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N. C. Dafader M. E. Haque F. Akhtar M. U. Ahmad 《Polymer-Plastics Technology and Engineering》2013,52(7):889-892
Blend rubber films were prepared by mixing styrene grafted rubber latex and natural rubber latex (NRL) with varying proportions by gamma radiation from Co-60 source at room temperature. Tensile strength, modulus at 500% elongation, elongation at break, permanent set, and swelling ratio were measured. Tensile strength and modulus at 500% elongation attain maximum at 8 kGy radiation dose for blend rubber films. The increase in tensile strength is insignificant, but modulus increases from 5.61 to 7.46 MPa with increased proportion of grafted rubber latex from 40 to 70% in the blend at this radiation dose. Elongation at break, permanent set, and swelling ratio of blend rubber decreases with increase in radiation dose as well as proportion of grafted rubber. 相似文献
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沥滤对天然胶乳胶膜性能的影响 总被引:1,自引:0,他引:1
沥滤是天然胶乳浸渍制品一种非常有用且重要的工艺。沥滤可降低胶膜中可溶性物质的含量,改善胶膜的物理性能,降低胶膜中蛋白质含量和亚硝胺含量,从而提高制品的质量。 相似文献
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M. A. Haque M. U. Ahmad F. Akhtar N. C. Dafader M. E. Haque 《Polymer-Plastics Technology and Engineering》2013,52(10):927-931
Variable compositions of natural rubber latex (NRL) and polyvinyl alcohol (PVA) have been blended. The contents of PVA in the blends were varied from 0.5 phr to 3.0 phr and the total solids contents of NRL was fixed to 50%. The blends were irradiated at different irradiation doses (0–20 kGy) in the presence of normal butylacrylate (n-BA). The permanent set; swelling ratio and elongation at break point of the blended films at all compositions decrease with the increase of radiation doses whereas increase is observed in cross-linking density, gel content, tensile strength and modulus. Sharp changes of all the properties were observed between 3–5 kGy radiation doses. On the other hand, at higher radiation doses, ≥ 5 kGy, the permanent set, swelling ratio, gel content did not show any appreciable change whereas cross-linking density, tensile strength, modulus and elongation at break point are changed. The maximum cross-linking density of blend is observed with 2.0 phr PVA at 12 kGy radiation. The highest value of modulus and tensile strength of the same blend are found at 10 kGy and 5 kGy respectively. Blends with 2.0 phr PVA for all compositions proved to be optimum for improving varies properties at 5–12 kGy radiation doses. 相似文献
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Preparation and Properties of Natural Rubber/Palygorskite Composites by Co-Coagulating Rubber Latex and Clay Aqueous Suspension 总被引:4,自引:0,他引:4
Shangyue Shen Mei Yang Songlin Ran Fang Xu Zongxia Wang 《Journal of Polymer Research》2006,13(6):469-473
Natural rubber (NR)/Palygorskite composites were prepared by co-coagulating rubber latex and clay aqueous suspension. Org-palygorskite was attained by using cetyltrimethylammonium bromide (CTAB) and the four factors influencing the average diameter of palygorskite were discussed. Four optimal conditions of preparing minimum average diameter were determined which included the concentration of palygorskite, the concentration of sodium polyacrylate, ultrasonic time and ultrasonic power. Mechanical properties suggested that composites using modified palygorskite which were dispersed by ultrasonic wave were the best, the tensile strength, tear strength, 300% modulus and shall hardness increased by 77.14%, 118.18%, 242.86% and 65.2%, respectively. Modified palygorskite was shown by FTIR spectrogram and observed by ESEM. Modified palygorskite dispersed by ultrasonic wave were dispersed into the rubble uniformly, some stick particles inserted into the rubber and it is difficult to find stick shape, and there were 20% particles belonging to nanomaterials and 80% micromaterials. 相似文献
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纳米材料改性苯丙乳液的制备研究 总被引:2,自引:0,他引:2
为检测纳米材料添加对苯丙乳液性能的影响并提高其在乳液中的稳定性,进行了纳米材料包裹剂的选择及用量、纳米材料用量及加入方式、不同纳米材料的对比等实验。发现当先采用硅烷偶联剂对纳米材料进行包裹,后分散于拥有大侧链基团的单体中的工艺时,乳液的硬度、粘度等参数均有不同程度的提高,其中耐水性提高近4倍。乳液的各项稳定性测试均达到一级,贮存稳定性达6个月以上。 相似文献
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采用Dunlop发泡法制备天然胶乳发泡材料,研究硫化剂(硫黄)、发泡剂(油酸钾)和凝胶剂(氟硅化钠)用量及硫化工艺对天然胶乳发泡材料性能的影响。结果表明:硫黄和氟硅化钠用量对天然胶乳发泡材料的成型有较大影响,而油酸钾用量主要影响天然胶乳发泡材料泡孔结构,进而影响其性能,硫黄、油酸钾和氟硅化钠最佳用量分别为2.5,1.5和0.5份;硫化温度对天然胶乳发泡材料性能的影响大于硫化时间,天然胶乳发泡材料最佳硫化条件为120℃×30min,硫化模具开排气孔有利于提高天然胶乳发泡材料的性能。 相似文献
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Vorapong Pimolsiriphol Pongdhorn Saeoui 《Polymer-Plastics Technology and Engineering》2013,52(2):113-121
The present work aims to study the relationship among the thermal ageing stability, dynamic properties, cure systems, and antioxidants in natural rubber (NR) vulcanisates. Thermal degradation behavior of NR vulcanisates has been investigated and correlated to the changes in cross-link density, tensile and dynamic mechanical properties. The results obtained show that thermal ageing properties of NR vulcanisates depend strongly on cross-link density, which changes during thermal oxidative ageing or the so-called postcuring effect. In addition, the increases in ageing temperature and time lead dominantly to the postcuring and linkages scission phenomena in vulcanisates cured with CV and EV systems, respectively. With increasing ageing temperature, the tensile strength shows sharp drop at ageing temperature higher than 70°C and 100°C for the specimens cured with CV and EV systems, respectively. The sharp drop of tensile strength of vulcanisates cured with CV system is attributed to the too high cross-link density, which is caused by the postcuring effect. In the case of the vulcanisates cured with EV system, the linkage scission causes the sharp drop of tensile strength. The addition of amine-based antioxidant appears to improve ageing properties. However, the excessive antioxidant reduces tensile properties via a decrease in cross-link density. 相似文献
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过氧化物预硫化与硫黄硫化制备的医用天然胶乳制品热氧稳定性的差异 总被引:2,自引:0,他引:2
用TG-DTG方法研究动态空气状态下过氧化物预硫化天然胶乳(PPVL)制品试样和硫黄硫化天然胶乳制品试样的热氧降解。结果表明,PPVL试样和硫黄硫化体系试样的热氧降解反应为二步反应,前者的热氧降解起始温度To,DTG主降解峰温度L,终止温度T1均明显低于后者,反应活化能也明显低于后者;在较低温度下,两者均出现增重过程,前者比后者较明显,是后者的4.7倍;DTA曲线显示,前者出现的放热效应初始温度比后者提前。 相似文献
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Tibhawan Sajjayanukul Pongdhorn Saeoui 《Polymer-Plastics Technology and Engineering》2013,52(1):77-83
Two-layered vulcanisates were prepared from two rubbers with different dynamic properties, and the bulk dynamic properties of the layered rubber vulcanisates were assessed. The results reveal that the bulk dynamic properties are strongly dependent on a layer thickness ratio. For the specimens in which each layer has similar compressive modulus and dynamic properties, the relationship between the bulk dynamic properties and the layer thickness ratio obeys a rule of mixture. However, for the specimens in which each layer has a large difference in compressive modulus, some deviation from the rule of mixture towards the layer with relatively large deformability (i.e., the layer with relatively low compressive modulus) is observed. 相似文献