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考察了过氧化二异丙苯(DCP)并用助交联剂三烯丙基异氰脲酸酯(TAIC),三烯丙基氰脲酸酯(TAC)和N,N′-间苯撑双马来酰亚胺(HVA-2)和硫黄硫化体系对不同共混比的HNBR/EPDM共混胶力学性能的影响,并分析了两种橡胶的共硫化特性和相容性。结果表明,硫黄硫化胶的拉伸强度和拉断伸长率明显高于过氧化物硫化胶。过氧化物硫化EPDM时有较高硫化效率,而硫黄硫化HNBR时有较高硫化效率。在过氧化物硫化体系下,助交联剂TAIC,TAC和HVA-2对共混胶力学性能的影响差异不大;HNBR和EPDM为不相容体系,但在过氧化物硫化体系下有较好共硫化性。 相似文献
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TPU/EPDM共混体系相态与力学性能的研究 总被引:1,自引:0,他引:1
从亚微相态和拉伸性能出发,对比了TPU/EPDM和TPU/EPDM/POE-g-MAH多相共混体系。结果发现:当EPDM添加量控制在较为适宜的范围时,由于形成了网状结构,TPU/EPDM体系拉伸强度明显提高。在EPDM添加量为10%时,共混体系的拉伸强度达到最大。还讨论了EPDM的加入对TPU流变性能的影响。 相似文献
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研究了共混时间和5种共混方法对动态硫化EPDM(乙烯/N烯/二烯共聚物)/PP的结晶相态结构及力学性能的影响。结果表明,随着共混时间的延长。EPDM/PP体系的力学性能先变好后变差。当共混时间为5min时EPDM/PP体系的力学性能最佳;无论是采用哪种共混方法,均能形成完全硫化的弹性体相,但力学性能差别明显。 相似文献
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研究IIR/EPDM体系中共混比、硫黄硫化体系对其共混胶性能的影响。结果表明 ,IIR与EPDM共混相容性较好 ,可以达到共硫化 ;IIR/EPDM共混比为 75 /2 5时共混胶性能最好 ;用传统硫化体系 (CV)、有效硫化体系 (EV)和半有效硫化体系 (SEV)都能得到性能较好的共混胶 ,其中以CV体系的硫化胶性能最好。 相似文献
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主要探讨了EPDM/CPE并用比、阻燃剂(Sb2O3、十溴联苯醚)的配比、填料品种及用量、硫化剂DCP及助交联剂TAIC等因素对EPDM/CPE并用胶料力学性能、阻燃性能及电性能的影响,结果表明:选择EPDM40,CPE60.3PbO1.2,2PbO1.2,DCP2~3,TAIC1,滑石粉30,Sb2O310~15,ZR-1020~30,SA1,ZnO5,可制得综合性能较好的EPDM/CPE并用胶 相似文献
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《国际聚合物材料杂志》2012,61(7):743-758
Blends of chlorobutyl rubber (CIIR) with two grades of ethylene-propylene diene monomer rubber (EPDM) were prepared and the effect of blend ratio on the cure characteristics, hot air ageing resistance, steam ageing resistance, and mechanical properties were evaluated. The blend of CIIR with EPDM grade 301 T showed additive behavior and the blend with the other grade of EPDM (NDR 4640) showed synergistic behavior. 相似文献
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The effect of repetitive processing on the mechanical properties and fracture toughness of dynamically vulcanized isotactic polypropylene/ethylene‐propylene‐diene rubber blends (TPVs) with and without addition of β‐nucleating agent (β‐NA) was studied. The results showed that the repetitive processing did not cause much loss in the mechanical properties of TPVs, especially for TPVs with β‐NA, and TPVs with β‐NA showed better performance stability than TPVs without β‐NA. Essential work of fracture (EWF) approach was used to study the fracture behavior, and the results showed that the value of we (the specific essential work of fracture) of TPVs without β‐NA showed a significant decrease while that of TPVs with β‐NA almost kept constant after repetitive processing. Differential scanning calorimetry and wide‐angle X‐ray diffraction were used to study the variation of crystalline structures, and the results indicated that the repetitive processing showed no significant influence on the crystalline structures of TPVs, and the β‐NA maintained high‐nucleating efficiency after repetitive processing. © 2010 Wiley Periodicals, Inc. J Appl Polym Sci, 2010 相似文献
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Simple blending of natural rubber/ethylene–propylene–diene rubber (NR/EPDM) generally results in inferior mechanical properties because of curative migration and their differences for filler affinity. In this work, the 70/30 and 50/50 NR/EPDM blends prepared by reactive processing techniques were investigated and compared with the simple, nonreactive blends. The reactive blend compounds were prepared by preheating EPDM, containing all curatives to a predetermined time related to their scorch time prior to blending with NR. For the 70/30 gum blends, four types of accelerators were studied: 2,2‐mercaptobenzothiazole (MBT), 2,2‐dithiobis‐ (benzothiazole) (MBTS), N‐cyclohexyl‐2‐benzothiazolesulfenamide (CBS), and N‐tert‐butyl‐2‐benzothiazolesulfenamide (TBBS). When compared with the simple blends, the reactive blends cured with CBS and MBTS showed a clearly improved tensile strength whereas the increase of tensile strength in the blends cured with TBBS and MBT was marginal. However, a dramatic improvement of ultimate tensile properties in the reactive 50/50 NR/EPDM blends cured with TBBS was observed when compared with the simple blend. For the N‐550‐filled blends at the blend ratios of 70/30 and 50/50, the reactive‐filled blends prepared under the optimized preheating times demonstrated superior tensile strength and elongation at break over the simple blends. The improved crosslink and/or filler distribution between the two rubber phases in the reactive blends accounts for such improvement in their mechanical properties. This is shown in the scanning electron micrographs of the tensile fractured surfaces of the reactive blends, which indicate a more homogeneous blend. © 2008 Wiley Periodicals, Inc. J Appl Polym Sci, 2009 相似文献
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trans-Polyoctylene rubber (TOR) was melt blended with an incompatible NR/EPDM (70/30) blend. Mixing torque and temperature were reduced as TOR was added to NR/EPDM blend. The curing characteristics of the blend were affected as TOR participated in vulcanization and became a part of network. A scanning electron micrograph demonstrated that addition of TOR improved the compatibility of the blend and thereby led to a finer phase morphology. The ozone resistance of the blends was determined in terms of a critical stress–strain parameter. The critical stored energy density for ozone cracking was significantly enhanced for the TOR containing rubber blend. It was believed that the improvement in ozone resistance arised from finely dispersed ozone-resistant EPDM particles in the blend. TOR caused an improvement in dynamic properties and an increase in tensile modulus, but a decrease in tensile stress and elongation at break of the rubber blend. © 1999 John Wiley & Sons, Inc. J Appl Polym Sci 73: 749–756, 1999 相似文献
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Blends of two polyethylenes and an elastomer were prepared to investigate the effect of the latter polymer. The blends contain equal parts of low density (LDPE) and linear low density polyethylene (LLDPE), and ethylene–propylene–diene rubber (EPDM) with variable content ranging from 0 to 17.5%. Melt-mixed blends were prepared using a single-screw extruder. The influence on the mechanical properties of the following factors were analyzed: EPDM content, stretching rate in the range from 10 to 750 mm/min, and two cooling conditions. From the equilibrium torque the miscibility was analyzed. The structure exhibited by the stress–strain (–) curve of the polyethylenes blend is reduced with the addition of the elastomeric phase, and the ultimate properties increase because the amorphous phase becomes softer and reduces its capability to transmit the applied stress to the crystalline particles. The slope of the – curve in the strain hardening region shows a maximum value at the stretching rate ∼ 50–80 mm/min, which is explained partially in terms of the strain-induced crystallization of the polyethylene components. © 1997 John Wiley & Sons, Inc. J Appl Polym Sci 65: 677-683, 1997 相似文献
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F. Abd‐El Salam M. H. Abd‐El Salam M. T. Mostafa M. R. Nagy M. I. Mohamed 《应用聚合物科学杂志》2003,90(6):1539-1544
The effect of the vulcanizing system on the mechanical properties of butyl rubber/ethylene propylene diene monomer–general purpose furnace black–(GPF) blends was studied with static and dynamic mechanical measurements for these blends. The classical theory of elasticity was applied to show the mechanical behavior of the rubber–polymer blend and to calculate the degree of crosslinking. From the dynamic mechanical measurements, the elastic modulus, internal friction, and thermal diffusivity were calculated. The observed variations were explained in view of the role played by both the vulcanizing system and the reinforcing carbon black. © 2003 Wiley Periodicals, Inc. J Appl Polym Sci 90: 1539–1544, 2003 相似文献