PP)/三元乙丙橡胶(EPDM)共混合金的结构与性能进行了研究。结果表明:国产三元乙丙橡胶J3080P能够大幅度提高PP的常温和低温缺口冲击强度;PP基体的性质和EPDM的用量对增韧效果有明显影响。PP/EPDM共混合金发生脆韧转变所需的EPDM用量为20~30份。EPDM对PP增韧机理遵从银纹-剪切带机理。J3080P对PP的增韧效果优于日本产EPDM 501A。 相似文献
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采用熔融共混法制备了聚丙烯/三元乙丙橡胶(PP/EPDM)共混物,利用力学性能测试、SEM和TG分析等手段考察了抗氧剂对共混物热氧稳定性、光稳定性、力学性能和微观结构的影响。结果表明:抗氧剂1010和抗氧剂168的加入,提高了PP/EPDM共混物的耐候性,细化了分散相的尺寸,改善了共混物的力学性能。 相似文献
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研究了动态硫化共混型热塑性弹性体EPMD/PP,确定了其最佳橡塑化,适合此体系的PP,硫化剂种类用量,硫化时间,温度。结果表明:最佳橡塑比为65/35,硫化时间10min,温度为180℃,硫化体系以硫磺硫化体系较好,硫化剂用量为1.5份。 相似文献
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动态硫化PP/HDPE/EPDM三元共混物的流变性能 总被引:1,自引:0,他引:1
本文采用不同的硫化剂,不同的硫化时间,对动态硫化的PP/HDPE/EPDM三元共混物的流变性能进行了研究。结果表明:1共混体系为假塑体,表现出切力变稀现象;2在低剪切应力下,以M为硫化剂的粘度与纯机械共混体系的粘度有很大差值,此差值随剪切应力的提高迅速减少;3以DCP为硫化剂,体系的粘度低于纯机械共混体系的粘度。 相似文献
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接枝PP/PET共混物的结构与性能 总被引:7,自引:0,他引:7
采用PP接枝马来酰亚胺(PP-g-MI)与PET熔融共混,用DSC,PLM,SEM等方法对共混物进行表征,结果表明,随着PP-g-MI接枝率的增加,共混物中PET的冷结晶温度降低,PP-g-MI与PET的相容性较PP与PET的相容性有了大幅度提高,同时PP-g-MI改善了PET的结晶性能,接枝PP在PET连续相中分散均匀,粒子尺寸小,分散相互连续相之间有较好的粘接作用。 相似文献
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EPDM/PP热塑性弹性体的制备及性能研究 总被引:3,自引:0,他引:3
以充油三元乙丙橡胶(EPDM),粉状聚丙烯(PP)、超细活性滑石粉为基本材料,采用动态硫化法在单螺杆挤出机组上制备EPDM/PP共混型热塑性弹性体(TPV);用力学性能试验及动态热流变仪方法测定了EPDM/PP-TPV的性能。结果表明,当EPDM充油量为20%-30%时,EPDM与PP熔融共混效果好;DCP用量为1.2%-1.5%时,EPDM/PP共混体系达到完全动态硫化;超细滑石粉最佳添加量为1 相似文献
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PP/EPDM共混体系界面的研究 总被引:9,自引:2,他引:7
本文采用马来酸酐对三元乙丙橡胶(EPDM)进行熔融接枝改性,将性后的EPDM与聚丙烯(PP)共混,对PP/EPDM和PP/EPDM-g-MAH两种共混体系的界面状况进行了对比。运用Huggins参数、界面张力参数对界面状况进行了表征;运用扫描电镜(SEM)和偏光显微镜对共混物的冲击断口形貌以及结晶情况进行了观察与分析;探讨了界面状况与共混物力学性能以及流变性能间的关系。 相似文献
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对PP/BDS共混物的性能和微观结构进行了研究。研究结果表明,BDS树脂在PP树脂中具有良好的分散性,二者有一定的相容性。随着BDS含量的增加。PP/BDS共混物的光泽度,流动性冲击强度升高,拉伸性能下降,弯曲性能变化较小,与其他增韧剂相比,BDS对PP的增韧性能较好。 相似文献
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共混时间对反应性PP/EPDM合金性能的影响 总被引:2,自引:0,他引:2
通过凝胶含量测定、力学性能试验以及熔体流动性能测试等手段,研究了共混(反应)时间对密炼法和挤出法反应性PP/EPDM共混合金性能的影响及其机理。结果显示,适当延长共混(反应)时间不仅能提高合金中EPDM的交联程度,而且还能使交联EPDM颗粒粒径变小、粒度均匀、在PP连续相中的分布均匀性增加,从而有效地提高该合金的增韧效果及其他力学性能,提高合金的加工流动性。 相似文献
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《国际聚合物材料杂志》2012,61(12):1169-1183
ABSTRACT This article discusses some properties such as tensile properties, chemical and oil resistance, gel content, crystallinity, and morphology of polypropylene (PP)/ethylene-propylene diene terpolymer (EPDM)/natural rubber (NR) blends. Dicumyl peroxide (DCP) was applied as a crosslinking agent. In terms of tensile properties, peroxide vulcanized blend shows higher tensile strength and tensile modulus (stress at 100% elongation, M100) as compared with the unvulcanized blend. The elongation at break of the peroxide vulcanized blend is higher for the blend with NR rich content compared with the EPDM rich content. The improvements in chemical and oil resistance as well as gel content of peroxide vulcanized blends have also proved the formation of crosslinks in the rubber phase. Scanning electron microscopy (SEM) micrographs from the surface extraction of the blends support that the crosslinks have occurred during dynamic vulcanization. Dynamical vulcanization with DCP has decreased the percent crystallinity of blends that can be attributed to the formation of crosslinks in the rubber. 相似文献
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研究了丙烯酸接枝聚丙烯(PP—g-AA)作为增容剂对聚丙烯(PP)/环氧化三元乙丙橡胶(eEPDM)共混体系形态和性能的影响。结果表明,在以PP为连续相而eEPDM为分散相时,PP—g-AA的加入大大提高了两相间的相容性,导致eEPDM分散相的细化;PP—g-AA中的羧基与eEPDM中的环氧基团发生了化学反应,形成了接枝共聚物,降低了PP/eEPDM之间的界面张力,起到了很好的界面增容剂的作用,对共混体系韧性的提高非常有利。 相似文献
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采用过氧化二异丙苯(DCP)降解PP/POE共混物。熔体流动速率试验结果表明,当DCP含量从0.2‰(质量分数,下同)增加到1‰时,对应的共混物的熔体流动速率从7.0g/10min增加到17.2g/10min,二者基本成线性关系。并且这种增加(相对分子质量的降低)导致其冲击性能从125J/m下降到50J/m;拉伸实验结果表明,共混物相对分子质量的降低对其屈服应力影响不大,这说明相对分子质量的降低主要是引起基体断裂应力的降低,从而导致共混物的冲击强度大大降低;通过扫描电子显微镜观察了不同相对分子质量共混物中橡胶相的分散情况,结果表明,随着DCP含量的增加,共混物中橡胶相的相区尺寸明显增加。因此,共混物冲击强度的降低是基体相对分子质量降低与橡胶相粒径变化共同作用的结果。 相似文献
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Kiril P. Tchomakov Basil D. Favis Michel A. Huneault Michel F. Champagne Florin Tofan 《加拿大化工杂志》2005,83(2):300-309
The ternary blends of high‐density polyethylene (PE), EPDM terpolymer and polypropylene (PP) have been used as a model low interfacial tension system to study encapsulation dynamics in ternary blends and their relation to the blends' mechanical properties. It was found that the modulus, tensile strength and impact resistance can be improved by PE addition if the PE is localized within the EPDM phase. A range of blend morphology was found depending on the PE viscosity and polymer incorporation sequence in the twin‐screw extruder. In the most favorable sequence, PE and EPDM were mixed together prior to their dispersion in the PP matrix. This practice resulted in a 50% increase in impact resistance when compared to mixing the three components in a single‐step. 相似文献
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采用动态全硫化方法制备三元乙丙橡胶(EPDM)/聚丙烯(PP)热塑性弹性体(TPV),研究剪切强度、硫黄用量、促进剂TMTD用量和并用促进剂DM对相反转及TPV物理性能的影响。结果表明:提高剪切强度(转速)有利于相反转发生,但转速过高会使相反转失败,TPV综合物理性能随着转速提高呈现先减小后增大的趋势;适当增大硫黄或促进剂TMTD用量均对TPV的相反转过程产生促进作用,并使反转时间缩短;给定促进剂TMTD用量,硫黄用量对相反转的促进作用存在最佳值,反之亦然;给定硫黄/促进剂TMTD用量,并用促进剂DM会使相反转时间延长甚至失败。 相似文献
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Halimatuddahliana H. Ismail H. Md. Akil 《Polymer-Plastics Technology and Engineering》2013,52(8-9):1429-1442
Blends of polypropylene (PP)/ethylene-propylene diene terpolymer (EPDM)/natural rubber (NR) with different ratio were investigated using a Haake torque rheometer. The effect of N,N-m-phenylene bismaleimide (HVA-2) addition on the flow behavior of PP/EPDM/NR blends also was studied. The torque data was collected at different rotor speeds in the range of 30–60 rpm and different processing temperatures in the range of 170–190°C. The recorded data were interpreted in terms of apparent shear rate, apparent shear stress, and apparent viscosity. The shear stress–shear strain curve shows that all blends follow the power law where the pseudoplasticity behavior of melt viscosity increases with increasing NR content as well as addition of HVA-2. The apparent viscosity of the blends was found to increase with increasing NR content in the blend. The addition of HVA-2 increases the apparent viscosity due to the formation of cross-linking in rubber phase. However, blends with HVA-2 show lower flow activation energies than do similar blends without HVA-2. Scanning electron microscopy (SEM) shows good correlation with the flow properties of the blends. 相似文献
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《国际聚合物材料杂志》2012,61(12):1065-1073
Dynamically vulcanized thermoplastic elastomer (TPE) blends were first described by Fisher. In the 1960s, the usage of TPE was low. However, the consumption of TPE is increasing today. Due to hard and soft polymer phases in its structure, TPE replaced a lot of materials. TPE materials are preferred today due to their good thermal properties, oxidation resistance, transparency, adhesion, compatibility with other polymers etc. As a result of the studies that were done in 1975, TPV—vulcanized thermoplastic elastomers were developed. In this study, TPV elastomers were produced by forming crosslinks with peroxide from different ratios, of EPDM and PP. Mixing was done with twin screw extruder. After that yield and tensile strength, the modulus of elasticity, % elongation, Izod impact strength, hardness, Melt Flow Index (MFI), Vicat Softening Point, Heat Deflection Temperature (HDT), and density of crosslinks were determined. Thermal transition temperatures and microstructure were determined with DSC and SEM, respectively. 相似文献