共查询到19条相似文献,搜索用时 125 毫秒
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在反应挤出玻璃纤维增强尼龙6的小试研究基础上,本文进行了反应挤出制备尼龙6/玻璃纤维复合材料中试研究,中试结果表明,双螺杆反应挤出机各段温度在240℃左右,螺杆转速在100rpm,当玻璃纤维含量在30%时,反应挤出/玻璃纤维增强尼龙6材料的综合力学性能较好,中试操作难度总体小于小试。 相似文献
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以尼龙6、碘化钾和碘为原料,采用溶剂合成法制备了尼龙6高聚碘,考察了反应物配比、反应时间、反应温度对尼龙6高聚碘含碘量的影响,并且对其进行了拉曼光谱和热重分析,对不同含碘量的尼龙6高聚碘的熔点和水中溶碘量进行了测定。实验结果表明,使用冰乙酸溶剂法合成的尼龙6高聚碘反应均匀,含碘量可控,反应后产物容易分离;拉曼图谱显示,用溶剂法制备的尼龙6高聚碘是I5-与I3-的混合物,热重分析表明,在尼龙6高聚碘中存在着两类键合强度不同的碘,在两个温度区域内逐次分解。尼龙6高聚碘的水溶性很小,其溶碘量随着高聚碘含碘量的增加而降低,熔点随之也逐步降低。 相似文献
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《化纤文摘》2001,(1)
20011079尼龙6和尼龙“双元共混体系结晶与熔融的研究Shimomura T.…;Polymer Journal,1999,(9),P.795一801(英)采用差示扫描量热(DSC)法,研究尼龙66和尼龙6共混物的结晶及熔融特性。尼龙“和尼龙6是分别结晶的。尼龙“首先结晶,随后是尼龙6的明显结晶。由于尼龙6存在引起的稀释作用,使尼龙66的熔融温度明显下降。Nish卜Wang方程用于评估聚合体一聚合体之间相互作用的参数,该值有相对大的负值,显然是嫡大引起的。由于少量尼龙“的存在,尼龙6的熔点温度很窄。结晶温度曲线由尼龙“结晶开始,其结晶峰温位置随混合比增大逐步下降,最后处于… 相似文献
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用硅烷偶联剂处理过的载银纳米氧化锌抗菌剂与尼龙6切片共混制得抗菌尼龙6母料,通过熔融共混纺比投菌剂含量不同的抗菌尼龙6纤维,采用视频接触角测量仪,扫描电子显微镜、通用材料试验机、差示扫描量热仪等对抗菌剂表面改性效果及抗菌尼龙6纤维的结构形态,力学性能及结晶性能等进行了研究。结果表明:修饰后的抗菌剂表面呈疏水性,改善了与尼龙6基体的相容性,在尼龙6基体土均匀分散,与纯尼龙6纤维相比,抗菌尼龙6纤维的结晶温度和结晶速率有所提高,结晶度略有降低,抗菌尼龙6纤维的力学性能稍有下降,对大肠杆菌,金黄色葡萄球菌的杀菌率均达97%以上. 相似文献
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在一定假设基础上建立了尼龙6固相聚合过程模,并用实验数据验证了模型的正确性,结果表明随着固相聚合时间的延长,数均聚合度Un增加。 相似文献
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Jian‐Jun Xie 《应用聚合物科学杂志》2002,84(3):616-621
The kinetics of the thermally induced solid‐state polymerization (SSP) of nylon‐6 were examined in both a fixed‐bed reactor and a rotary reactor. Factors such as the regulator content, the reaction temperature and time, the particle size, the type and geometry of the nylon‐6 prepolymer, the nitrogen gas flow rate, the water content of the nitrogen gas flow, and the polymerization process were studied. The results showed that the regulator content, the reaction temperature and time, and the particle size were the primary factors, and that the others were negligible. Moreover, the SSP rate and number‐average molecular weight (Mn) increased with increasing reaction temperature and time and decreasing particle size. The SSP rate and Mn had maximum values with increasing regulator content in an experimental range of 0.03–0.07 wt %. © 2002 Wiley Periodicals, Inc. J Appl Polym Sci 84: 616–621, 2002; DOI 10.1002/app.10341 相似文献
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PA6固相聚合——相对分子质量研究 总被引:1,自引:1,他引:0
本文对PA6固相聚合(SSP)过程中影响聚合产物相对分子质量(RMW)的因素进行了研究.结果表明:RMW随RMW调节剂用量增加稍微增加后再迅速减小;聚合时间增加,则PA6的RMW开始迅速增加,随后逐渐减慢. 相似文献
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半芳香尼龙具有优异的力学强度、耐热性能和耐溶剂性能,在电子电器、汽车、轨道交通、特种装备中具有重要应用,受到了国内外学者和产业界的广泛关注。然而,传统聚合方法存在的制备周期长、分子量分布宽等技术难题长期得不到有效解决。本文利用微波能够使吸波材料快速、均匀升温的特点,首次在微波辅助条件下制备了耐高温半芳香尼龙PA12T,研究了在密闭条件下,以水作为吸波介质,水的用量、反应温度以及反应时间等条件对聚合产物特性黏数的影响,并对产物结构及热性能进行了表征。结果表明,微波辅助聚合与传统聚合方法相比,反应时间缩短三分之一以上,且产物分子量分布较窄,为解决传统半芳香尼龙聚合方法存在的问题进行了有价值的探索。 相似文献
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Nylon 6,6 resins, in the form of pellets, were solid state polymerized in the temperature range of 160–200°C in a fixed‐bed reactor under flowing nitrogen for times of 0–4 h. The kinetics of the solid state polymerization (SSP) of nylon 6,6 were examined by the evaluation of pertinent rate expressions and the selection of the most suitable one for describing the apparent overall process. The Flory‐theory‐based kinetic models were the most effective both for this study's data and for data previously published on SSP of different polyamides. Accordingly, SSP rate constants and activation energies were derived, and process parameters, such as the temperature and time, were investigated. © 2005 Wiley Periodicals, Inc. J Appl Polym Sci 97: 671–681, 2005 相似文献
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The postcondensation of nylon 6 in the solid state was studied. The reactions were carried out on fine powder in a fluidized bed reactor in a stream of dry nitrogen in the temperature range 110–205°C and during 1–24 h. The solid-state polymerization (SSP) did not follow melt kinetics, but was found to be limited by the diffusion of the autocatalyzing acid chain end group. Factors thought to influence SSP were studied, e.g., heat treatment, starting molecular weight, and remelting. Surprisningly, heat treatment had little effect, but the starting molecular weight had a strong effect on the reaction rate. The higher the starting molecular weight, the faster the reaction. This could be explained as a changing concentration distribution of the reactive groups in the solid state on SSP. The kinetics of the SSP had more than one region, and the rate of reaction for conversions of over 30% could be expressed as ? dc/dt = k(c/t), where k is a dimensionless constant independent of temperature with a value of 0.28. The integrated form has the form ? In(c/co) = k In(t/τ), where co is the acid end-group concentration at the start, t is the reaction time, and τ is the induction time. The value of τ is both dependent on the starting concentration co and the reaction temperature and has an activation energy of 105 kJ/mol. 相似文献