聚丙烯接枝物反应挤出增容PP/PA6共混物的形态结构

采有PP熔融接枝MAH和不饱和羧酸混合单体通过反应挤出增容PP/PA6共混物，研究了增容共混物的形态结构。SEM、TEM观察表明，接枝物能明显降低共混物的分散相尺寸，改善体系的分散状况，提高共混物两相的相容性；增容共混物的两相界面结合改善，相界面变得模糊。WAXD、DSC测试表明，用该接枝物增容后的共混物，组分的Xc下降，分散相微晶尺才减小。研究结果表明该接枝物是PP/PA6共混体系的有效增容剂。     

三元乙丙橡胶接枝马来酸酐共聚物对PA6/PP共混物结构和性能的影响

通过Molau实验、扫描电子显微镜(SEM)观察和力学、热学性能测试,研究了三元乙丙橡胶接枝马来酸酐共聚物(EPDM-g-MAH)增容剂在PA6/PP共混物中的作用.重点讨论了PA6/PP配比、EPDM-g-MAH用量对共混物结构、冲击强度、热变形温度和吸水率的影响.实验结果表明:EPDM-g-MAH是一种反应型增容剂.适量的EPDM-～MAH加入可很好地改善PA6和PP两相的相容性,减小PP分散相的粒径,提高PA6、PP两相界面的相互作用.当PA6/PP/EPDM-g-MAH质量比为80/20/(10～15)时,共混物综合性能最好.和纯PA6相比,共混物冲击强度提高3倍以上,热变形温度提高7℃以上,吸水率减少2/3.     

多单体熔融接枝PP增容PP/PVC共混体系的力学和流变性能研究

合成了一种新型的多单体接枝物PP－g-(St-co-MMA),研究了其对PP／PVC共混体系的增容作用。讨论了接枝物用量对共混物力学性能和流变行为的影响，并通过扫描电镜（SEM）对共混物的亚微观相结构进行了分析。结果表明，该接枝物对PP／PVC共混体系有较好的增容效果，材料的力学性能在接枝物用量为6份时出现峰值；加入接枝物能使体系的熔体粘度增加，并且在所研究的温度和压力范围内共混物熔体呈典型的假设性流体特性。     

PPO/PA6纳米共混物的制备及结构表征

采用一种新的制备PPO／PA6共混物的方法，从己内酰胺（CL）单体出发，在聚苯醚（PPO）存在下阴离子开环聚合己内酰胺，由于其中一部分PPO主链上接枝了活性苯酯基团，能促进PA6链在其上增长，从而同时形成了PA6均聚物与PPO—g—PA6接枝共聚物，实现了原位聚合与原住增容的同步实施，并用SEM对其微观相形态结构进行了研究，控制共混条件可制备PA6纳米分散的PPO／PA6共混物。     

PA6/PP共混物的研究进展

对PA6 /PP共混物的研究进展进行了综述。重点介绍了所用增容剂的种类及增容机理、共混体系结构和性能的研究状况 ,并对PA6 /PP共混物今后的研究方向提出了建议。     

力化学方法制备PP-g-HMA增容PA6/PP/硅灰石复合材料的形态和力学性能

以力化学方法制备的N-羟甲基丙烯酰胺接枝聚丙烯(PP-g-HMA)作尼龙6(PA6)/聚丙烯(PP)共混体系的增容剂,将增容尼龙6/聚丙烯共混体系与硅灰石复合.研究了复合材料的形态结构、硅灰石用量、偶联剂种类和用量以及增容剂等对复合材料的力学性能的影响.结果表明,PP-g-HMA能提高PA6/PP/硅灰石复合材料的力学性能,而KH-550和ON-330两种偶联剂复配使用则可以显著提高PP-g-HMA增容PA6/硅灰石复合材料的力学性能.     

增容剂对PVC/PA6共混物性能的影响

分别以乙烯醋酸乙烯酯接枝马来酸酐(EVA-g-MAH)、丙烯晴-丁二烯-苯乙烯三元共聚物接枝马来酸酐(ABS-g-MAH)及聚乙烯接枝马来酸酐(PE-g-MAH)三种聚合物为增容剂制备了聚氯乙烯/聚酰胺6(PVC/PA6)共混物,采用扫描电子显微镜(SEM)、动态力学分析(DMA)及力学性能测试研究了相容剂对PVC/PA6(80/20)的相形态结构及力学性能的影响。结果表明,三种相容剂对PVC/PA6都具有明显的增容作用,但5%EVA-g-MAH增容PVC/PA6(80/20)的分散相尺寸最小最均匀;三种增容剂增容的PVC/PA6共混物都只有一个玻璃化转变温度(Tg),但EVA-g-MAH增容共混物的Tg略向高温偏移;力学性能测试结果显示,5%的EVA-g-MAH增容的PVC/PA6共混物的缺口冲击强度和拉伸强度分别提高了18%和200%,达到了3.8kJ/m2和46MPa。     

PP/PA-6聚合物共混物的介电性能与微观结构(Ⅱ)组成及相容性的影响

用Haake-90型双螺杆挤出机，采用熔融共混工艺制备了一系列组成比，增容剂含量不同的PP/PA-6共混物。用TR-10C型介电损耗测量仪测试了这些材料的介电性能。用SEM研究了共混物组成与增容剂用量对共混物微观结构的影响。通过对上述材料微观结构形貌和介电谱图的分析。讨论了该体系介电性能与微观结构的关系。发现分散相PA-6粒径大小，分散程度及与PP基体界面粘结程度对共混体系的介电性能有显著影响，描述了共混物组成，增容剂含量与共混体系微观结构和介电性能的关系。     

PP-g-MAH对PA6/PP/TLCP三元共混物的增容改性作用

研究了PP-g-MAH对PA6／PP／TLCP三元共混体系的增容作用以及对共混物流变性能和力学性能的影响。通过共混物的DSC、SEM、POM、流变性能和力学性能测试，结果表明，PP－g-MAH对共混体系有明显的增容作用，共混物的力学性能（拉伸强度和冲击强度）得到提高；由于TLCP的加入，共混物的熔体粘度大大低于PA6的熔体粘度。     

(PE-MA)-g-PA6对PA6/EPDM的共混增容以及形态结构与性能的影响

本文研究了不同接枝率的增容剂PE-MA的用量对PA6/EPDM共混物的力学性能和形态结构的影响,并与PP-MA的增容效果作了比较。当PA6/EPDM/PE-MA为80/20/12时,共混物在干态常温下的Izod冲击强度是纯PA6的13倍。这时的分散相粒子变得细小,相界面摸糊弥散。PE-MA的增容效果远好于PP-MA。     

力化学方法制备PP—g—HMA增容PA6／PP／硅灰石复合材料的形？…

以力化学方法制备的Ｎ－羟甲基丙烯酰胺接枝聚丙烯（ＰＰ－ｇ－ＨＭＡ）作尼龙６（ＰＡ６）／聚丙烯（ＰＰ）共混体系的增容剂,将增容尼龙６／聚丙烯共混体系与硅灰石复合。研究了复合材料的形态结构、硅灰石用量、偶联剂种类和用量以及增容剂等对复合材料的力学性能的影响。结果表明,ＰＰ－ｇ－ＨＭＡ能提高ＰＡ６／ＰＰ／硅灰石复合材料的力学性能,而ＫＨ－５５０和ＯＮ－３３０两种偶联剂复配使用则可以显著提高ＰＰ－ｇ－ＨＭ     

Effect of the processing method on the mechanical properties and morphology of compatibilized PA6/LDPE blends

In this work, the effect of the processing method on the mechanical properties and morphology of compatibilized PA6/LDPE blends was investigated. The blends were prepared by two processing methods: Injection and Extrusion followed by Injection. The compatibilizers used were polyethylene grafted with acrylic acid (PEgAA) and polyethylene grafted with maleic anhydride (PEgMA). The results showed that in both processing methods the impact strength and elongation at break of the compatibilized blends were greater than those of the uncompatibilized ones. For the blends prepared by injection, the impact strength of PA6/PEgMA/LDPE blend was greater than that of PA6/PEgAA/LDPE blend. For the blends prepared by extrusion followed by injection, the impact strength of the PA6/PEgAA/LDPE blend was greater than that of PA6/PEgMA/LDPE blend. SEM analysis showed that the morphology of the PA6/PEgAA/LDPE blend prepared by extrusion followed by injection was more stable than that of the same blend prepared only by injection.     

Influence of reactive compatibilizers on the rheometrical and mechanical properties of PA6/LDPE and PA6/HDPE blends

In this work, the influence of reactive compatibilizers on the rheometrical and mechanical properties of polyamide 6/low density polyethylene (PA6/LDPE) and polyamide 6/high density polyethylene (PA6/HDPE) blends was investigated. Polyethylene grafted with maleic anhydride (PEgMA), polyethylene grafted with acrylic acid (PEgAA), and ethylene-methyl acrylate-glycidyl methacrylate (EMA-GMA) were used as compatibilizers. The blends were characterized by torque rheometry, mechanical properties, and morphology. Rheometrical properties results show that PEgMA and PEgAA compatibilizers are more reactive with PA6 than EMA-GMA. Mechanical properties and scanning electron microscopy analysis results show that EMA-GMA compatibilizer is as effective as PEgMA and PEgAA for PA6/LDPE blend. For PA6/HDPE blend, PEgAA and EMA-GMA compatibilizers proved to be as effective as PEgMA. For PA6/HDPE blend compatibilized with PEgAA, an intriguing “web” or “bridge” like structure was observed.     

Effect of different polypropylenes and compatibilizers on the rheological,mechanical and morphological properties of nylon 6/PP blends

In this work, the rheological, mechanical and morphological properties of nylon 6/polypropylene compatibilized blends were investigated. Two types of polypropylene were used. One with MFI of 40 g/10 min (PP H103) and the other with MFI of 3.5 g/10 min (PP H503). The compatibilizers used were polypropylene grafted with 6% of acrylic acid (PPgAA) and polypropylene grafted with 1% of maleic anhydride (PPgMA). The blends composition was 80/20 (wt%) for the PA6/PP binary blends and 80/10/10(wt%) for the nylon 6/PPgAA/polypropylene and nylon 6/PPgMA/polypropylene ternary blends. Torque rheometry analysis showed that when PPgAA and PPgMA were added to nylon 6/polypropylene blends, there was an increase in the torque, indicating that reactive compatibilization has occurred. There is no influence of the polypropylene MFI on the mechanical properties of the uncompatibilized and compatibilized blends. The impact strength of the blends containing PPgMA were greater than those of the blends containing PPgAA. The blends containing PPgAA are unstable. SEM analysis showed that PPgMA improves considerably the adhesion between PA6/PP phases, leading to good mechanical properties.     

LLDPE-g-AA对LLDPE/PA6合金体系的增容作用

以挤出共混方法制备了不同组分的LLDPE/PA6合金材料,利用DSC、偏光显微镜等手段研究了LLDPE-g-AA对LLDPE/PA6共混体系的增容作用,并讨论了LLDPE-g-AA对LLDPE/PA6共混物的相容性及力学性能的影响。结果表明,LLDPE-g-AA的加入极为显著地增加了LLDPE/PA6体系两相界面的相互作用,当PA6加入量为10%,接枝物LLDPE-g-AA加入量为5%时,合金体系的冲击强度达到最高,较纯LLDPE增加了170%。     

PVC/PA1010/SBS-g-MAH共混体系研究

制备了ＳＢＳ－ｇ－ＭＡＨ接枝聚合物,并对其进行了表征,以ＳＢＳ－ｇ－ＭＡＨ作为ＰＶＣ／ＰＡ１０１０共混体系的增剂,对不同配比的ＰＶＣ／ＰＡ１０１０／ＳＢＳ－ｇ－ＭＡＨ共混体系的物理力学性能,流变性及差热性等进行了研究,结果表明,ＳＢＳ－ｇ－ＭＡＨ接枝聚合物对ＰＶＣ／ＰＡ１０１０共混体系起到了明显的增容作用,得到了缺口冲击强度及拉伸强度均较高的ＰＶＣ／ＰＡ１０１０／ＳＢＳ－ｇ－ＭＡＨ共混物。     

Compatibilizing effect of maleated polypropylene on the mechanical properties of injection molded polypropylene/polyamide 6/functionalized-TiO2 nanocomposites

TiO₂ nanoparticles were pretreated with excessive toluene-2,4-diisocyanate to synthesize TDI-functionalized TiO₂ (TiO₂-NCO), and then the polypropylene/polyamide 6/(PP/PA6, 70/30 wt%) blends containing 3 phr of the TDI-functionalized TiO₂ were prepared using twin-screw extruder followed by injection molding. Maleated polypropylene (PP-g-MAH) was used to compatibilize the blends. The mechanical properties of PP/PA6 blends based nanocomposites were studied through tensile and flexural tests. Scanning electron microscopy (SEM) and transmission electron microscopy (TEM) were used to assess the fracture surface morphology and the dispersion of the TDI-functionalized TiO₂, respectively. The dynamic mechanical properties of PP/PA6 based nanocomposites were analyzed by using dynamic mechanical thermal analyzer (DMTA). The strength and stiffness of the PP/PA6 compounds were improved significantly in the presence of PP-g-MAH. This has been attributed to the synergistic effect of TDI-functionalized TiO₂ and PP-g-MAH. The PP-g-MAH compatibilized PP/PA6 compounds showed a homogeneous morphology supporting the compatibility improvement between PP, PA6 and TDI-functionalized TiO₂. TEM results revealed that the TDI-functionalized TiO₂ nanoparticles were exfoliated and uniformly dispersed in blends matrix. Possible chemical interactions between PP, PA6, TDI-functionalized TiO₂ and PP-g-MAH were proposed based on the experimental work.     

正应力支配下混合顺序对PA6/HDPE/CNTs体系结构及性能的影响EI北大核心CSCD

利用自行研制的叶片式混炼装置,实现了正应力支配下聚合物复合体系的熔融共混。实验研究了混合顺序以及混合时间对高密度聚乙烯(HDPE)/尼龙6(PA6)/碳纳米管(CNTs)共混物的微观结构、流变特性、热性能及宏观力学性能的影响。结果表明:正应力支配作用能在短混合时间内实现PA6粒子和CNTs的均匀分散,分散效率高;相比于将HDPE,PA6,CNTs三者同时共混或者是先将PA6与CNTs混炼制成母料,再与HDPE共混这两种混合顺序,先将HDPE与CNTs混炼制成母料,再与PA6共混制得的共混物中分散相PA6粒径最小,分散更均匀,共混物的热性能以及力学性能更好。     

RSMA增容PA6/PP共混物的形态结构与增容机理

采用ＲＳＭＡ为增容剂制备了ＰＡ６／ＰＰ共混物,研究了ＲＳＭＡ增容ＰＡ６／ＰＰ共混物的形态结构和热行为以及晶态结构,并探讨ＲＳＭＡ增容ＰＡ６／ＰＰ共混物的增容机理结果表明,ＰＡ６／ＰＰ共混物为热力不相容的海岛型两相结构,ＲＳＭＡ的加入改善ＢＰＡ６与ＰＰ相间的相容性,使两相分均匀,分散度提高。ＲＳＭＡ对ＰＡ／ＰＰ共混物的增容机理可用界面－分散相复合模型描述。