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61.
The dependence of shear strength of epoxidized natural rubber (ENR)‐based adhesives on molecular weight of the rubber is studied using coumarone–indene resin, gum rosin, and petro resin as tackifiers. The adhesive was coated on polyethylene terephthalate (PET) film substrate using a SHEEN hand coater at various coating thickness. The shear strength of adhesives was determined by a Texture Analyzer. Results show a maximum at 6.63 × 104 and 4.14 × 104 for ENR 25 and ENR 50, respectively, after which the shear strength decreases with further increases in molecular weight for all the coating thickness. This observation is attributed to varying degree of cohesiveness which culminates at the respective optimum molecular weight of ENR. © 2009 Wiley Periodicals, Inc. J Appl Polym Sci, 2009 相似文献
62.
测量低噪声放大器的噪声系数 总被引:4,自引:0,他引:4
本文介绍了用噪声系数分析仪测量低噪声放大器的噪声系数的方法和原理。以Agilent N8975A噪声系数分析仪的使用为例,分析了Y系数法测量噪声系数的原理,和低噪声放大器测量的步骤与特殊性。 相似文献
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64.
Rohani Abdul Majid Razaina Mat Taib 《Polymer-Plastics Technology and Engineering》2018,57(15):1507-1517
The kenaf core powder (KCP) has been treated with benzoyl chloride (BC) in poly(vinyl chloride)(PVC)/epoxidized natural rubber (ENR)/KCP composites. The presence of BC grafted on KCP was evident by infrared analysis. PVC/ENR/KCP samples were prepared using Haake Polydrive with the temperature of 140°C and KCP loading of 5, 10, 15, and 20?phr. The processing, tensile and thermal properties of the composites were investigated. The enhancement of tensile properties showed that the treatment improved the interfacial adhesion between KCP with PVC/ENR matrix. Higher glass transition temperature and higher thermal stability after treatment with BC support the enhancement of the composites’ tensile properties. 相似文献
65.
研究了氢氧化镁、氧化锌及硬脂酸对环氧化天然橡胶(ENR)硫化特性、硫化胶的力学性能及老化性能的影响。结果表明:加入2份氢氧化镁可有效地提高ENR的硫化速度、拉伸强度和抗热氧老化性能;氧化锌和硬脂酸对硫化胶网络的完善是不可缺少的。用差示扫描量热法(DSC)比较了几种防老剂(防老剂D,H.WSP,MB.4010,SP)在ENR中的防护效果。结果表明防老剂D的效果最好。以防老剂D与防老剂MB并用,加入2份氢氧化镁、2份硬脂酸和5份氧化锌,不仅可缩短硫化时间,而且可大幅度提高硫化胶的拉伸强度、扯断伸长率和老化系数。 相似文献
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69.
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
70.
Gunasunderi Raju Chantara Thevy Ratnam Nor Azowa Ibrahim Mohammad Zaki Ab. Rahman Wan Md Zin Wan Yunus 《应用聚合物科学杂志》2008,110(1):368-375
Effect of oil palm empty fruit bunch (OPEFB) fiber and poly(methyl acrylate) grafted OPEFB on several mechanical properties of poly(vinyl chloride)/epoxidized natural rubber (PVC/ENR) blends were studied. The composites were prepared by mixing the fiber and the PVC/ENR blends using HAKEE Rheomixer at the rotor speed of 50 rpm, mixing temperature 150°C, and mixing period of 20 min. The fiber loadings were varied from 0 to 30% and the effect of fiber content in the composites on their ultimate tensile strength (UTS), Young's modulus, elongation at break, flexural modulus, hardness, and impact strength were determined. An increasing trend was observed in the Young's modulus, flexural modulus, and hardness with the addition of grafted and ungrafted fiber to the PVC/ENR blends. However the impact strength, UTS, and elongation at break of the composites were found to decrease with the increase in fiber loading. An increase in elongation at break and UTS and decrease in the flexural and Young's modulus was observed with the addition of PMA‐g‐OPEFB fiber compared to ungrafted fiber. This observation indicates that grafting of PMA onto OPEFB impart some flexibility to the blend. The morphology of cryogenically fractured and tensile fracture surfaces of the composites, examined by a scanning electron microscope shows that the adhesion between the fiber and the matrix is improved upon grafting of the OPEFB fiber. © 2008 Wiley Periodicals, Inc. J Appl Polym Sci, 2008 相似文献