共查询到20条相似文献,搜索用时 78 毫秒
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介绍了聚丙烯流延薄膜在国内外的生产现状和发展趋势。着重评述了挤出流延设备的结构,聚丙烯专用料的性能,流延聚丙烯薄膜的品种,以及流延薄膜的应用。 相似文献
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将聚氟乙烯(PVF)经增塑剂及N,N-二甲基甲酰胺(DMF)溶剂改性后,用溶液流延法制备了PVF薄膜,并研究了制备工艺对膜的结构、性能及表面形态的影响。结果表明,PVF经DMF溶剂溶解后,其结晶被破坏,同时薄膜的拉伸强度下降,断裂伸长率增加;选用浓度为3 %(质量分数,下同)的PVF成膜液,以邻苯二甲酸二辛酯(DOP)为增塑剂,在100 r/min的搅拌速度和85 ℃的温度下充分溶解,经消泡剂处理后立即流延成膜可得到力学性能和表面形态较好的PVF薄膜。 相似文献
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采用非水基流延法制备了8mol%氧化钇稳定氧化锆薄膜,研究了球磨时间、固含量、有机添加剂含量及除泡工艺对8YSZ浆料流变性能的影响,通过SEM表征烧结体表面形貌,用电化学阻抗仪对烧结体进行电导率测试。结果表明:分散剂用量1.25wt%,球磨时间15h,浆料的粘度最小,分散效果最好;增塑剂与粘结剂比例为0.7,粘结剂加入量6.5~8.5wt%,二次球磨后,真空除泡可获得适合流延的浆料;生坯1450℃烧结4h,烧结体晶界清晰、致密度较好;烧结体在300~800℃随温度的升高电导率逐渐增大,在800℃时离子电导率达0.046S/cm。 相似文献
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UHMWPE凝胶成膜方法探讨 总被引:1,自引:0,他引:1
探讨了超高摩尔质量聚乙烯制备薄膜的方法。用溶液法制备超高摩尔质量聚乙烯薄膜。研究了超高摩尔质量聚乙烯和聚乙烯共混对溶液凝胶成膜的条件以及薄膜力学性能的影响。 相似文献
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在聚氟乙烯(PVF)凝胶法成膜的基础上,通过X-射线衍射及万能材料试验仪等手段,研究了在PVF薄膜双向拉伸过程中拉伸比及温度等因素与双向拉伸聚氟乙烯薄膜(BOPVF)性能的关系,讨论了结晶因素对薄膜性能的影响。实验表明,在横向拉伸比固定情况下,随着拉伸比增加,拉伸强度、拉伸模量明显增加,而断裂伸长率则逐渐降低,反之亦然。透光性能也随着拉伸比增加也有所改善。纵向拉伸温度选择:预热辊温度约140~145℃;拉伸辊温度约130~135℃。横向拉伸温度选择:横向拉伸温度比纵向温度约高20~30℃,具体温度取决于薄膜厚度和拉伸速度。在横向拉伸比固定的前提下,PVF薄膜随纵向拉伸比增加,结晶度增加,薄膜拉伸强度也随之提高,而断裂伸长率逐渐降低。 相似文献
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SA/PVA可降解复合塑料膜的制备与性能研究 总被引:1,自引:0,他引:1
对木薯原淀粉进行乙酰化改性,合成低酯化度的木薯淀粉醋酸酯(SA);经增塑、交联后与聚乙烯醇(PVA)合成可降解的SA/PVA复合塑料膜,重点研究了PVA、甘油、乙二醛的用量及SA的酯化度对复合膜力学性能的影响,并对复合膜性能进行了表征。结果表明:在PVA质量分数为40%,甘油质量分数为14%,乙二醛质量分数为4%时,可以得到力学性能较好的复合塑料膜;与原淀粉/PVA复合膜相比,复合膜致密性提高,玻璃化转变温度降低,结晶度下降,表现出更好的力学性能。 相似文献
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通过新型的旋转芯棒薄膜吹塑设备制备了低密度聚乙烯(LDPE)/高密度聚乙烯(HDPE)复合薄膜,并研究了该设备模具流道环流协同作用对吹塑聚乙烯薄膜结构和性能的影响。结果表明,制备的聚乙烯薄膜呈现一种互锁片晶结构;芯棒转速的提高对聚乙烯薄膜样品的结晶度、片晶厚度也有一定增益作用,使得结晶更完善;聚乙烯薄膜的拉伸性能和撕裂性能随芯棒转速提高都有所提升,尤其是横向力学性能,横向拉伸性能最大提升幅度为25.75%,横向撕裂性能最大提升幅度为27.64%;同时,该技术实现了在不影响聚乙烯薄膜的纵向热收缩率的情况下,大幅提高其横向热收缩率,提升幅度可达128.41%。 相似文献
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A. Akbari‐Fakhrabadi R. V. Mangalaraja M. Jamshidijam S. Ananthakumar S. H. Chan 《Fuel Cells》2013,13(5):682-688
Mechanical properties of gadolinium‐doped ceria (Ce0.9Gd0.1O1.95, 10GDC) green tape prepared by aqueous‐based tape casting process were characterized by tensile test and shear punch test (SPT). SPT was found to be a useful method for characterizing mechanical properties of green tapes. Microstructures and mechanical properties such as flexural modulus, bending strength, and microhardness of tapes sintered at 1,300–1,500 °C have been evaluated. Indentation fracture toughness was also determined by the method of Palmqvist cracks at different applied loads for tapes sintered at 1,500 °C. Grain size measurements showed that excessive grain growth occurred during sintering despite using 10GDC nanopowders as the starting material. However, mechanical properties of sintered tapes improved by increasing sintering temperature and the results are comparable with those reported for 10GDC in literature. 相似文献
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A gas‐tight yttria‐stabilized zirconia (YSZ) electrolyte film was fabricated on porous NiO–YSZ anode substrates by a binder‐assisted slurry casting technique. The scanning electron microscope (SEM) results showed that the YSZ film was relatively dense with a thickness of 10 μm. La0.8Sr0.2MnO3 (LSM)–YSZ was applied to cathode using a screen‐print technique and the single fuel cells were tested in a temperature range from 600 to 800 °C. An open circuit voltage (OCV) of over 1.0 V was observed. The maximum power densities at 600, 700, and 800 °C were 0.13, 0.44, and 1.1 W cm–2, respectively. 相似文献
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选取3种不同的离子交换容量(IEC)的氟型全氟磺酸离子交换树脂(PFSR),采用熔融流延挤出方法来制备不同IEC值的离子交换薄膜.分别利用热失重分析(TGA)、熔体流动速率仪、毛细管流变仪、哈克扭矩流变仪、X射线衍射(XRD)对3种树脂的熔融加工稳定性、熔体流变性能及挤出树脂的结晶性能进行了全面的分析研究.结果表明,在380℃以下,3种树脂的静态稳定性都很好,但当温度升高,静态稳定性随树脂IEC的升高而下降.低剪切速率下,PFSR熔融温度随IEC的升高而明显降低.PFSR树脂为剪切变稀型非牛顿流体,其表观黏度对加工剪切速率敏感;PFSR树脂在高剪切速率下的动态热稳定性能明显下降,当达到240℃以上,树脂中会出现微小气泡,其加工和动态热稳定温度随IEC值的降低而增加.另外,PFSR树脂为一种低结晶型聚合物,其结晶能力主要受其IEC值影响,并随其增加而下降. 相似文献
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Guoquan Zhu Hongsheng Tan Qiaochun Gao Yuying Liu 《Polymer-Plastics Technology and Engineering》2013,52(15):1562-1566
Poly(L-lactic acid) (PLLA)/polyurethane (PU)-blend films were prepared by casting the polymer blend solution in chloroform. Surface morphologies of the PLLA/PU-blend films were investigated by scanning electron microscopy (SEM). Thermal, mechanical, and chemical properties of PLLA/PU-blend films were studied by differential scanning calorimetry (DSC), tensile tests, and contact angle testing. It was indicated that the addition of PU could exert marked effects on the properties of PLLA films. 相似文献