共查询到17条相似文献,搜索用时 165 毫秒
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利用转矩流变仪和应力流变仪对尼龙6/环氧树脂体系的化学流变行为进行了研究。结果表明:在热和剪切力的作用下,环氧树脂与PA6发生了化学微交联反应。使共混体系的转矩和熔体温度上升。研究了环氧树脂含量.转速和温度对共混体系的影响。反应共混物熔体量呈假塑性流体特征。随着环氧树脂含量的增加,共混物熔体的复数粘度和储能模量上升。 相似文献
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采用转矩流变仪和毛细管流变仪研究了丙烯腈-丁二烯-苯乙烯(ABS)/聚碳酸酯(PC)共混体系的流变行为,研究共混物组成对熔体流变行为的影响.结果表明:转矩流变仪中,平衡温度随着转速提高而增大,平衡转矩会在某一转速下达到峰值.两种测试方法得到的流变数据基本一致,共混物熔体呈现剪切变稀的假塑性流体特性.随着PC含量的增加,共混物的表现黏度逐渐增大,共混物熔体的非牛顿指数表现为负偏差,黏流活化能则表现出正负偏差,说明ABS与PC间具有一定的相容性. 相似文献
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《塑料助剂》2017,(6)
为了考察丁腈橡胶(NBR)与聚酰胺6(PA6)共混产物综合性能变化,本文采用不同种类NBR与PA6熔融共混,考察共混过程中转矩值变化,表征了共混物的力学性能、耐溶剂性能,并且共混产物进行了红外光谱分析。研究结果表明:随着共混物体系中橡胶相含量的增加,共混物体系的熔体粘度上升。相同腈基含量下的NBR/PA6共混物的平衡转矩值随着NBR含量的增加而增加;拉伸强度随着共混物中NBR橡胶含量的上升,呈下降趋势。在相同的NBR含量条件下,拉伸强度随着腈基含量的增加而增加;红外测试结果显示NBR与PA间在高温高剪切作用下存在微化学反应,即双键与胺基间的反应;共混物体系中随着NBR含量的上升,共混物体系的体积溶胀率与质量溶胀率均呈上升趋势。 相似文献
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将聚甲醛(POM)与丙烯酸酯类弹性体(ACR)在转矩流变仪中密炼共混15 min,研究了POM/ACR共混物的加工流变性能。结果表明,随ACR用量的增加,共混物熔体流动速率和最大转矩降低,平衡转矩提高,且塑化时间稍有延长。对于ACR质量分数为16%的共混物,密炼试验表明密炼温度和转速的升高对其平衡转矩、塑化时间及物料温度均有影响,但转速的影响更为突出。在相同的转速下,随着密炼温度的升高,平衡转矩变小、塑化时间缩短而物料温度上升的幅度变大;在同一密炼温度下,随着转速的提高,平衡转矩总体上增大,塑化时间明显变短,物料温度上升的幅度明显变大。转速70~100 r/min、密炼温度175℃是POM/ACR共混物较为合适的加工条件。 相似文献
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制备了AS/CPE共混物,用毛细管流变仪研究了其流变性能。实验结果表明:AS/CPE共混物熔体呈假塑性,其表观剪切粘度随剪切速率的增大或温度的升高而下降,随共混物中CPE含量的升高而上升。并讨论了CPE对共混物非牛顿指数的影响。 相似文献
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本文采用高压毛细管流变仪及HAKKE转矩流变仪对PVC/M-80共混体系的流变性能进行了研究。探讨了原料组分比,以及加工工艺参数对PVC/M-80共混体系流变性能的影响。结果表明,PVC/M-80共混体系熔体是典型的非牛顿假塑性流体;随着M-80组分比的增加,共混体系熔体的平衡扭矩和熔体温度均呈明显的降低趋势;共混体系熔体的平衡扭矩随加工温度的增加呈线性降低;在常用加工转速范围内,转速对共混体系流动性的影响不明显。 相似文献
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孙赫;郐羽;牟洋;张会轩 《中国塑料》2011,25(4):46-49
采用不同种类的丁腈橡胶(NBR)与聚酰胺6(PA6)熔融共混制备了聚酰胺6/丁腈橡胶混合物(PA6/NBR),考察了共混过程中转矩值的变化,并研究了不同腈基含量共混物的拉伸性能及耐溶剂性能。结果表明,随着橡胶相含量的增加,共混物的熔体黏度、体积溶胀率与质量溶胀率均显著提高,但拉伸强度下降。红外光谱分析表面NBR与PA6在高温高剪切作用下存在微化学反应,并且随腈基含量的增加,PA6/NBR共混物的平衡转矩值增大,拉伸强度明显提高,耐溶剂性下降。 相似文献
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以504及554/504分别作为固化剂,采用锥形双螺杆挤出机实现了PVC与环氧树脂的熔融共混,制备了PVC/环氧树脂E51共混物。固化剂用量为环氧树脂E51用量的80%时,研究了环氧树脂E51用量、固化剂组成及固化时间对PVC/环氧树脂E51共混物力学性能及维卡软化温度的影响。结果表明:以504及554/504为固化剂,少量环氧树脂E51(4份以内)加入PVC后,有助于提高共混物的拉伸强度、弯曲强度;当环氧树脂E51为2份、固化时间为8h时,共混物维卡软化温度达到最大值100.2℃,比纯PVC高出16.5℃。 相似文献
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Melt rheological properties of high density polyethylene and poly(ethylene terephthalate) (HDPE/PET) blends compatibilized by an ethylene–butyl acrylate–glycidyl methacrylate terpolymer (EBAGMA) were studied by means of a HAAKE torque rheometer and a capillary rheometer. The phase morphology of the blends was evaluated by a scanning electron microscope (SEM). The results showed that the melts of blends behave pseudoplasticity. The addition of EBAGMA strengthens the interfacial adhesion between HDPE and PET and improves the phase dispersion due to reactive compatibilization. It was observed that the balance torque, melt viscosity, and sensitivity of melt viscosity to shear rate of the melts increase with increasing content of EBAGMA, but the melt flow index and activation energy decrease. At the same time, the plasticizing time is shortened indicating that the processability of the compatibilized blends has been improved. © 2008 Wiley Periodicals, Inc. J Appl Polym Sci, 2008 相似文献
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本文将动态交联技术应用于PP/EVA共混体系中,制得动态交联PP/EVA共混物。采用Hakke转矩流变仪研究了动态交联对PP/EVA共混物扭矩的影响;研究了DCP和EVA含量对共混物力学性能的影响;考察了动态交联共混物的维卡软化点。结果表明:加入DCP后,PP/EVA共混物扭矩先升后降,DCP的添加量为EVA含量的1%为宜。随EVA用量的增加,动态交联EVA/PP共混物的冲击强度大幅提高,但拉伸强度有所降低。少量经动态交联的EVA颗粒可以促进共混物中PP的结晶, 提高共混物的维卡软化点。 相似文献
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The dynamic vulcanization process, usually used for the preparation of thermoplastic elastomers, was used to prepare polypropylene (PP)/epoxy blends. The blends had crosslinked epoxy resin particles finely dispersed in the PP matrix, and they were called dynamically cured PP/epoxy blends. Maleic anhydride grafted polypropylene (MAH‐g‐PP) was used as a compatibilizer. The effects of the reactive compatibilization and dynamic cure were studied with rheometry, capillary rheometry, and scanning electron microscopy (SEM). The crystallization behavior and mechanical properties of PP/epoxy, PP/MAH‐g‐PP/epoxy, and dynamically cured PP/epoxy blends were also investigated. The increase in the torque at equilibrium for the PP/MAH‐g‐PP/epoxy blends indicated the reaction between maleic anhydride groups of MAH‐g‐PP and the epoxy resin. The torque at equilibrium of the dynamically cured PP/epoxy blends increased with increasing epoxy resin content. Capillary rheological measurements also showed that the addition of MAH‐g‐PP or an increasing epoxy resin content increased the viscosity of PP/epoxy blends. SEM micrographs indicated that the PP/epoxy blends compatibilized with PP/MAH‐g‐PP had finer domains and more obscure boundaries than the PP/epoxy blends. A shift of the crystallization peak to a higher temperature for all the PP/epoxy blends indicated that uncured and cured epoxy resin particles in the blends could act as effective nucleating agents. The spherulites of pure PP were larger than those of PP in the PP/epoxy, PP/MAH‐g‐PP/epoxy, and dynamically cured PP/epoxy blends, as measured by polarized optical microscopy. The dynamically cured PP/epoxy blends had better mechanical properties than the PP/epoxy and PP/MAH‐g‐PP/epoxy blends. With increasing epoxy resin content, the flexural modulus of all the blends increased significantly, and the impact strength and tensile strength increased slightly, whereas the elongation at break decreased dramatically. © 2004 Wiley Periodicals, Inc. J Appl Polym Sci 92: 1437–1448, 2004 相似文献
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利用熔体流动速率测试仪和转矩流变仪对不同比例的高熔体强度聚丙烯(HMSPP)/低密度聚乙烯(PELD)共混体系的流变行为进行研究,并对共混体系的流变数据进行分析.随后采用超临界CO2作为发泡剂进行了HMSPP/PE-LD共混体系的挤出发泡研究,并通过真密度计和扫描电子显微镜表征了发泡材料的表观密度和泡体结构参数.结果表... 相似文献
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将三官能团环氧树脂作为交联剂用于聚乳酸(PLA)的挤出化学发泡成型,研究了三官能环氧树脂含量对PLA熔融结晶性能、交联度、熔体强度的影响以及对PLA化学挤出发泡试样的泡孔形态的影响。结果表明,随着三官能环氧树脂含量的增加,冷结晶温度提高,且添加三官能环氧树脂后熔融峰由单峰变成双峰,结晶峰面积、熔融峰面积以及结晶度都是先增加后减少的趋势;PLA体系的交联度和熔体强度的显著提高随着三官能团环氧树脂的增加;PLA体系泡孔破裂减少,开孔率减少,泡孔尺寸先减小后增大;较佳挤出机头温度为170~175 ℃。 相似文献