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PA1010/MGEPR共混物的力学性能 总被引:3,自引:0,他引:3
尼龙1010是我国首创的一种性能优良的工程塑料,为提高其干戍 低温冲击韧性,用Brabender PLE331型塑化仪制备了PA1010/MGEPR共混物,讨论了配料方式,MGEPR用量,丁基橡胶用量,螺杆转速等对共混物冲击强度,拉伸强度等力学性能的影响,结果表明,如采用PA1010/MGEPR(2)和PA1010/MGEPR(4)共混体系,则冲击强度较PA1010有明显提高,当螺转速为37r/min-47r/min时,混合效果较好,当丁基橡胶为乙丙橡胶(EPR)含量的10%(质量)时,共混物的冲击强度优良。 相似文献
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本文用动态硫化法,在Brabender塑化仪上对高密度聚乙烯(HDPE)/氯化丁基橡胶(CIIR)的配比、硫化剂用量以及混合时间、温度和速度进行了考察,制得了不同橡塑比和不同硫化剂用量的HDPE/CIIR共混物。结果表明;少量HDPE可赋予共混物远高于硫化CIIR的机械强度:硫化剂用量达15phr时,共混物仍具有热塑性;动态硫化增强了共混物的强度和弹性,HDPE/CIIR=30/70的动态硫化共混物具有最佳综合机械性能。 相似文献
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崔永岩朱晓蒙杨翰高文敬段盛元 《高分子材料科学与工程》2018,(11):74-78
研究了动态硫化对丙烯腈-丁二烯-苯乙烯/甲基乙烯基硅橡胶(ABS/MVQ)共混体系性能的影响,讨论了不同含量硫化剂对ABS/MVQ共混物流变性、耐热性、力学性能和微观结构的影响。结果表明,动态硫化使共混体系黏度增大,流体假塑性增强,流动性下降;在一定范围内,随着硫化剂2,5-二甲基-2,5-双(叔丁基过氧化)己烷(DHBP)用量的增大,共混体系的耐热性和力学性能表现出先增大后减小的趋势;动态硫化使ABS/MVQ体系的相容性变好,成炭量增加;当硫化剂含量为0.04%时,ABS/MVQ体系综合性能最好。 相似文献
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《高分子材料科学与工程》2018,(11)
研究了动态硫化对丙烯腈-丁二烯-苯乙烯/甲基乙烯基硅橡胶(ABS/MVQ)共混体系性能的影响,讨论了不同含量硫化剂对ABS/MVQ共混物流变性、耐热性、力学性能和微观结构的影响。结果表明,动态硫化使共混体系黏度增大,流体假塑性增强,流动性下降;在一定范围内,随着硫化剂2,5-二甲基-2,5-双(叔丁基过氧化)己烷(DHBP)用量的增大,共混体系的耐热性和力学性能表现出先增大后减小的趋势;动态硫化使ABS/MVQ体系的相容性变好,成炭量增加;当硫化剂含量为0.04%时,ABS/MVQ体系综合性能最好。 相似文献
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为了获得具有较好压阻稳定性和重复性的力敏复合材料,在炭黑/硅橡胶复合体系中加入纳米氧化钌,完善补充导电相的同时加固硅橡胶交联网络。采用溶剂热还原法制备金属钌纳米颗粒,在空气中热氧化,得到尺寸为数十纳米的氧化钌颗粒;采用溶剂共混的方法制备炭黑/硅橡胶共混胶,用研磨分散的方法将纳米二氧化钌加入炭黑/硅橡胶共混胶中,硫化成型后得到氧化钌(RuO2)-炭黑(CB)/硅橡胶(MVQ)双导电相复合材料。采用自建的压阻性能测试系统测试了复合材料的压阻性能,测量结果表明,CB/MVQ体系中加入一定用量的RuO2其压阻重复性变好,压阻蠕变性得到改善;用扫描电镜、透射电子显微镜分析了复合材料的微观结构,并用能谱分析结合电子衍射图证明了纳米氧化钌以纳米结构存在于复合材料中,丰富和完善了炭黑导电网络,加固了硅橡胶交联网络,这些因素是导致压阻重复性提高的主要因素。 相似文献
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通过熔融共混法制备了不同聚ε-己内酯含量的聚乳酸/聚丁二酸丁二醇酯/聚ε-己内酯(PLA/PBS/PCL)共混物,采用X射线衍射仪、热重分析仪、流变仪和万能试验机等对PLA/PBS/PCL共混体系的结晶性能、热稳定性、流变行为和力学性能进行了研究。结果表明,PCL的加入未改变共混物的结晶结构;加入PCL后,共混物的起始分解温度(Ti)和分解终止温度(Tf)显著提高,当PCL用量为3 phr时,共混物的Ti和Tf分别提高了27.14℃和23.31℃;当PCL用量不超过2 phr时,PCL对共混体系主要起增容作用,PLA与PBS之间的相容性得到改善;随着PCL用量的增加,共混物的拉伸强度呈先增加后减小的趋势,PCL用量为2 phr时,达到最大值69.3 MPa,冲击强度呈增加的趋势,PCL用量为3 phr时,达到最大值5.59 k J/m2,较PLA/PBS共混物分别增加了35.4%和76.9%。 相似文献
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通过熔融共混法制备了不同聚ε-己内酯含量的聚乳酸/聚丁二酸丁二醇酯/聚ε-己内酯(PLA/PBS/PCL)共混物,采用X射线衍射仪、热重分析仪、流变仪和万能试验机等对PLA/PBS/PCL共混体系的结晶性能、热稳定性、流变行为和力学性能进行了研究。结果表明,PCL的加入未改变共混物的结晶结构;加入PCL后,共混物的起始分解温度(Ti)和分解终止温度(Tf)显著提高,当PCL用量为3 phr时,共混物的Ti和Tf分别提高了27.14℃和23.31℃;当PCL用量不超过2 phr时,PCL对共混体系主要起增容作用,PLA与PBS之间的相容性得到改善;随着PCL用量的增加,共混物的拉伸强度呈先增加后减小的趋势,PCL用量为2 phr时,达到最大值69.3 MPa,冲击强度呈增加的趋势,PCL用量为3 phr时,达到最大值5.59 k J/m2,较PLA/PBS共混物分别增加了35.4%和76.9%。 相似文献
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聚乙烯/硅橡胶共混膜的制备及其透气性能 总被引:2,自引:0,他引:2
为了提高聚乙烯薄膜的透气性能,采用挤出吹塑的方法制备了硅橡胶(聚二甲基硅氧烷,PDMS)含量为1%~5%的聚乙烯(PE)/硅橡胶共混薄膜,用扫描电镜研究了硅橡胶在聚乙烯中的分布,测试了共混膜的透气性能。结果表明,由于吹膜过程中的拉伸作用,硅橡胶颗粒呈细长型分布于聚乙烯基体中,硅橡胶的加入并不能明显改善聚乙烯的透气性能。... 相似文献
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Conductive rubber composites from different blends of ethylene-propylene-diene rubber and nitrile rubber 总被引:2,自引:0,他引:2
Conductive rubber composites were derived from different blends of ethylene-propylene-diene monomer (EPDM) rubber and acrylonitrile
butadiene rubber (NBR) containing acetylene black. The electrical and mechanical properties of these composites were measured.
The percolation limit for achieving high conductivity of conductive filler depends on the viscosity of the blend. The higher
the viscosity, the higher is the percolation limit. The conductivity rises with increasing temperature, and the activation
energy of conduction increases with the decrease in the loading of conductive filler and percentage of NBR in the blend. Electrical
hysteresis and an electrical resistivity difference during the heating-cooling cycle are observed for these systems, which
is mainly due to some kind of irreversible change occurring in the conductive networks during heating. The mechanisms of conduction
of these systems were discussed in the light of different theories. It was found that the degree of reinforcement by acetylene
black in blends compares with those in the pure components NBR and EPDM. This is due to incompatibility of two elastomers
in the blend.
This revised version was published online in November 2006 with corrections to the Cover Date. 相似文献
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Devulcanized rubber waste produced from end-of-life passenger tyres by continuous shear flow stage control reaction technology was used both as filler and as part of rubber in a natural rubber matrix to develop the use of the rubber compound and lower the cost. The measurements of cure characteristics, swelling behaviour, crosslink density and dynamic and mechanical properties were carried out in our laboratory. In the present study it was found that using devulcanized rubber as part of rubber yields much better properties than using it as filler. Up to 15 phr devulcanized rubber used as filler and up to as much as 50 phr devulcanized rubber used as part of rubber can be incorporated in a new product without any noteworthy deterioration in performance arising. 相似文献
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M. T. Ramesan T. K. Manoj Kumar R. Alex B. Kuriakose 《Journal of Materials Science》2002,37(1):109-116
This paper focuses on the use of styrene butadiene rubber (SBR) as a viscosity modifier in novel blends of natural rubber (NR) and dichlorocarbene modified styrene butadiene rubber (DCSBR). The processing characteristics, vulcanisation kinetics, stress-strain behaviour, mechanical properties and low temperature transition of the blends have been examined in order to analyse the influence of SBR in the blends. The change in cross-link density values from stress strain behaviour and equilibrium swelling data has been correlated with the technological properties of the blends. The excellent mechanical properties and the increased cross-link density in blends in the presence of 5—10 phr of styrene butadiene rubber reveals the viscosity modifying action of SBR in NR/DCSBR blends. The variation in viscosities of these blends with the addition of SBR is reflected in the DSC thermograms. The resulting blends show very high resistance to thermal ageing as compared to those without SBR. 相似文献
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Jia Z Luo Y Yang S Du M Guo B Jia D 《Journal of nanoscience and nanotechnology》2011,11(12):10958-10962
The reinforcement effects of halloysite nanotubes on styrene-butadiene rubber and the modification effect of epoxidized natural rubber on styrene-butadiene rubber/halloysite nanotubes composites were studied. The structure, morphology and properties of styrene-butadiene rubber/halloysite nanotubes composites before and after the incorporation of epoxidized natural rubber were investigated. The results indicated that epoxidized natural rubber can promote the dispersion and orientation of halloysite nanotubes in styrene-butadiene rubber matrix at nanoscale and strengthen interfacial combination between halloysite nanotubes and styrene-butadiene rubber by the formation of covalent bonds and hydrogen bonds between epoxidized natural rubber and halloysite nanotubes. Consequently epoxidized natural rubber can improve the mechanical properties of the vulcanizates of styrene-butadiene rubber/halloysite nanotubes composites. Besides epoxidized natural rubber can decrease the rolling resistance of the vulcanizates and increase the wet grip property of the vulcanizates. 相似文献
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采用环保型水切割胶粉及力化学改性胶粉(MRP)与天然橡胶(NR)复合制备胶粉-NR复合胶,并探讨了胶粉用量对复合胶力学性能和动态性能的影响。通过红外和热失重分析确定了胶粉的主要成分为NR和丁苯橡胶(SBR),且改性后胶粉大分子链结构未发生明显变化。通过橡胶加工分析仪研究了胶粉用量及改性对复合胶加工性能的影响。采用炭黑分散仪研究并观察了胶粉在NR中的分散情况。结果表明,胶粉改性后与NR的相容性提高,二者界面结合力增大,MRP-NR复合胶加工性能改善。炭黑分散结果表明,胶粉用量越多,其分散性越差,改性后胶粉的分散性提高,MRP-NR复合胶的力学性能最优,拉伸强度为27.9 MPa。 相似文献
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橡胶相尺度对亚微米或纳米橡胶颗粒填充环氧复合材料性能的影响 总被引:1,自引:0,他引:1
对比研究了由液体橡胶在环氧树脂中原位形成的亚微米橡胶/环氧复合材料和在环氧树脂中直接添加纳米橡胶颗粒形成的纳米橡胶/环氧复合材料的性能。研究表明:未固化混合物的黏度随着纳米橡胶相的加入逐渐增加,但随着亚微米橡胶相含量的增加而降低;橡胶/环氧复合材料的玻璃化转变温度随着纳米橡胶颗粒的加入逐渐增加,但随着亚微米橡胶相含量的增加而降低;两种橡胶相的添加均使复合材料的弹性模量降低,断裂延伸率增加;在较低含量时,纳米橡胶颗粒可以提高环氧的拉伸强度;两种橡胶填充的橡胶/环氧复合材料均显示出明显的增韧效果。微观形貌分析表明,两种橡胶均可以在应力作用下脱粘并促进裂纹尖端的塑性变形。 相似文献
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Kaushik Pal R. Rajasekar Dong Jin Kang Zhen Xiu Zhang Samir K. Pal Chapal K. Das Jin Kuk Kim 《Materials & Design》2010
The effect of fillers on morphology and wear characteristics are studied in butadiene rubber (PBR)/high styrene rubber (HSR)/natural rubber (NR) blends with different types of carbon black. SAF N110 with SRF N774 type of carbon black shows a significant effect on curing studies and mechanical properties by reacting at the interface between PBR, HSR and NR matrix. Blends containing the same carbon blacks show high abrasion resistant properties against Du-Pont abrader, DIN abrader and different mining rock surfaces and also is found to be the toughest rubber against all types of rock. 相似文献
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The validity of the widely-quoted experimental data for the reduced radial stiffness of a cylindrical rubber bush mounting of finite length is discussed by proposing an analogy between such a bush and two tandem cylindrical rubber blocks of circular cross-section which are axially loaded. Previously-derived expressions for the radial stiffness of a finite-length cylindrical bush and the apparent Young’s modulus of an axially-loaded bonded rubber block of circular cross-section are exploited. This leads to an adaptation of the data that incorporates the possible failure of the bushes due to internal rupture. The analytically-derived values of this stiffness are demonstrated to have improved agreement with these appropriately modified data. Representative numerical results are presented for a range of bushes in tabular and graphical forms. 相似文献