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。     

共混工艺对ABS／PA6共混物聚集态结构及性能的影响

以苯乙烯-马来酸酐共聚物（SMA）为增容剂，研究了共混工艺对ABS／PA6共混物力学性能和聚集态结构的影响；并利用SEM研究了ABS／PA6冲击断面的形貌结构。研究表明：未加相容剂的ABS／PA6共混物，分散相易聚集，相容性差，力学性能最差，且有的孔洞直径大于4μm。加入反应性相容剂SMA后，PA6分散颗粒变小及更均匀地分散于ABS中，能显著改善ABS／PA6共混物的冲击，拉伸性能。在不同共混工艺下，力学性能最好的是通过ABS和SMA挤出，再与PA6挤出，注塑得到的ABS／PA6共混物；其次PA6／SMA挤出，再与ABS挤出，注塑的ABS／PA6共混物；接着是PA6／SMA／ABS一起挤出，注塑的ABS／PA6共混物；最后为PA6／ABS一起挤出，未加SMA，注塑的ABS／PA6共混物。     

PP/PA6复合材料力学性能的研究

研究了PA6用量对PP、PP／SiO2拉伸强度的影响以及不同相容剂PP-g-MAH、POE-g—MAH对PP／PA6共混体系力学性能、相容性和结构的影响。通过力学性能测试、DSC热分析和SEM观察，研究了复合材料的性能。研究结果表明：PA6的加入可以提高PP、PP／SiO2体系的拉伸强度；两种相容剂的加入都可使PP／PA6体系的相容性增加，但PP-g—MAH的加入主要表现为增强效果，而PP—MAH的加入主要表现为增韧效果。     

PP／PA6共混体系性能的研究

本文进行PP／PA6的共混改性，讨论了相容剂、PBT、玻纤和云母粉的加入对PP／PA6共混体系的影响。结果表明：POE—g—MAH是PP／PA6的有效相容剂，能显著提高PP／PA6的力学性能；云母粉的加入使体系的弹性模量提高，耐热性能增加。     

PP-g-MAH对聚丙烯/尼龙6共混体的影响

研究聚丙烯接枝马来酸酐相容剂对聚丙烯／尼龙6体系的增容作用;并讨论了PP-g-MAH对PP／PA6共混物的力学性能的影响。结果表明:PP-g-MAH能有效地增强PP／PA6共混体系两相界面的相互作用,改善PP和PA6的相容性,是效果较好的相容剂。     

尼龙6/尼龙66合金的性能研究

研究了相容剂、增韧剂对改性尼龙6／尼龙66合金性能的影响。研究结果表明，以EVA／PE－g－MAH为相容剂、以PA6和PA66为基料、以EAA及PE为得合增韧剂改性的PA6／PA66合金，其吸水率有较大降低，且综合性能较好。     

一步法多单体反应挤出PP/PA6增容体系研究

采用一步法将接枝单体马来酸酐(MAH)和苯乙烯(St)、引发剂过氧化二异丙苯(DCP)与聚丙烯(PP)、尼龙6(PA6)、乙烯辛烯共聚物(POE)等混匀后在双螺杆挤出机中就地反应增容，详细地讨论了MAH／St／DCP用量和PA6含量对共混体系拉伸性能和冲击性能的影响；通过扫描电镜(SEM)分析了MAH／St／DCP用量及PA6含量对共混物的亚微形态、相界面的影响；通过红外光谱(FTIR)的结果分析对PP／PA6共混物增容反应机理进行了初步探讨。结果表明：一步法添加MAH／St／DCP引起PP／PA6共混体系发生了酰亚胺化反应，生成了Pp—(St—MAH)—PA6接枝共聚物有很好的增容作用；PA6与基体PP的界面非常模糊，分散相的颗粒也变得均匀细小，约0．5μm，大大改善了两相之间的粘结；从而使得PP／PA6共混体系的力学性能有了较大的提高，PA6质量分数在20％，MAH／St／DCP添加1～4份时效果最佳，缺口冲击强度提高2倍左右，拉伸强度、断裂伸长率、无缺口冲击强度也有明显改善。     

PA6含量对PVC/PA6共混物形态结构与力学性能的影响

以EVA-g-MAH为相容剂,将PVC与自制的低熔点PA6共混制备了PVC/PA6共混物。通过扫描电子显微镜(SEM)和力学性能测试研究了PA6含量对PVC/PA6共混物形态结构及力学性能的影响。SEM分析结果显示:随着PA6含量的增加,PVC/PA6共混物的分散相尺寸逐渐增大,当PA6含量为10%时,共混物中分散相的分散尺寸最小为1μm;当PA6含量为50%时,共混物为两相共连续结构;当PA6含量为60%时,共混物中PA6为连续相,PVC为分散相。力学性能测试结果表明:当PA6含量为10%时,共混物的缺口冲击强度和拉伸强度都较PVC有明显提高,分别提高了约50%与30%,达到了6.29kJ/m2和60MPa。采用差示扫描量热仪(DSC)研究了PVC/PA6共混物的结晶温度,检测结果显示:PVC/PA6共混物呈现非晶结构。     

PC／PA6共混体系的耐溶剂性及其结晶行为的研究

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。     

原位聚合法制备马来酸酐化EPDM/PA6共混型热塑性弹性体

采用电子同步转移反应（Ene Reaction）制备了马来酸酐化EPDM（EPDM—g—MAH），并在EPDM—g—MAH中原位聚合己内酰胺生成尼龙6（PA6）制备了EPDM—g—MAH／PA6共混型热塑性弹性体。采用X-射线衍射法（XRD）和差示扫描量热法（DSC）研究了原位聚合法和直接共混法制备的EPDM—g—MAH／PA6共混体系的结晶行为。研究表明，230℃下进行阴离子聚合得到的PA6为β-介晶型；EPDM对这种分散在橡胶相中的PA6的结晶具有异相成核作用；原位聚合可在反应增容的基础上使得共混物中PA6的结晶焓进一步降低。动态力学分析频率谱研究表明，增容和原位聚合在削弱PA6组分对刚度贡献的同时可提高橡胶相的弹性响应。     

Morphology and properties of PBT/nylon 6/EVA‐g‐MAH ternary blends prepared by reactive extrusion

Morphology and properties of poly(butylene terephthalate) (PBT)/nylon 6 (PA6)/EVA‐g‐MAH ternary blends were investigated. The blends were prepared in a corotating, intermeshing, twin‐screw extruder. The incorporation of maleic anhyride (MAH) grafted onto ethylene‐vinyl acetate copolymer (EVA) (EVA‐g‐MAH) in the PBT/PA6 binary blends decreased the tensile and flexural strength but increased the impact strength, while the mechanical properties of the PBT/PA6 blends were decreased with increasing PA6 content regardless of the presence or absence of the EVA‐g‐MAH. The morphology studies of the ternary blends showed gross phase separation. The rheological properties of the ternary blends suggested that excessively high reactivity between amine end groups of PA6 and MAH grafted onto EVA makes the compatibility between PBT and PA6 worse, although EVA‐g‐MAH was expected to work as a compatibilizer for PBT/PA6 blends. The degree of reactivity between functional groups in PBT, PA6, and EVA‐g‐MAH was also examined by investigating the effect of blending sequence on the properties of the ternary blends.     

Interface modification of compatibilized polyethylene terephthalate/polypropylene blends: Effect of compatibilization on thermomechanical properties and thermal stability

Polyethylene terephthalate (PET) and polypropylene (PP) are incompatible thermoplastics because of differences in chemical structure and polarity, hence their blends possess inferior mechanical and thermal properties. Compatibilization with a suitable block/graft copolymer is one way to improve the mechanical and thermal properties of the PET/PP blend. In this study, the toughness, dynamic mechanical analysis (DMA), and thermogravimetric analysis (TGA) of PET/PP blends were investigated as a function of different content of styrene‐ethylene‐butylene‐styrene‐g‐maleic anhydride (SEBS‐g‐MAH) compatibilizer. PET, PP, and SEBS‐g‐MAH were melt‐blended in a single step using the counter rotating twin screw extruder with compatibilizer concentrations of 0, 5, 10, and 15 phr, respectively. The impact strength of compatibilized blend with 10 phr SEBS‐g‐MAH increased by 300% compared to the uncompatibilized blend. Scanning electron microscope (SEM) micrographs show that the addition of 10 phr SEBS‐g‐MAH compatibilizer into the PET/PP blends decreased the particle size of the dispersed PP phase to the minimum level. The improvement of the storage modulus and the decrease in the glass transition temperature of the PET phase indicated an interaction among the blend components. Thermal stability of the PET/PP blends was significantly improved because of the addition of SEBS‐g‐MAH. J. VINYL ADDIT. TECHNOL., 23:45–54, 2017. © 2015 Society of Plastics Engineers     

Preparation of HDPE/SEBS‐g‐MAH and its effect on mechanical properties of HDPE/wood flour composites

In this article, high density polyethylene/styrene‐ethylene‐butylene‐styrene block copolymer blends (HDPE/SEBS) grafted by maleic anhydride (HDPE/SEBS‐g‐MAH), which is an effective compatibilizer for HDPE/wood flour composites was prepared by means of torque rheometer with different contents of maleic anhydride (MAH). The experimental results indicated that MAH indeed grafted on HDPE/SEBS by FTIR analysis and the torque increased with increasing the content of maleic anhydride and dicumyl peroxide (DCP). Styrene may increase the graft reaction rate of MAH and HDPE/SEBS. When HDPE/SEBS MAH was added to HDPE/wood flour composites, tensile strength and flexural strength of composites can reach 25.9 and 34.8 MPa in comparison of 16.5 and 23.8 MPa (without HDPE/SEBS‐g‐MAH), increasing by 157 and 146%, respectively. Due to incorporation of thermoplastic elastomer in HDPE/SEBS‐g‐MAH, the Notched Izod impact strength reached 5.08 kJ m^?2, increasing by 145% in comparison of system without compatibilizer. That HDPE/SEBS‐g‐MAH improved the compatibility was also conformed by dynamic mechanical measurement. Scanning electron micrographs provided evidence for strong adhesion between wood flour and HDPE matrix with addition of HDPE/SEBS‐g‐MAH. © 2007 Wiley Periodicals, Inc. J Appl Polym Sci 2007     

熔融法合成的HDPE-g-MHA与PA6相容性的研究

采用 IR、Molau实验、DSC、抽滤分析研究了 HDPE熔融接枝马来酸酐 ( HDPE-g-MAH)与PA6的相容性 ,研究表明 PA6分子链上的酰胺基与 HDPE-g-MAH的酸酐发生化学反应生成了共聚物HDPE-g-PA6。共聚物的形成增强了 HDPE与 PA6界面的相互作用。DSC显示 ,增容共混体系中 HDPE对PA6的熔融行为有明显的影响 ,使 PA6的熔融峰变宽 ,熔融温度向 HDPE移近。     

SEBS接枝MAH改性PA6物理性能研究

研究了PA6/SEBS和PA6/SEBS-g-MAH共混体系与PA6/SEBS/SEBS-g-MAH三元共混体系的力学性能与流变性能变化。结果表明,采用SEBS增韧尼龙6,控制SEBS和SEBS-g-MAH的比例,在SEBS总量为20%时能够制得超韧性的尼龙6,缺口冲击强度可达到90kJ/m2以上。PA6/SEBS表现出不相容共混体系的流变行为,PA6/SEBS-g-MAH共混体系高于共混物中任一组分的粘度,反映出共混后增强了两相的界面相互作用。三元共混体系的粘度表现为SEBS和SEBS-g-MAH共同作用结果。     

Rubber toughened polyamide 6: The influences of compatibilizer on morphology and impact properties

In this study, styrene-(ethylene-co-butylene)-styrene (SEBS) triblock copolymer (Kraton G-1652) was modified with maleic anhydride (MA). The maleated SEBS was used as compatibilizer for the blends of Nylon 6 (PA6) and SEBS. The morphology and impact strength of the blends were measured as functions of concentration and MA graft ratio of maleated SEBS. The compatibility and fracture mechanism of the blends were evaluated from the SEM micrographs of the xylene-etched surfaces and of fractured surfaces. Some of the blends exhibited an impact strength up to about 30 fold greater than neat PA6. The fracture involved both both cavitation and shear yielding. The mechanism of compatibilization of maleated SEBS in the ternary components blends was proposed.     

Morphological,mechanical, and rheological studies of PVC/ABS blends in the presence of maleic anhydride

A novel method of enhancing compatibility in PVC/ABS blends is the use of ABS‐grafted‐(maleic anhydride) (ABS‐g‐MAH) as a compatibilizer. In this study, maleic anhydride was grafted onto ABS (initiated by peroxide) in an internal mixer. Grafting degree was determined by a back‐titration method, and certain amounts of the resultant ABS‐g‐MAH were added to PVC/ABS blends during their melt blending in the mixer. The weight ratio of PVC to ABS was kept at 70:30. Evaluation of compatibilization was accomplished via tensile and notched Izod impact tests, scanning electron microscopy (SEM), and rheological studies. According to the SEM micrographs, better dispersion of the rubber phase and its finer size in properly compatibilized blends were indications of better compatibility. Besides, in the presence of a proper amount [5 parts per hundred parts of PVC (php)] of ABS‐g‐MAH, PVC/ABS blends showed significantly higher impact strengths than uncompatibilized blends. This result, in turn, would be an indication of better compatibility. In the presence of 5 php of compatibilizer, the higher complex viscosity and storage modulus, as well as a lower loss modulus and loss factor in the range of frequency studied, indicated stronger interfacial adhesion as a result of interaction between maleic anhydride and the PVC‐SAN matrix. J. VINYL ADDIT. TECHNOL., 2010. © 2010 Society of Plastics Engineers     

LDPE/SBS-g-MAN增韧PA-6和增容PA-6/LDPE的研究

对ＭＡＨ接枝ＬＤＰＥ／ＳＢＳ制备复合相容剂ＬＤＰＥ／ＳＢＳ ｇ ＭＡＮ及其对ＰＡ ６的增韧作用和对ＰＡ ６／ＬＤＰＥ的增容作用进行研究,并对菜混物的力学性能、微观形态结构进行了分析     

The Effect of Compatibilizer on Morphology and Mechanical Properties of PA6/UHMWPE Blends

Abstract

This work deal with the effect of compatibilizer on the morphological and mechanic properties of polyamide 6 and ultrahigh molecular weight polyethylene (PA6/UHMWPE) blends. The blends were prepared by means of a twin-screw extruder. The compatibilizer was produced by grafting maleic anhydride (MAH) onto high density polyethylene (HDPE). The resulting HDPE-g-MAH was used to prepare ternary blends of PA6/HDPE-g-MAH/UHMWPE by melt mixing. The size of domain of UHMWPE in PA6/HDPE-g-MAH/UHMWPE blends is much smaller than that in PA6/UHMWPE blends. It was found that mechanical properties of PA6/HDPE-g-MAH/UHMWPE blends obviously surpassed that of PA6/UHMWPE blends. These behavior could be attributed to chemical reactions between MAH in HDPE-g-MAH and terminal amino groups of PA6. Thermal analysis were performed to confirm the possible chemical reactions taken place during the blending process.     

EVA-g-MAH的制备及在聚合物共混相容中的应用

采用溶液接枝法合成得到乙烯-乙酸乙烯酯接枝马来酸酐聚合物（EVA-g-MAH）,利用核磁共振仪和红外光谱仪对产物进行分子链结构分析,结果表明：马来酸酐已成功接枝在EVA主链与酯基相连的叔碳原子上。通过调节马来酸酐（MAH）与EVA中乙酸乙烯酯（VA）单元的投料比,得到了不同接枝率（摩尔分数4.87%~12.3%）的产物。以EVA-g-MAH接枝共聚物为相容剂,通过聚合物加工制备了高密度聚乙烯（HDPE）/聚碳酸酯（PC）/EVA-g-MAH共混物,利用SEM对样品脆断面表面形貌进行对比观察,验证了EVA-g-MAH是HDPE/PC共混聚合物的良好相容剂。最后,研究了EVA-g-MAH对尼龙（PA6）/EVA共混物抗冲击强度的影响,当EVA-g-MAH加入质量分数为6%时对共混合金冲击强度提高最大。