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Harintharavimal Balakrishnan Muhamad Rasyidi Husin Mohammed Rafiq Abdul Kadir 《Polymer-Plastics Technology and Engineering》2013,52(8):774-782
The study investigated the use of maleated high density polyethylene (mHDPE) as a compatibilizer in high density polyethylene/hydroxyapatite (HDPE/HA) composites for biomedical applications. The addition of HA increased the strength and stiffness of HDPE/HA composites while the use of mHDPE in HDPE/HA composites improved its elongation at break values. The SEM images revealed that the addition of mHDPE has induced the formation of HDPE fibrils in mHDPE/HA composites. The size of apatite layer increased with simulated body fluid (SBF) immersion time and the formation of apatite layers on the surface of composites indicates excellent biocompatibility properties. 相似文献
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Li Xie Xia-Yan Lv Zhong-Jie Han Ji-Hao Ci Chang-Qing Fang 《Polymer-Plastics Technology and Engineering》2013,52(12):1251-1257
Montmorillonite (MMT) was first modified with dodecyl dimethylbenzyl ammonium (DDA) salt and octadecyl trimethyl ammonium (OTA) salt. Then low density polyethylene (LDPE)/organic montmorillonite (OMMT) nanocomposites were prepared by twin-screw extruder and hot-press. Transmission electron microscopy (TEM) results showed that OMMT layers were homogeneously intercalated into the LDPE matrix. In terms of MMT, the modification effect of OTA is superior to that of DDA. CO2 and O2 barrier properties of nanocomposites were increased by 7 times and 4 times with 0.5 wt.% OTA-MMT loading, respectively. At 2 wt% OTA-MMT loading, water vapor permeability of LDPE has also decreased about 2.5 times. Compared with pure PE film, 49.5% and 178% improvement of tensile strength of nanocomposites films were obtained by addition of only 4 wt.% DDA-MMT and OTA-MMT, respectively. In addition, with only 0.5 wt.% OMMT loading, the onset degradation temperature of nanocomposites increases by 23°C and 26°C for LDPE/DDA-MMT and LDPE/OTA-MMT, respectively. 相似文献
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A. P. Gupta Manjari Sharma Vijai Kumar 《Polymer-Plastics Technology and Engineering》2013,52(9):953-959
Polysaccharide-filled plastics have attracted immense interest from research scientists as a means to develop a biodisintegrable polymer. The objective of the present study is to develop a biodisintegrable polymer composite using potato starch, which may be a step toward an alternative user friendly polymer composite. Keeping in mind the compatibility issue between potato starch and polyethylene, we used a base material with a polar group in its low density polyethylene (LDPE) backbone. Polymer composite sheets with a combination of potato starch, LDPE, and LDPE grafted maleic anhydride (LDPE-g-mA) were prepared. The LDPE and LDPE-g-mA were used in equal amounts and as a base material. The starch contents varied between 0 and 30%. The composites so prepared were tested for their thermal and mechanical properties. The results show that the thermal stability and melting temperature of these composites did not change significantly with various combinations of potato starch. The mechanical testing results show that tensile strength of material could be maintained at up to 15% mixing of potato starch in composites, and at up to 5% mixing of potato starch the percentage elongation was intact. 相似文献
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采用马来酸酐接枝乙烯醋酸乙烯酯(EVA-g-MAH)和马来酸酐接枝低密度聚乙烯(PE-LD-g-MAH)为相容剂,制备了高密度聚乙烯傣脱土(PE-HD/MMT)纳米复合材料。用X射线衍射和扫描电镜对有机蒙脱土和PE-HD/MMT复合材料的结构进行了表征,研究了蒙脱土和相容剂含量对制备的纳米复合材料力学性能及热性能的影响。结果表明,相容剂的加入有利于插层。MMT在复合材料中呈纳米级分散。其层间距可由2.10nm增大至3.85nm。MMT含量为3%(质量分数,下同)、EVA-g-MAH含量为15%时,复合材料的综合力学性能最好,冲击强度和拉伸强度分别较PE-HD提高43.7%和5.8%。 相似文献
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采用双螺杆挤出机制备了不同含量高密度聚乙烯(PE–HD)/硅酸钙(Ca Si O3)复合材料,并采用马来酸酐接枝聚乙烯作为相容剂对该复合材料进行改性,研究了相容剂含量对复合材料力学性能的影响。结果表明,随着相容剂含量的增加,复合材料的力学性能先增加后保持不变,综合考虑,相容剂含量为10份时,对复合材料的力学性能改性效果最佳。然后以此相容剂含量为基准,研究了Ca Si O3含量对复合材料力学性能和阻燃性能的影响。结果显示,随着Ca Si O3含量的增加,复合材料的冲击强度增加,拉伸强度先下降后上升,氧指数略有增加,垂直燃烧性能变化不大。这表明Ca Si O3的填充对PE–HD具有较好的增韧效果,对阻燃性能也有一定提高。 相似文献
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采用差示扫描量热仪研究了不同石墨烯(GP)含量的低密度聚乙烯(PE–LD)纳米复合材料在不同降温速率下的非等温结晶行为。结果表明,不同含量GP填料的加入均导致PE–LD结晶温度提高,表明GP填料对PE–LD基体起到异相成核作用;莫志深法能很好地描述纳米复合材料的动态结晶行为。动力学数据显示,当GP质量分数为0.5%和2%时,PE–LD复合材料的整体结晶速率、活化能、成核常数和生长晶面的表面自由能均比纯PE–LD低,而含量为5%时其值均比纯PE–LD高,因此适量的GP有利于PE–LD的结晶。由成核常数、表面自由能值可看出低含量GP促进PE–LD晶粒的二次成核、生长,而高含量GP则抑制晶粒二次成核、生长。 相似文献
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系统地介绍了高密度聚乙烯(HDPE)的增韧改性技术和工艺,并分析了HDPE增韧技术与应用中的问题。 相似文献
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Navid Kaptan Seyed Hassan Jafari Saeedeh Mazinani Hakimeh Fazilat Ulf W. Gedde 《Polymer-Plastics Technology and Engineering》2013,52(9):890-902
Morphology, thermal degradation and kinetics of metallocene-linear-low-density polyethylene (m-LLDPE)/m-LLDPE-graft-maleic anhydride (m-LLDPE-g-MA)/nanoclay nanocomposites were compared with m-LLDPE/nanoclay, m-LLDPE-g-MA/nanoclay and m-LLDPE/m-LLDPE-g-MA systems. X-ray diffraction measurements revealed intercalated and “highly intercalated” morphologies for the nanocomposites. Thermogravimetric analysis demonstrated that although thermal degradation of m-LLDPE systems were delayed upon the inclusion of nanoclay in air, an inverse effect was perceived for the nanoclay under inert atmosphere. This conclusion was supported by kinetic analysis in terms of reaction order and activation energy. The results obtained from kinetics models also put forward the contribution of m-LLDPE-g-MA, as a compatibilizer, to the thermal stability enhancement through inter-molecular cross-linking augmentation. 相似文献
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本实验采用吹塑成型工艺,以不同牌号的聚乙烯(PE)树脂为原料生产2 mm厚度双光面高密度聚乙烯(HDPE)土工膜,研究PE原料对HDPE土工膜性能的影响。结果表明:中密度聚乙烯(MDPE)土工膜综合性能优异,主要是由其特有的分子结构(如分子量分布双峰性、α烯烃长支链)所决定的;不同PE原料氧化诱导时间不同,可通过调节含抗氧剂色母料(或抗氧剂)的含量,使HDPE土工膜氧化诱导时间达到要求;HDPE土工膜在焊接时应根据PE材质的不同而选择不同的焊接条件。 相似文献
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Jungang Gao Dongshuan Hua Yonggang Du Xing Li 《Polymer-Plastics Technology and Engineering》2013,52(14):1429-1437
Polyhedral oligomeric silsesquioxane (POSS) is usually prepared from the hydrolytic condensation of organotrialkoxysilanes. The rheology, non-isothermal crystallization kinetics and mechanical properties of high density polyethylene (HDPE)/vinyl-containing POSS (V-POSS) nanocomposites were investigated. The results show that the molten HDPE/V-POSS belong to pseudoplastic fluid. The V-POSS can accelerate the nucleation of HDPE at starting stage of crystallization. However, it will decrease the crystallization ability of HDPE in the subsequent crystallization process. The modified Avrami analysis by Jeziorny can well explain the crystallization behaviour of HDPE/V-POSS. The yield strength and tensile modulus of nanocomposites both increase when V-POSS content is 6%. 相似文献
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PE-LD/凹凸棒土纳米粒子复合材料的制备与性能研究 总被引:2,自引:1,他引:2
采用超声波分散方法将凹凸棒土(AT)在甲苯中进行分散,然后采用硅烷偶联剂KH570对凹凸棒土纳米棒晶进行表面处理,将经上述处理的凹凸棒土与低密度聚乙烯(PE-LD)复合制备纳米粒子复合材料,研究了纳米粒子复合材料的晶体结构与性能。结果表明,凹凸棒土在一定程度上可以提高PE-LD的综合性能。 相似文献
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以片状云母粉为阻隔改性剂,与高密度聚乙烯(PE–HD)熔融共混,以改善其对汽油的阻隔性,考察云母粉形貌、含量等因素对PE–HD/云母粉复合材料阻隔性、熔体流动性以及力学性能的影响。结果表明,云母粉可显著提高复合材料对汽油的阻隔性,但熔体流动速率(MFR)与断裂伸长率降幅明显,高径厚比的云母粉对复合材料的汽油阻隔性提升更为显著,但径厚比过大不利于阻隔性的进一步提升,并会导致材料MFR和断裂伸长率进一步下降;当云母粉含量开始增加时,复合材料的汽油阻隔性明显提升,拉伸强度与缺口冲击强度上升,而MFR和断裂伸长率下降,当裂纹发展方向垂直于云母片面积方向时,缺口冲击强度提高更为显著;随着云母粉含量继续增加,复合材料的汽油阻隔性趋于稳定,拉伸强度与缺口冲击强度却明显下降。当径厚比为180的云母粉质量分数为30%时,复合材料具有最佳的综合性能,其汽油浸泡后的拉伸强度保持率显著高于纯PE–HD。 相似文献
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用溶液插层制备的马来酸酐接枝聚乙烯/膨胀石墨(EG)(60/40)作为EG母料,以不同用量、方法或条件与PE-HD熔融共混后模压为板材,研究了复合材料的加工-结构-性能关系。结果表明:熔体捏合或挤出时物料受剪切程度越小,材料中EG粒子的尺寸、形状比越大,粒子内部EG-聚合物复合结构的规整性也越好,材料的导电逾渗阈值就越低,定EG含量下的电导率σ就越高而拉伸强度(σt)越低。 相似文献