共查询到20条相似文献,搜索用时 557 毫秒
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《现代塑料加工应用》2017,(6)
采用扫描电镜、动态力学分析仪和材料试验机研究了尼龙66(PA66)与聚酚氧(PHE)共混体系的共混形态和力学性能。研究表明:氢键作用使得二者熔融共混后形成部分相容的两相聚集态结构;以PA66为主体时,PHE以颗粒形态分散在PA66基体中,随PHE含量增加,分散相颗粒尺寸下降;此时尼龙相的玻璃化转变温度(Tg)增大,PHE相的Tg提高,共混体系拉伸强度增加,冲击强度下降。PA66/PHE质量比达到40/60后发生相反转,PA66分散相颗粒尺寸明显小于PHE为分散时相的颗粒尺寸。PHE相的Tg随PA66含量增加而增大,随PA66含量增加,共混体系拉伸强度和冲击强度均增大。 相似文献
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CPE/PA6共混物性能研究 总被引:2,自引:0,他引:2
考察CPE/PA6不同并用比、未经过动态硫化及经过动态硫化共混物各项物理机械性能的比较.得到CPE/PA6随并用比的变化其各项物理机械性能的变化规律。结果表明,共混物拉伸强度、100%定伸应力、硬度、拉伸永久变形随PA6用量的增加而增大,并且经动态硫化的共混物以上性能有进一步的提高;而拉断伸长率、耐介质体积变化率随PA6用量的增加不断减小:通过SEM可观察到动态硫化和非动态硫化共混物的微观结构变化。 相似文献
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动态硫化增韧聚丙烯/三元乙丙橡胶共混物的研究 总被引:1,自引:0,他引:1
研究了动态硫化和简单共混增韧聚丙烯(PP)/三元乙丙橡胶(EPDM)共混物的力学性能、形态结构、流动性能和脆韧转变。结果表明:动态硫化的增韧效率要比简单共混的增韧效率高;随着EPDM用量的增加,共混物的力学性能均随之发生变化,流动性明显降低;简单共混物的橡胶颗粒尺寸随EPDM含量的增加呈增大趋势,而动态硫化可以降低橡胶颗粒的尺寸;动态硫化物的临界基体层厚度大约为0.3μm,简单共混物的临界基体层厚度大约为0.2μm,并且动态硫化和简单共混物均在各自的临界基体层厚度处发生脆韧转变,验证了wu氏增韧理论。 相似文献
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采用熔融共混法制备了苯乙烯-马来酸酐共聚物(SMA)增容的聚酰胺6/丙烯腈-丁二烯-苯乙烯共聚物(PA6/ABS)共混物,用扫描电镜(SEM)对PA6/ABS共混物结构进行了表征.结果表明,随着SMA含量的增加,PA6/ABS共混体系的橡胶相粒径减小.橡胶颗粒的多分散系数保持不变,基体层厚度逐渐减小;PA6/ABS共混体系的脆韧转变温度随SMA含量的增加先减小后增加. 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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通过改变共混物中乙烯辛烯共聚物(POE)与马来酸酐接枝POE(POE-g-MAH)的比例,研究了MAH含量对聚酰胺6(PA6)/POE/POE-g-MAH/纳米碳酸钙(nano-CaCO3)复合材料的微观结构和力学性能的影响。结果表明,MAH含量较高时,POE-g-MAH与PA6基体的相容性好,复合材料的冲击强度最高;制备工艺对复合材料的形态及力学性能有很大影响,采用两步法制备的复合材料中nano-CaCO3分散效果更好,其增容作用使弹性体分散相直径增大约100 nm,冲击强度较一步法提高21 %。 相似文献
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研究了PA6/POE/POE-g-MAH分散相态与性能。结果表明:在不含POE-g-MAH的PA6/POE体系中,POE平均粒径为7.5μm,且大小分布很不均匀;掺入POE-g-MAH后,弹性体粒径迅速变小,加入10%的POE-g-MAH,其平均粒径为0.6μm。在POE/POE-g-MAH为30/70时,弹性体平均粒径为60nm;而只用POE-g-MAH时,其平均粒径只有50nm。分散相粒子越小,粒径分布越均匀。但粒径小于0.2μm时,对PA6增韧效果不佳。弹性体分散相粒径的大小与分布是影响共混物韧性的主要因素,但不影响共混物的屈服强度和模量。 相似文献
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尼龙-6/蒙脱土纳米复合材料用POE-g-MAH改性及性能研究 总被引:6,自引:1,他引:6
制备了尼龙-6(PA6)/马来酸酐接枝乙烯-1-辛烯共聚物(POE-g-MAH)和PA6-蒙脱土纳米复合物(NCH)/POE-g-MAH两种复合材料,其脆韧转变点都是在POE-g-MAH质量分数为8%~10%。在脆韧转变点前,PA6/POE-g-MAH和NCH/POE-g-MAH的缺口冲击强度几乎相同;在脆韧转变点后,NCH/POE-g-MAH的冲击强度远高于PA6/POE-g-MAH。复合材料的拉伸强度都随POE-g-MAH的增加而线性下降,在相同POE-g-MAH含量时,NCH/POE-g-MAH的拉伸强度比PA6/POE-g-MAH的低4MPa左右。 相似文献
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R. Nalini Uthaman A. Pandurangan S.S.M. Abdul Majeed 《Polymer Engineering and Science》2007,47(6):934-942
Dynamically vulcanized blends of polyoxymethylene (POM) and ethylene propylene diene terpolymer (EPDM) with and without compatibilizer were prepared by melt mixing in a twin screw extruder. Maleic anhydride (MAH) grafted EPDM (EPDM‐g‐MAH) has been used as a compatibilizer. Dicumyl peroxide was used for vulcanizing the elastomer phase in the blends. Mechanical, dynamical mechanical, thermal, and morphological properties of the blend systems have been investigated as a function of blend composition and compatibilizer content. The impact strength of both dynamically vulcanized blends and compatibilized/dynamically vulcanized blends increases with increase in elastomer content with decrease in tensile strength. Dynamic mechanical analysis shows decrease in tanδ values as the elastomer and compatibilizer content increased. Thermograms obtained from differential scanning calorimetric studies reveal that compatibilized blends have lower Tm values compared to dynamically vulcanized blends, which confirms strong interaction between the plastic and elastomer phase. Scanning electron microscopic observations on impact fractured surface indicate reduction in particle size of elastomer phase and its high level of dispersion in the POM matrix. In the case of compatibilized blends high degree of interaction between the component polymers has been observed. POLYM. ENG. SCI., 47:934–942, 2007. © 2007 Society of Plastics Engineers 相似文献
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马来酸酐接枝物对PE/PA6共混物相容性的影响 总被引:2,自引:0,他引:2
采用熔融共混法制备了PP/PA6/POE-g-MAH和PP/PA6/PP-g-MAH共混物。通过扫描电子显微镜(SEM)、差示扫描量热(DSC)仪分析和力学性能测试研究了增容剂POE-g-MAH和PP-g-MAH对PP/PA6共混物相容性、形态结构和宏观力学性能的影响。结果表明,在PP/PA6共混体系中分别加入POE-g-MAH和PP-g-MAH不仅能显著改善两相界面的相容性,减小分散相的粒径,而且能使共混物的力学性能显著提高。当增容剂的用量为5份时,PP/PA6共混物有较好的综合力学性能。POE-g-MAH和PP-g-MAH增容PP/PA6共混体系非等温结晶行为的研究表明,POE-g-MAH和PP-g-MAH均能促进PA6对PP基体的异相成核作用。 相似文献
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R. Nalini Uthaman A. Pandurangan S. S. M. Abdul Majeed 《Journal of Polymer Research》2007,14(6):441-447
Polyacetal (POM) and ethylene octene copolymer(EOC) elastomers form immiscible blends with extremely low compatibility. In
order to improve the dispersion, stability and properties of these blends, dynamic vulcanization was carried out in a twin
screw extruder using dicumyl peroxide. The tensile strength decreased with increase in % elongation at break for both blend
systems. There was a drastic decrease in impact strength for unvulcanized blends as the elastomer content increased and this
was attributed to the coalescence of the elastomer particles as their content increased. In the case of dynamically vulcanized
blends there was a significant increase in impact strength as the levels of elastomer increased. Dynamic mechanical analysis
has been carried out to investigate the effect of blend composition and dynamic vulcanization on dynamic mechanical parameters
such as storage modulus, loss modulus and loss factor. The results indicate gross incompatibility of POM and EOC blends. However,
dynamically vulcanized blends show better adhesion between component polymers. The morphological studies reveal that the particle
size and coalescence of elastomer was significantly reduced in comparison to unvulcanized bends. The phase adhesion was improved
by dynamic vulcanization. Hence, it was observed that dynamic vulcanization effectively improves the morphology of the blend
system and enhances the properties of polyacetal. 相似文献
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PC/PA6共混体系的耐溶剂性及其结晶行为的研究 总被引:1,自引:1,他引:0
聚碳酸酯(PC)易于应力开裂,耐化学腐蚀性差,尼龙(PA6)的加入可以改善PC的耐药性、耐应力开裂性。本实验以二甲苯为溶剂,对空白PC以及改性后的PC/PA6共混物进行浸泡,对其浸泡前后的物理机械性能以及样品宏观表面情况进行观察比较和分析,探讨了POE-g-MAH、PE-g-GMA两种不同相容剂及其用量和添加剂滑石粉对PC/PA6共混体系物理机械性能、耐溶剂性能、结晶性能等方面的影响。结果表明,PA6的加入可明显改善PC的耐二甲苯溶剂性能,滑石粉能进一步改善其耐溶剂性能,但添加量过多会致使冲击强度下降而限制材料的应用;POE-g- MAH、滑石粉较PE-g-GMA更有利于PA6的结晶,这可能与其异相成核或反应增容的作用有关;POE-g-MAH可明显地提高PC/PA6共混体系的相容性,且5%为较合理的添加量。 相似文献