聚丙烯固相接枝物增容PA6/PS共混体系

采用FTIR和WAXD研究了聚丙烯固相接枝苯乙烯（St)和马来酸酐（MAH）的结构，并研究了它对聚酰胺6／聚苯乙烯（PA6／PS）共混体系力学性能的影响及其非等温结晶动力学，研究结果表明，PP上可固相接枝St,MAH;gPP(PP接枝St和MAH双组分接枝物）增容PA6／PS的非等温结晶动力学与MandelKern理论基本吻合。     

PS接枝PA6共聚合研究

采用熔融接枝法制备PA6-g-PS共聚物,研究了原料配比(PA6：PS)、引发剂用量(DCP％)和反应温度(T)对接枝效率的影响。结果表明：产物PA6-g-Ps的接枝效率随DCP%的增加及T的升高,均呈现先上升后下降的趋势;而随PA6：PS的增加则一直呈下降趋势。同时,对PA6-g-Ps接枝共聚产物进行FITR、X-射线衍射分析。     

PS-g-PA6制备及在PS/PA6体系的相容作用

利用苯乙烯（St）和3-异丙烯基-α，α-二甲基苄基异氰酸酯（TMI）的共聚物为起始剂，在催化剂己内酰胺钠（NaCL）存在下，TMI中异氰酸官能团引发己内酰胺（CL）聚合，合成了接枝共聚物PS-g-PA6。进-步研究了相容剂PS-g-PA6存在下聚苯乙烯（PS）和尼龙6（PA6）共混体系的形态结构。结果表明：不论母体PS和分散相PA6的比例如何，只需少量的PS-g-PA6就可大幅减小分散相PA6的粒径。对于PS／PA6（90／10）共混体系，仅需加入1．50％（质量分数）的PS-g-PA6，分散相的粒径从没有加PS-g-PA6的2．5μm减小至0．3μm。     

HDPE-g-MAH对PA6/UHMWPE共混合金力学性能及结晶行为的影响

采用HDPE-g-MAH作为相容剂来增容PA6/UHMWPE共混合金。结果表明:在熔融共混过程中HDPE-g-MAH和PA6发生化学反应,生成的接枝聚合物对PA6/UHMWPE产生增容作用。加入HDPE-g-MAH共混体系的界面形态和力学性能均有较大的改善,吸水率也有所下降。通过Mo-lau实验I、R、SEM观察来研究其在熔融共混过程对PA6/UHMWPE的反应增容作用。采用DSC实验对PA6/UHMWPE共混合金进行了结晶性能测试,随着HDPE-g-MAH用量的增加,UHMWPE结晶度增加,而PA6的结晶度降低。     

纳米碳酸钙对PA6/PP共混合金的性能影响

研究了纳米CaCO3的表面处理及用量对尼龙(PA)6/聚丙烯(PP)合金材料性能的影响.结果表明,采用钛酸酯偶联剂对纳米CaCO3进行表面处理,能有效提高合金材料的力学性能.合金材料中加入10份纳米CaCO3,其力学性能最优,热变形温度达到最大值90.8℃.合金材料的冲击断面SEM照片显示,加入适量的纳米CaCO3能提...     

吸湿性PA6/PEG共混物的研究

通过熔融共混的方法，在PA6中混入质量分数为3％－10％的聚乙二醇（PEG），使PA6共混物的吸湿性明显提高。随PEG加入量的增大，PA6共混物的拉伸强度有所下降而缺口冲击强度上升，说明PEG可以在PA6中发挥增塑作用。     

PA6/纳米CaCO3复合材料的制备和性能

在适宜的条件下将纳米CaCO3用硬脂酸通过超高速混合进行表面处理。采用熔融共混工艺制备了PA6/纳米CaCO3复合材料。结果表明，纳米CaCO3含量为1份左右时复合材料的拉伸强度达到最大值，比PA6高约11%，纳米CaCO3含量10份左右时复合材料缺口冲击强度达到最大值，比PA6高约40%；复合材料的拉伸弹性模量随纳米CaCO3含量增加而提高，在纳米CaCO3含量为10份时较PA6提高约20%，20份时提高约30%。     

共混工艺对PP/PA6/纳米SiO2复合材料力学性能的影响

以聚丙烯（PP）作为基体,经表面处理过的纳米二氧化硅（nano-SiO2）和刚性聚合物尼龙6（PA6）作为改性剂,添加5％的接枝POE作增容剂,采用不同的共混工艺制备PP／PA6／纳米SiO2复合材料。研究了熔融共混挤出次数和共混方法对PP／PA6／纳米SiO2复合材料力学性能的影响,借助扫描电子显微镜从断面形貌上分析了影响复合材料力学性能的因素。结果表明：采用二次挤出熔融共混比一次挤出熔融共混制得的复合材料力学性能要好;采用PP与纳米SiO2先熔融共混挤出制得粒料,再用PA6、接枝POE与粒料熔融共混挤出的共混方法制得的复合材料综合力学性能最优。     

PA6/MPEG共混物的制备及性能研究

利用聚乙二醇(PEG)的端羟基与马来酸酐(MAH)进行化学反应，制备了聚乙二醇双马来酸酯(MPEG)。通过熔融共混的方法在PA6中混入质量分数为2％-10％的MPEG，制得PA6／MPEG共混物。MPEG的加入可起到增塑作用。随其加入量的增加，共混物的拉伸强度和洛氏硬度降低，缺口冲击强度增大，同时共混物的亲水性明显提高。     

ABS/PA6合金研究进展

介绍了PA6/ABS合金在国内外发展状况、当前ABS/PA6合金技术发展趋势、相容剂种类及其各组成对PA6/ABS合金性能的影响。     

制备方式对PA6/PA6-66-1010共混物结构与性能的影响

采用原位共混和熔融共混分别制备了尼龙(PA)6/PA6-66-1010共混物。利用傅里叶变换红外光谱仪、差示扫描量热仪、动态热机械分析、力学性能测试和扫描电子显微镜对共混物的内部氢键作用、结晶熔融行为、玻璃化转变温度、力学性能及拉伸断裂形貌进行了表征。结果表明,原位共混物的分子链段的运动性和柔性好于熔融共混物,结晶温度、熔融温度、结晶度均低于熔融共混物,强度和韧性均优于熔融共混物。     

Effect of in situ synthesized macroactivator on morphology of PA6/PS blends via successive polymerization

In situ polymerization and in situ compatibilization was adopted for preparation of ternary PA6/PS‐g‐PA6/PS blends by means of successive polymerization of styrene, with TMI and ε‐caprolactam, via free radical copolymerization and anionic ring‐opening polymerization, respectively. Copolymer poly(St‐g‐TMI), the chain of which bears isocyanate (? NCO), acts as a macroactivator to initiate PA6 chain growth from the PS chain and graft copolymer of PS‐g‐PA6 and pure PA6 form, simultaneously. The effect of the macroactivator poly(St‐g‐TMI) on the phase morphology was investigated in detail, using scanning electron microscopy. In case of blends with higher content of PS‐g‐PA6 copolymer, copolymer nanoparticles coexisting with the PS formed the matrix, in which PA6 microspheres were dispersed evenly as minor phase. The content of the compositions (homopolystyrene, homopolyamide 6, and PS‐g‐PA6) of the blends were determined by selective solvent extraction technique. The mechanical properties of PA6/PS‐g‐PA6/PS blends were better than that of PA6/PS blends. Especially for the blends T10 with lower PS‐g‐PA6 copolymer content, both the flexural strength and flexural modulus showed significantly improving because of the improved interfacial adhesion between PS and PA6. © 2007 Wiley Periodicals, Inc. J Appl Polym Sci 2007     

PP-g-MAH和PP-g-GMA增容PP/PA6共混体系的研究

将自制的PP—g—MAH（聚丙烯接枝马来酸酐）及PP—g—GMA（聚丙烯接枝甲基丙烯酸缩水甘油酯）作为PP／PA6共混体系的相容剂，研究了加入聚丙烯接枝物后PP，PA6塑料合金的各种力学性能及形态结构。结果表明：在PP／PA6共混物中加入PP—g—MAH后，共混物的力学性能得到明显的提高．添加PP—g—MAH对不同比例PP／PA6共混物力学性能的影响不同；用PP—g—MAH和PP—g—GMA两种接枝物共同作为相容剂加入到PP／PA6共混物中比单独使用一种的效果要好。共混物的SEM照片表明。PP—g—MAH是PP／PA6共混物的有效增容剂。     

PA6／PET切片熔融共混纺丝工艺介绍

在锦纶6（PA6）切片中加入一定数量聚酯（PET）切片进行熔融共混纺丝,主要过程包括配料、熔融、纺丝、侧吹风冷却、上油、拉伸、卷绕成型,获得锦涤FDY工业丝。经测试锦涤工业丝的断裂强度为8．0—8．5cN／dtex,断裂伸长为15％～17％。     

A Novel Approach to the Preparation of Nano-Blends of PPO/PS/PA6

Summary A novel approach of in situ polymerization and in situ compatibilization was adopted to prepare the nano-blend of poly (2,6-dimethyl-1,4-phenylene oxide) (PPO), polystyrene (PS) and polyamide 6 (PA6). Anionic ring-opening polymerization of -caprolactam was carried out in the presence of PPO and PS. And PS, the chain of which bore methylmethacrylate (MMA) groups, acted as macroactivator to initiate PA6 chain growth from the PS chain and formed a graft copolymer of PS and PA6 and pure PA6 simultaneously. Thus the nano-structured PA6 dispersed phase in the PPO matrix could be achieved.     

PA6/ABS合金的研制

以POE-g-MAH为增容剂,应用双螺杆挤出机制备通过熔融共混法制备了PA6/ABS合金,研究了ABS树脂的用量对合金的力学性能的影响。结果表明:在POE-g-MAH存在的条件下,随着ABS用量增大,共混物的拉伸强度逐渐增大,简支梁缺口冲击强度则逐渐减小,而无缺口冲击强度先减小后增大。在混和体系中,POE-g-MAH具有增容和增韧的双重作用。     

Confined crystallization phenomena in immiscible polymer blends with dispersed micro - and nanometer sized PA6 droplets, part 1: uncompatibilized PS/PA6, (PPE/PS)/PA6 and PPE/PA6 blends

In this paper the crystallization behavior of PA6, dispersed as droplets in various immiscible amorphous polymer matrices, is reported. PA6 was melt-mixed at various compositions with PS, (PPE/PS 50/50 wt/wt) and PPE using twin-screw extrusion. The phase morphologies of the obtained blends were analysed using SEM, etching experiments and image analysis. The crystallization behavior of PA6 was investigated by dynamic and isothermal DSC experiments. In case PA6 is dispersed as droplets, fractionated crystallization behavior occurs, characterized by several crystallization events at different, lowered crystallization temperatures. It is found to depend on the blend morphology (size of the droplets) and the thermal history of the samples (heterogeneous nucleation density). The PA6 droplet size distribution is shown to strongly influence the crystallization behavior of the droplets. Vitrification of the matrix appears to cause nucleation in the droplets at the interface. Decreasing the PA6 droplet size results in slower overall crystallization rates.     

PA6/ABS合金的研制

应用Brabender挤出机制备ABS接枝物ABS g MAH,讨论了反应过程中温度、转速、单体MAH和引发剂DCP用量对接枝率的影响,并研究了接枝物对PA6/ABS合金的增容作用,用扫描电镜观察了分散相的微观形态。实验表明,在合适的温度下,转速为30r/min、DCP用量为1%、MAH用量为5%时,ABS g MAH的接枝率可达2 3%;PA6/ABS/ABS g MAH共混物配比为90∶8∶15时,合金的冲击韧性有较大提高,其它性能也有所改善。