共查询到20条相似文献,搜索用时 46 毫秒
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罗成明 《现代塑料加工应用》1989,(3):41-46
一、概述聚酰胺(以下简称尼龙)可由二元胺和二元酸通过缩聚反应制得,也可由内酰胺通过自聚制得。尼龙6是己内酰胺的聚合物,是工程塑料中发展最早的品种,目前在产量上居于首位。聚酰胺具有很高的机械强度和韧性,耐磨、耐油、耐弱酸、弱碱和一般有机 相似文献
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通过共聚改性,可以开发出品种繁多,性能优异的聚酰胺新产品。综述了聚酰胺/聚酰胺共聚物、聚酯/聚酰胺共聚物两大类应用比较广泛的共聚酰胺研究进展。 相似文献
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综述了用聚烯烃或弹性体共混改性聚酰胺的最新研究进展。详细讨论了共混增容方式,包括5种反应性增容技术和2种类型的增容剂,对众多文献的研究目的和改性方向进行了总结。 相似文献
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综述了近年来聚酰胺工程塑料的各种摩擦学改性方法及改性聚酰胺材料的摩擦磨损形式与机制。重点从无机粒子填充改性,纤维增强改性,无机粒子/纤维混杂改性,与树脂共混,表面改性等几个方面讨论了聚酰胺工程塑料的摩擦学性能及机理的研究进展情况,并指出聚酰胺工程塑料的摩擦学改性研究方向。 相似文献
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聚酰胺共混改性研究进展 总被引:2,自引:0,他引:2
综述了近年来聚酰胺(PA)在增韧、增强以及增强增韧等方面的最新研究进展,重点介绍了增韧PA中反应性挤出的方法,指出在弹性体的分子链上接枝小分了,能与PA中的氨基或酰胺基反应生成原位共聚物,不相容的弹性体与PA间的相容性大为提高,达到增韧目的,聚苯醚和聚砜等性能优异的工程塑料与PA共混,加入适当的增容剂,在增韧的同时,共混物的强度下降较小,在合适的条件下,液晶聚合物(LCP)与PA共混,LCP产生原纤化作用,得到原位聚合物复合材料,具有很高的强度,加入增容剂,能提高PA和LCP的相容性,达到增韧的目的。PA与纳米级的无机填料共混,能得到刚性,强度和韧性综合性能较好的改性PA。 相似文献
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热致液晶高分子与尼龙共混改性进展 总被引:2,自引:1,他引:1
综述了近几年来热致液晶聚合物(TLCP)与尼龙(PA)共混改性的新进展,简要介绍了TLCP的加入对PA的熔融和结晶行为、粘度、形态结构以及力学性能等的影响,并阐述了增容技术在共混改性中的重要性以及影响TLCP成纤的主要因素。 相似文献
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Effect of Polyamide 66 on the Mechanical and Thermal Properties of Post-Industrial Waste Polyamide 6
Hesam Ghasemi Amin Mirzadeh Musa R. Kamal 《Polymer-Plastics Technology and Engineering》2013,52(17):1794-1803
Post-industrial waste (PIW) polyamide 6 is successfully used in lieu of commercial virgin polyamide 6, in several automotive applications. The presence of polyamide 66 in the final formulation may affect the mechanical and thermal properties of the PIW polyamide 6 materials. Using unreinforced polyamide 6 from PIW and commercial sources, it was found that the addition of polyamide 66 (below 10 wt.%) lowered the crystallization rate and crystallinity level of all polyamide 6 materials. The thermal and mechanical properties of glass fiber (GF) reinforced PIW polyamide 6 compounds with and without polyamide 66 were also studied. Differential scanning calorimetry (DSC) showed that reinforced materials without polyamide 66 had a higher level of crystallinity. Furthermore, dynamic mechanical analysis (DMA) showed that reinforced compounds without polyamide 66 also had a faster storage modulus buildup immediately after injection molding. Reinforced PIW polyamide 6 compounds without polyamide 66 also exhibited higher tensile and higher vibration weld strengths as well as a thicker heat affected zone (HAZ) than those with polyamide 66, leading to the conclusion that polyamide 66 had a detrimental effect on crystallinity level and consequently on the mechanical properties of GF-reinforced PIW polyamide 6 materials. 相似文献
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聚酰胺树脂泡沫的流变特性 总被引:2,自引:1,他引:1
对聚酰胺树脂泡沫进行了流变性研究,结果表明,不同气体对流变性无影响。泡沫为典型的非牛顿流体,随泡沫中气体的体积分量φ值的增大,泡沫的粘度及非牛顿性都增加,通过数据处理得到了泡沫稠度系数K和流动指数n与含气量φ的关系,K=116+0.3φ-0.035φ^2,n=0.868exp(-0.0016φ)相关系数分别为0.995和0.983。在研究中还观察到泡沫挤出的不稳定性即挤出速度振荡。 相似文献
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共聚尼龙增韧改性聚甲醛的研究 总被引:4,自引:0,他引:4
本文采用共聚尼龙,用机械共混的方法对聚甲醛进行增韧改性,并对共混物的形态,结构与力学性能进行测试与分析。研究发现,在POM/COPA共混体系中,存在着氢键的相互作用,且氢键的相对强度随COPA含量的增加而增加。COPA的加入,使得POM的熔融温度Tm和结晶温度Tc均增加,COPA含量在10%以下质量范围内,COPA对POM具有增韧改性作用。 相似文献
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It is well known that acidity, pH, of a solution accelerates the hydrolysis of soluble amides. Here we describe the unexpected result that weak small organic acids at low concentrations hydrolyze a polyamide at rates approximately twice that of a water HCl solution of the same pH. The effect of three small organic acids in dilute solutions, acetic, propanoic, and butanoic was studied. It is observed that the effect on the hydrolysis rate increases as the organic acid gets weaker. Butanoic, the weakest acid, has the strongest effect on increasing the hydrolysis rate. Measurements on the concentration of these acids in the polyamide reveal that there is a selective desire for these weak organic acids to diffuse into the polyamide. The concentration of these acids in the polyamide is found to be several multiples of the concentration in the water environment. And the acid concentration is highest for butanoic. The hydrolysis rate is shown to be governed by solubility, not pH of the water environment. The longer hydrocarbon tail on the carboxylic group increases its compatibility with the polyamide's monomer structure. Results are reported on the hydrolysis of polyamide-11 polymerized from aminoundecanoic acid, both neat and a commercial plasticized composition, placed in water at 100 °C and 120 °C under anaerobic conditions in high pressure glass tubes. 相似文献