共查询到19条相似文献,搜索用时 171 毫秒
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采用硫黄硫化体系和过氧化物(硫化剂DCP)硫化体系对EPDM/NR并用胶实施复合交联,考察了不同共混比EPDM/NR共混胶的硫化特性、硫化胶的物理机械性能、耐水性及耐溶剂性能。结果表明:复合交联后,胶料的硫化特性、物理机械性能均有所提高;EPDM母炼胶中DCP的用量要高于NR;胶料共混比为80/20(EPDM/NR),其耐水性和耐溶剂性能达到最佳。 相似文献
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探讨了三元乙丙橡胶(EPDM)和环氧化天然橡胶(ENR)的共混比、加料顺序、硫化体系对EPDM/ENR共混物的硫化特性、力学性能和耐热空气老化性能的影响。结果表明,共混比不同,共混胶的性能均有差异,且共混物的力学性能低于单组分的线性加和值,但综合比较而言,当EPDM/ENR=40/60时共混胶的力学性能较好;在所研究的四种加料顺序中,以配合剂先与EPDM制成母炼胶后再与ENR共混的这一种加料顺序下所得的共混物硫化胶的力学性能最好;采用半有效硫化体系所制得的共混物硫化胶的力学性能较好。 相似文献
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采用环氧化天然橡胶(ENR25和ENR45)改性陶土,通过对混炼胶结合胶质量分数、硫化胶表观交联密度、补强性能和力学性能的测定,研究了ENR与陶土的相互作用,ENR的环氧化程度及ENR的用量对陶土和填充NR硫化胶结构与性能的影响。结果表明,ENR可提高陶土与NR间界面的作用强度,提高混炼胶的结合胶质量分数,增大硫化胶的表观交联密度,改善硫化胶的网络结构,提高陶土填充NR硫化胶的力学性能,其中ENR25对陶土的改性效果优于ENR45。 相似文献
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微生物脱硫胶粉/天然橡胶共混胶的性能 总被引:3,自引:1,他引:2
用微生物提取物脱硫改性胶粉(RP),考察了脱硫胶粉(DRP)用量对其与天然橡胶(NR)共混胶的硫化性能、动态力学性能以及物理机械性能的影响,并与RP/NR共混胶进行了对比.结果表明,DRP的加入提高了其与NR的交联程度;DRP/NR混炼胶的Payne效应较RP/NR混炼胶小;随着DRP用量的增加,DRP/NR硫化胶的储能模量降低,损耗因子增大;DRP/NR硫化胶的物理机械性能随着DRP用量的增加而下降,但优于RP/NR硫化胶;DRP在NR中的分散性较RP均匀,与NR的界面结合更强. 相似文献
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炭黑并用对NR/ENR共混胶力学性能及减震性能的影响 总被引:3,自引:0,他引:3
对比N660研究了N330/N660、N660/N990炭黑填充体系对天然橡胶(NR)/环氧化天然橡胶(ENR)共混胶力学性能、压缩疲劳生热性能及减震性能的影响,并采用橡胶加工分析仪(RPA)对其加工性能进行了分析。结果表明:N660/N330和N660/N990两种填充体系硫化胶的力学性能,基本上是单用一种炭黑所得硫化胶力学性能的加权平均;不同粒径炭黑并用均能使共混胶的贮能模量E′下降,并且有利于拓宽NR/ENR减震材料的减震范围;不同粒径炭黑并用有利于改善NR/ENR共混胶料的加工性能。 相似文献
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采用硫载体硫化剂4,4′-二硫化二吗啉(DTDM)对三元乙丙橡胶(EPDM)进行活性预处理,研究了活性预处理EPDM/天然橡胶(NR)并用胶的性能,并探讨了活性预处理EPDM对并用胶力学性能影响的机理。结果表明,预处理EPDM/NR并用胶的共硫化程度得到改善,并用硫化胶的力学性能提高;并用硫化胶的耐老化性能优于NR硫化胶,但比未处理EPDM/NR并用硫化胶差;并用胶只存在1个玻璃化温度的转变区,两相的相容性得到改善;在高温动态条件下,EPDM与DTDM发生活性反应,但未生成大量凝胶。 相似文献
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Effect of surface modification of silicon carbide nanoparticles on the properties of nanocomposites based on epoxidized natural rubber/natural rubber blends 下载免费PDF全文
Improvement of the properties of rubber nanocomposites is a challenge for the rubber industry because of the need for higher performance materials. Addition of a nanometer‐sized filler such as silicon carbide (SiC) to enhance the mechanical properties of rubber nanocomposites has rarely been attempted. The main problem associated with using SiC nanoparticles as a reinforcing natural rubber (NR) filler compound is poor dispersion of SiC in the NR matrix because of their incompatibility. To solve this problem, rubber nanocomposites were prepared with SiC that had undergone surface modification with azobisisobutyronitrile (AIBN) and used as a filler in blends of epoxidized natural rubber (ENR) and natural rubber. The effect of surface modification and ENR content on the curing characteristics, dynamic mechanical properties, morphology and heat buildup of the blends were investigated. The results showed that modification of SiC with AIBN resulted in successful bonding to the surface of SiC. It was found that modified SiC nanoparticles were well dispersed in the ENR/NR matrix, leading to good filler‐rubber interaction and improved compatibility between the rubber and filler in comparison with unmodified SiC. The mechanical properties and heat buildup when modified SiC was used as filled in ENR/NR blends were improved. © 2017 Wiley Periodicals, Inc. J. Appl. Polym. Sci. 2017 , 134, 45289. 相似文献
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P. L. Teh Z. A. Mohd Ishak A. S. Hashim J. Karger‐Kocsis U. S. Ishiaku 《应用聚合物科学杂志》2004,94(6):2438-2445
Onium modified montmorillonite (organoclay) was compounded with natural rubber (NR) in an internal mixer and cured by using a conventional sulfuric system. Epoxidized natural rubber with 50 mol % epoxidation (ENR 50) in 10 parts per hundred rubber (phr) was used as a compatibilizer in this study. For comparison purposes, two commercial fillers: carbon black (grade N330) and silica (grade vulcasil‐S) were used. Cure characteristics were carried out on a Monsanto MDR2000 Rheometer. Organoclay filled vulcanizate showed the lowest values of torque maximum, torque minimum, scorch, and cure times. The kinetics of cure reaction showed organoclay could behave as a cocuring agent. The mechanical testing of the vulcanizates involved the determination of tensile and tear properties. The improvement of tensile strength, elongation at break, and tear properties in organoclay filled vulcanizate were significantly higher compared to silica and carbon black filled vulcanizates. In terms of reinforcing efficiency (RE), organoclay exhibited the highest stiffness followed by silica and carbon black filled vulcanizates. Scanning electron microscopy revealed that incorporation of various types of fillers has transformed the failure mechanism of the resulting NR vulcanizates compared to the gum vulcanizates. Dynamic mechanical thermal analysis (DMTA) revealed that the stiffness and molecular relaxation of NR vulcanizates are strongly affected by the filler–rubber interactions. © 2004 Wiley Periodicals, Inc. J Appl Polym Sci 94: 2438–2445, 2004 相似文献
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Transparent nonporous membranes were prepared by blending natural rubber (NR) with epoxidized NR (ENR). These blend membranes were evaluated for the selective separation of chlorinated hydrocarbons from acetone. The flux and selectivity of the membranes were determined both as a function of the blend composition and feed mixture composition. Results showed that polymer blending method could be very useful to develop new membranes with improved permselectivity. Pervaporation properties could be optimized by adjusting the blend composition. NR/ENR 70/30 and NR/ENR 30/70 composition showed a decrease in flux and selectivity, whereas the 50/50 composition showed increased flux and increased selectivity. Chlorinated hydrocarbons permeated preferentially through all the tested membranes. The feed mixture composition also strongly influenced the pervaporation characteristics of the blend membranes. Permselectivity was found to depend on the molecular size of the penetrants. © 1999 John Wiley & Sons, Inc. J Appl Polym Sci 71: 2365–2379, 1999 相似文献
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Saman Ghaderzadeh Elnaz Esmizadeh Ali Vahidifar Ghasem Naderi Mir Hamid Reza Ghoreishy Tizazu H. Mekonnen 《乙烯基与添加剂工艺杂志》2021,27(4):855-867
A facile approach of using halloysite nanotubes (HNTs) was proposed to address the durability performance demands of natural rubber (NR)/ethylene propylene diene monomer rubber (EPDM) blends and to protect them from the deleterious effects of the service environment including ozone, chemicals, abrasion, and cyclic loading. The introduction of HNTs substantially improved the stability of NR/EPDM when exposed to ozone (over fourfold enhancement with the addition of 5 phr HNTs). Moreover, the HNT-filled NR/EPDM vulcanizates offered approximately 66% reduction in the solvent-mediated swelling in comparison to the unfilled sample. Fatigue life studies showed that the HNT-reinforced NR/EPDM composite could withstand 30% more cycles to failure than the un-reinforced NR/EPDM blend. The effect of various HNT loading on the morphological, mechanical, physical, and rheological properties of nanocomposite vulcanizates based on NR/EPDM was also investigated. The morphological investigations revealed that the introduction of HNT into the NR/EPDM rubber matrix caused a rough morphology in fracture surface and a well-dispersed structure was obtained with the addition of up to 5 phr of HNTs. These findings were further supported by rheological, mechanical, and thermodynamical results. 相似文献
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天然橡胶增韧聚氯乙烯的研究 总被引:1,自引:0,他引:1
采用未改性的标准天然橡胶(NR)作增韧剂,通过机械共混法制备增韧聚氯乙烯(PVC)复合材料,考察了NR和增容剂用量对PVC增韧效果以及力学性能的影响.结果表明:当NR用量为10份时,材料的冲击强度最高为24.87 kJ/m2;加入增容剂环氧化天然橡胶(ENR)后,材料的冲击强度随其用量的增加而增大,在ENR为5份时其冲击强度为69.86 kJ/m2;氯化聚乙烯(CPE)作增容剂时,其冲击强度先升后降,在4份时达到峰值103.93 kJ/m2;氯化橡胶(CNR)作增容剂在3份时,其冲击强度达到最佳值35.37 kJ/m2;增容增韧后共混物的拉伸强度普遍降低. 相似文献
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炭黑在天然橡胶/溶聚丁苯橡胶硫化胶中的分散及其对性能的影响 总被引:1,自引:0,他引:1
考察了溶聚丁苯橡胶(SSBR)用量、炭黑的种类及用量对天然橡胶(NR)/SSBR硫化胶动态力学性能和力学性能的影响.结果表明,炭黑与SSBR的结合作用比与NR弱;随SSBR用量的增加,炭黑在NR/SSBR共混硫化胶中的分散性提高,Payne效应减弱,频率敏感性增强;随SSBR用量的增加,NR/SSBR共混硫化胶的拉伸强度和撕裂强度减小,扯断伸长率变化不大;而定伸应力则呈先减小后增大的趋势;随不同种类的炭黑在NR/SSBR硫化胶中分散性的提高,定伸应力呈上升趋势,损耗因子和压缩生热呈减小趋势. 相似文献