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NBR/EPDM的增容共混研究 总被引:4,自引:1,他引:4
本文采用第三组份增容途径,改善了NBR/EPDM并用胶的相容性、加工性和力学性能。通过对不同增容体系的研究对比,发现不同增容剂的增容效果差异很大,其巾以EVA-14增容效果最为显著,加入该增容剂的并用胶,在适当的工艺条件及硫化体系下,可获得最佳力学性能。本文还研究了不同增容剂对并用炭黑胶各种性能的影响,可以做到在不降低并用胶的力学性能的同时,提高并用胶的耐热空气老化、耐大气老化和耐臭氧老化性能.透射电镜实验和动态力学谱图证明了加与未加增容剂时,NBR/EPDM并用胶均为两相结构,增容剂起表面活性剂的作用,加强了两相界面间的相互作用,使分散相EPDM细微化和均匀化。 相似文献
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研究了增容剂二元乙丙橡胶接枝马来酸酐(EPM-g-MAH)和丁腈橡胶/甲基丙烯酸缩水甘油酯的共聚物(NBR-GMA)对NBR/EPDM共混胶力学性能和相形态结构的影响。结果表明,加入EPM-gMAH/NBR-GMA并用物后共混胶凝胶含量明显增大。随着增容剂用量的增大,共混胶相形态结构得到明显改善,力学性能有所提高,且共混胶的耐热性能好于耐油性能。共混胶DMA曲线表明,增容剂对NBR/EPDM共混胶有较好增容作用。 相似文献
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研究了不同并用质量比的氯化丁基橡胶/溴化丁基橡胶(CIIR/BIIR)共混胶的硫化特性、力学性能、老化性能和动态力学性能。结果表明,不同并用质量比的CIIR/BIIR共混胶相容性良好,仅有一个损耗因子(tan δ)峰,随着BIIR用量提高,共混胶的交联程度略降低,正硫化时间延长,硫化速率减慢,力学性能没有明显变化,玻璃化转变温度明显向高温偏移;当CIIR/BIIR并用质量比为90/10时,共混胶的动态力学性能达到最优,60℃的tan δ值比纯BIIR硫化胶降低19%。 相似文献
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MVQ-g-TFEMA对氟橡胶/硅橡胶共混胶的增容作用 总被引:1,自引:0,他引:1
通过高温力化学接枝法制备硅橡胶接枝甲基丙烯酸-2,2,2-三氟乙酯(MVQ-g-TFE-MA),作为氟橡胶/硅橡胶共混胶的增容剂。研究增容剂用量对氟橡胶/硅橡胶共混胶的力学性能、耐油性能和低温性能的影响,采用DMA研究共混胶中氟橡胶和硅橡胶的相容性。结果表明,添加的MVQ-g-TFEMA的质量分数为4.6%时,共混胶具有良好的力学性能。随着增容剂的质量分数从0增至11.5%,共混胶的耐油性能提高,脆性温度从-36.8℃下降至-48.3℃。DMA分析表明,增容剂MVQ-g-TFEMA改善了共混胶中氟橡胶和硅橡胶的相容性。 相似文献
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研究丁腈橡胶(NBR)/三元乙丙橡胶(EPDM)并用比对力学性能、老化性能和耐油性能的影响以及增容剂对共混胶性能的影响.结果表明,在NBR/EPDM共混胶中随EPDM用量的增加,硫化胶的硬度、拉伸强度、撕裂强度和定伸应力呈现下降趋势、拉断伸长率及耐低温性能有所改善,降低了NBR的耐汽油性能,但提高了耐含乙醇汽油性能.随着增容剂CM用量的增加,硫化胶拉伸强度、撕裂强度、100%定伸应力及硬度都呈增大趋势,采用扫描电镜可以清晰的看到添加CM改性后NBR/EPDM共混胶相容性得到显著改善. 相似文献
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本论文主要通过将4种增容剂CPE、NBR、BIIR、CIIR分别与CR/BR共混物制成混炼胶裁样、硫化、测性能的方式研究了增容剂对CR/BR共混物的相容性及其硫化胶性能的影响。结果表明:CR/BR共混物微观形态的SEM照片表明增容剂很好的改善了CR/BR共混物形态均匀性;其混炼胶焦烧时间延长,硫化速度加快,胶料流动性变好,但交联密度降低;硫化胶力学综合性能得到提升,拉伸强度、拉断伸长率和撕裂强度增加,定伸应力下降,硬度减小,弹性增加,耐热老化性提高。但尤以增容剂CIIR增容效果最好,有效的改善了共混橡胶的加工性能和使用性能。 相似文献
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研究了预硫化工艺下不同共混比对多官能化丁基橡胶/天然橡胶(MFIIR/NR)共混胶硫化特性、力学性能、耐老化性能以及微观形貌的影响,同时与传统工艺制备的共混胶的性能进行了对比。结果表明,当MFIIR作为主要组分时,预硫化法混炼胶的正硫化时间随MFIIR/NR共混比(质量比)的增大而缩短,最高转矩、最高转矩与最低转矩之差都随共混比的增大而呈现变小的趋势;随着预硫化法共混胶共混比的增大,共混胶的力学性能降低,耐老化性能提高,但都明显高于传统法共混胶的力学性能;预硫化共混胶拉伸断面的致密程度较传统法共混胶高,且随共混比的增大,拉伸断面的形貌趋于平坦。 相似文献
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硅橡胶和丁基橡胶共混体系的阻尼特性研究 总被引:1,自引:0,他引:1
采用机械共混法制备了硅橡胶/丁基橡胶复合材料。研究了丁基橡胶用量对复合材料力学性能、热稳定性和阻尼性能的影响。结果表明,随着丁基橡胶用量的增加,复合材料的力学性能和热稳定性出现降低的现象,但阻尼性能有显著提高。当丁基橡胶用量为100份时,与纯硅橡胶相比,复合材料的有效阻尼温域从0 ℃拓宽到近75 ℃,最大损耗因子从0.11提高到0.80,玻璃化转变温度向高温偏移了8 ℃左右。 相似文献
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Organic montmorillonite/brominated butyl rubber nanocomposites are prepared by improved solution blending, i.e., preparation of organic clay suspension and suspension blending with brominated butyl rubber solution by adding polytetramethylene ether glycol as interface agent. Scanning electron microscopy and atomic force microscopy show that polytetramethylene ether glycol has good dispersing effect on organic clay. Transmission electron microscopy and X-ray diffraction analysis demonstrates that both intercalated and exfoliated structures are obtained in organic montmorillonite/brominated butyl rubber nanocomposites. The mechanical performances and the gas barrier properties of the organic montmorillonite/brominated butyl rubber nanocomposites are improved greatly, which proves that the high-performance clay/rubber nanocomposites are prepared in nonpolar solvent. 相似文献
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研究天然橡胶(NR)/顺丁橡胶(BR)并用胶的硫化特性、物理性能及动态力学性能,确定适用于中长途载重轮胎胎面胶的NR/BR最佳并用比。结果表明:并用20phrBR为一个临界值,超过20phrBR时,硫化胶的抗裂口增长性能急剧下降;当NR/BR并用比为80/20时,并用胶的综合物理性能较好,损耗因子tanδ低,压缩永久变形小,耐磨性好,更适合应用于载重轮胎胎面。 相似文献
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共混比对丁腈橡胶/氯醚橡胶性能的影响 总被引:1,自引:0,他引:1
研究了共混比时常规共混及动态硫化共混丁腈橡胶(NBR)/氯醚橡胶(ECO)的力学性能及加工流变性能的影响。结果表明,共混比对NBR/ECO胶料的力学性能及加工流变性能影响显著。NBR经动态硫化后,压缩永久变形及挤出胀大明显减小,拉伸强度提高,表现黏度随ECO用量的增大而减小。共混比对常规共混胶的表观黏度影响不大。动态硫化有利于改善NBR/ECO胶料的加工性能。 相似文献
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Montmorillonite (MMT) was modified by ultrasound and castor oil quaternary ammonium salt intercalation method to prepare a new type of organic montmorillonite (OMMT). The surface structure, particle morphology, interlayer distance, and thermal behavior of the samples obtained were characterized. The modified OMMT was then added to chlorinated butyl rubber (CIIR) by mechanical blending, and a composite material with excellent damping properties was obtained. The mechanical experiment results of CIIR nanocomposites showed that the addition of OMMT improved their tensile strength, hardness, and stress relaxation rate. Compared with pure CIIR, when the content of OMMT was 5 phr (part per hundred of rubber), the tensile strength of the nanocomposite was increased by 677% and the elongation at break was also increased by 105.4%. The enhancement of this performance was mainly due to the dispersion of the nanosheets in CIIR rubber and the chemical interaction between the organoclay and the polymer matrix, which was confirmed by morphology and spectral analysis. OMMT also endowed a positive effect on the damping properties of CIIR nanocomposites. After adding 5 phr of OMMT, the nanocomposite owned the best damping performance, and the damping factor, tanδmax, was 37.9% higher than that of pure CIIR. Therefore, the good damping and mechanical properties of these CIIR nanocomposites provided some novel and promising methods for preparing high-damping rubber in a wide temperature range. 相似文献
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《Polymer-Plastics Technology and Engineering》2013,52(5):833-845
Thermoplastic elastomers have been prepared by blending polypropylene (PP), natural rubber (NR), and recycle rubber powder (RRP). The blends were melt-mixed using a Brabender Plasticorder torque rheometer at 190°C and 50 rpm. A fixed 70:30 blend ratio (wt%) of PP and rubber was prepared. The effect of partial replacement of NR with RRP at a fixed rubber content (NR+RRP), 30 wt% on mechanical properties, swelling behavior, torque development, and morphological properties of PP/NR/RRP blends was studied. Results show that the tensile strength, Young's modulus, and swelling resistance increase with increasing RRP content in the PP/NR/RRP blends whereas the stabilization torque and elongation at break exhibit opposite trend. 相似文献
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