MAH—g—PP对PP／EVAL共混体系的增容作用

系统研究了不同组成及配比的马来酸酐接枝聚丙烯（ＭＡＨ－ｇ－ＰＰ）及其用量对聚丙烯（ＰＰ）与乙烯－乙烯醇共聚物（ＥＶＡＬ）的共混体系（ＰＰ／ＥＶＡＬ）力学性能借用Ｂｒａｂｅｎｄｅｒ塑化仪测试了ＰＰ／ＥＶＡＬ／ＭＡＨ－ｇ－ＰＰ共混体系的加工性能。结果表明,ＭＡＨ－ｇ－Ｐ接枝物对ＰＰ／ＥＶＡＬ共混体系有较好的增容作用,适量加入,可使ＰＰ／ＥＶＡＬ共混体系的力学性能明显提高,而加工性能基本不变。     

新型聚丙烯固相接枝物增容聚丙烯／尼龙6共混物的研究

研究了聚丙烯与马来酸酐,甲基丙烯酸甲酯及第三单体的固相接枝共聚物「ＰＰ－ｇ（ＭＡＨ－ＭＭＡ－ＴＭ）」对聚丙烯／尼龙６（ＰＰ／ＰＡ６）共混物的增容作用。结果表明,新表明ＰＰ固相接枝物能有效地改善ＰＰ／ＰＡ６共混物的相容性,增加两相界面的粘合作用,显著提高共混物的力学性能,增容后体系假塑性增加,熔体粘度上升,活化能增加。     

低密度聚乙烯接枝烯基双酚A醚对HDPE／PC共混体系性能的影响

本文采用烯基双酚Ａ醚接枝低密度聚乙烯（ＬＤＰＥ－ｇ－ＤＢＡＥ）作为高密度聚乙烯／聚碳酸酯（ＨＤＰＥ／ＰＣ）共混体系的增容剂,初步研究了ＬＤＰＥ－ｇ－ＤＢＡＥ对ＨＤＰＥ／ＰＣ体系性能的影响。通过对共混物形态观察、耐热性能及力学性能测试,发现ＬＤＰＥ－ｇ－ＤＢＡＥ对ＨＤＰＥ／ＰＣ体系有良好的增容效果;并发现了增容剂的最佳用量质量比大致为１０％,提高增容剂的接枝率更有利于改善共混物的性能。６５／３５ＨＤＰＥ／ＰＣ共混物的ＨＤＴ为９２℃,拉伸强度３０２ＭＰａ,冲击强度２９８ｋＪ／ｍ２,分别比未加增容剂时的８２℃,２７３ＭＰａ和１５５ｋＪ／ｍ２有较大提高。     

PBT/PP/PP-MAH三元共混体结晶性质的研究

利用ＤＳＣ研究ＰＢＴ／ＰＰ／ＰＰ－ＭＡＨ三元共混体的结晶性质,结果表明：ＰＰ和ＰＢＴ相互影响分别结晶。在ＰＰ结晶过程中,ＰＢＴ起异相成核剂作用,使ＰＰ结晶速率增大,ＰＰ的Ｔｍ下降,Ｔｃ升高;而在ＰＢＴ的结晶过程中,ＰＰ的熔体起稀释剂的作用,促进ＰＢＴ结晶成核过程,使ＰＢＴ的Ｔｍ下降,Ｔｃ升高。ＰＰ－ＭＡＨ的加入,阻碍了ＰＰ大分子链向晶核的移动,同时改善了共混体的相容性。甚至在较大的ＰＢＴ加入比例（２８％）下,仍能促进协同效应和共同结晶。     

聚苯醚／PA6／弹性体多相共混物的形态结构和冲击性能研究

以ＳＥＢＳ,ＳＥＢＳ－ｇ－ＭＡＨ,ＰＯＥ－ｇ－ＭＡＨ作为增韧改性剂,单独或并用对聚苯醚（ＰＰＯ）／ＰＡ６共混物进行增韧。ＴＥＭ的结果显示,在所制备的多相体系中,ＳＥＢＳ大多被包容在ＰＰＯ分散要中;而ＳＥＢＳ－ｇ－ＭＡＨ和ＰＯＥ－ｇ－ＭＡＨ均分散在ＰＡ６的基体中,形成了多种形态结构。冲击断面下方应力发白区的ＴＥＭ照片上有大量的空穴,表明弹性体的空穴化是诱发剪切带,从而吸引能量的根源。     

PP／EPDM共混体系界面的研究

本文采用马来酸酐对三元乙丙橡胶（ＥＰＤＭ）进行熔融接枝改性,将性后的ＥＰＤＭ与聚丙烯（ＰＰ）共混,对ＰＰ／ＥＰＤＭ和ＰＰ／ＥＰＤＭ－ｇ－ＭＡＨ两种共混体系的界面状况进行了对比。运用Ｈｕｇｇｉｎｓ参数、界面张力参数对界面状况进行了表征;运用扫描电镜（ＳＥＭ）和偏光显微镜对共混物的冲击断口形貌以及结晶情况进行了观察与分析;探讨了界面状况与共混物力学性能以及流变性能间的关系。     

PC／PE共混体系中增容剂最佳用量的确定

本文以聚碳酸酯（ＰＣ）／聚乙烯（ＰＥ）／聚乙烯蜡接技马来酸酐（ＰＥＷ－ｇ－ＭＡＨ）三元共混物为体系，研究了第三组份增容剂ＰＥＷ－ｇ－ＭＡＨ用量。共混物两相之间界面张力和共混物力学性能之间的相互关系。论证了通过测量高聚物之间界面张力来确定第三组份增容剂的最佳用量的技术途径。     

EAA-g-PEOX对PBT/PP共混体系增容作用的研究

利用ＳＥＭ、ＤＳＣ及力学测试等分析方法,研究了增容剂ＥＡＡ－ｇ－ＰＥＯＸ及扩链剂ＰＢＯ对ＰＢＴ／ＰＰ共混物的形态结构和力学性能的影响。结果表明,ＥＡＡ－ｇ－ＰＥＯＸ明显改善了ＰＰ与ＰＢＴ的相容性,使ＰＰ较均匀地分配在基体中。     

PA1010／PP—g—ATBS／PP共混体系的形态与性能

采有向向双螺杆杆挤出机制备了不同组成的ＰＡ１０１０／ＰＰ及ＰＡ１０１０／ＰＰ－ｇ－ＡＴＢＳ／ＰＰ的共混物。采用聚丙烯接枝丙烯酰胺基甲基丙烷磺酸共聚物（ＰＰ－ｇ－ＡＴＢＳ）作为增容剂来研究对ＰＡ１０１０／ＰＰ共混体系形态与力学性能的影响，研究不同增容剂含量对ＰＡ１０１０／ＰＰ共混物的力学性能，形态结构的影响。     

PP－g－MAH原位反应增容PP／PA－6共混纤维的研究

为探索聚丙烯（ＰＰ）纤维纺后染色的新途径，将少量尼龙－６（ＰＡ－６）与聚丙烯共混，并用马来酸酐枝聚丙烯（ＰＰ－ｇ－ＭＡＨ）对该共混物进行反应性增容，得到了较为满意的结果。本文着重研究了ＰＡ－６用量在２０％以下时，增容剂用量及不同ＰＰ／ＰＡ－６共混比对共混物的亚微形态，流变性能，结晶性能等的影响，并对共混物的染色性能作了初步探讨     

Non-isothermal crystallization kinetic and compatibility of PTT/PP blends by using maleic anhydride grafted polypropylene as compatibilizer

The crystallization behaviors, non-isothermal crystallization kinetics, and the morphology of poly(trimethylene terephthalate)/Polypropylene (PTT/PP) blends using a maleic anhydride grafted polypropylene (PP-g-MAH) as a compatibilizer were investigated by differential scanning calorimeter (DSC) and scanning electron microscope (SEM), respectively. The results suggested that the blends exhibited different crystallization and melting behaviors due to different content of PP-g-MAH. All of the DSC curves of the blends exhibited two exothermic peaks and endothermic peaks. The commonly used Avrami equation modified by Jeziorny, Ozawa theory and the method developed by Mo were used, respectively, to fit the primary stage of non-isothermal crystallization process. The results suggested that the crystallization rate of PTT component was increased, whereas, that of PP component was retarded with the introduction of PP-g-MAH. The effective activation energy was calculated by differential iso-conversional method developed by Vyazovkin. The SEM result suggested that the introduction of PP-g-MAH greatly improved the compatibility between PTT and PP, and decreased the size of dispersed particles.     

马来酸酐接枝物对PE/PA6共混物相容性的影响

采用熔融共混法制备了PP/PA6/POE-g-MAH和PP/PA6/PP-g-MAH共混物。通过扫描电子显微镜(SEM)、差示扫描量热(DSC)仪分析和力学性能测试研究了增容剂POE-g-MAH和PP-g-MAH对PP/PA6共混物相容性、形态结构和宏观力学性能的影响。结果表明,在PP/PA6共混体系中分别加入POE-g-MAH和PP-g-MAH不仅能显著改善两相界面的相容性,减小分散相的粒径,而且能使共混物的力学性能显著提高。当增容剂的用量为5份时,PP/PA6共混物有较好的综合力学性能。POE-g-MAH和PP-g-MAH增容PP/PA6共混体系非等温结晶行为的研究表明,POE-g-MAH和PP-g-MAH均能促进PA6对PP基体的异相成核作用。     

Miscibility study on blend of thermotropic liquid crystalline polymers and polyester

The miscibility of thermotropic liquid crystalline polymers (TLCPs) and polyester blends was investigated with thermal and morphological analyses, as well as transesterification. TLCPs composed of 80 mol % para‐hydroxybenzoate (PHB) and 20 mol % poly(ethylene terephthalate) (PET) or 60 mol % PHB and 40 mol % PET, and polyesters such as PET and poly(ethylene 2,6‐naphthalate) (PEN) were melt blended in an internal mixer. DSC analyses were performed to investigate the thermal transition behavior and to obtain thermodynamic parameters. All the blends showed only a single glass‐transition temperature, which means they are partially miscible in the molten state. The Flory–Huggins interaction parameter was calculated employing the Nishi–Wang approach, and negative values were obtained except for the P(HB8‐ET2)/PEN blends. Transesterification was investigated using ¹H‐NMR, and the change of chemical shift compared to pure PET or P(HB‐ET)s was observed in the P(HB‐ET)/PET blends. An intermediate chemical shift value (4.83 ppm) was observed in the P(HB6‐ET4)/PEN blends, which indicates transesterification occurred. The fractured surface morphology of scanning electron micrographs showed that the interfaces between the LC droplets and matrix were not distinct. © 2003 Wiley Periodicals, Inc. J Appl Polym Sci 87: 1842–1851, 2003     

聚酯/热致液晶聚合物体系的非等温结晶动力学研究

热致性液晶共聚酯PET／60PHB组分对PET及PBT在两种共混体系中的非等温结晶行为的影响用DSC方法进行了研究，并用Ozawa方法处理了动力学数据。随共混体系中LCP含量的增加，PET的Avrami指数值n趋于降低而PBT的n值趋于增加，表明在非等混结晶条件下．对不同组成的共混物体系有着不同的成核和晶体生长的机理．     

PP-g-MAH对PA6/PP共混体系性能的影响

以PP-g-MAH为相容剂,研究了PP-g-MAH对PA6/PP共混体系性能的影响。探讨了PP-g-MAH对PA6/PP共混物增容作用,提高共混物的各项性能指标。当PP-g-MAH为4份时,共混物的力学性能最好,当PA6/PP=90/10时,其力学性能有最大值;SEM照片显示,未加PP-g-MAH时,PP在PA6基体上分散不均,颗粒大,当加入适量的PP-g-MAH(4份)时,PP分散比较均匀,颗粒尺寸明显降低。以PP-g-MAH4份,PA6/PP=80/20制备的共混物,吸水率约是PA6的15%:冲击强度、热变形温度分别比PA6、PP提高了72%和106%,13.5℃和5.5℃。     

Rheological behavior of polyester blend and mechanical properties of the polypropylene–polyester blend fibers

The article deals with method of preparation, rheological properties, phase structure, and morphology of binary blend of poly(ethylene terephthalate) (PET)/poly(butylene terephthalate) (PBT) and ternary blends of polypropylene (PP)/(PET/PBT). The ternary blend of PET/PBT (PES) containing 30 wt % of PP is used as a final polymer additive (FPA) for blending with PP and subsequent spinning. In addition commercial montane (polyester) wax Licowax E (LiE) was used as a compatibilizer for spinning process enhancement. The PP/PES blend fibers containing 8 wt % of polyester as dispersed phase were prepared in a two‐step procedure: preparation of FPA using laboratory twin‐screw extruder and spinning of the PP/PES blend fibers after blending PP and FPA, using a laboratory spinning equipment. DSC analysis was used for investigation of the phase structure of the PES components and selected blends. Finally, the mechanical properties of the blend fibers were analyzed. It has been found that viscosity of the PET/PBT blends is strongly influenced by the presence of the major component. In addition, the major component suppresses crystallinity of the minor component phase up to a concentration of 30 wt %. PBT as major component in dispersed PES phase increases viscosity of the PET/PBT blend melts and increases the tensile strength of the PP/PES blend fibers. The impact of the compatibilizer on the uniformity of phase dispersion of PP/PES blend fibers was demonstrated. © 2006 Wiley Periodicals, Inc. J Appl Polym Sci 102: 4222–4227, 2006     

PP/纳米SiO2/PP-g-MAH复合材料的研究

通过熔融共混法制备了PP/纳米SiO2/PP-g-MAH复合材料。研究了纳米SiO2和PP-g-MAH用量对PP基体性能的影响。通过力学性能测试、DSC热分析和SEM照片观测对PP/纳米SiO2和PP/纳米SiO2/PP-g-MAH复合材料的结构和性能进行了系统的研究。结果表明:2%的纳米SiO2和10%PP-g-MAH有较好的协同效应。可以使复合材料的缺口冲击强度提高80%,拉伸强度提高12.5%。DSC表明,纳米SiO2对PP基体有异相成核作用。SEM电镜分析得出,经表面改性的纳米SiO2均匀地分散于PP基体中,从而起到良好的改性作用。     

不同增容剂对聚酰胺1010/聚丙烯共混物的增容作用研究

采用熔体共混的方法制备了三种增容剂增容的聚酰胺1010/聚丙烯（PA1010/PP）共混物,通过傅里叶变换红外光谱（FTIR）、力学性能和差示扫描量热（DSC）测试,对马来酸酐接枝乙烯-辛烯共聚物（POE-g-MAH）、马来酸酐接枝聚丙烯（PP-g-MAH）和乙烯-丙烯酸丁酯-甲基丙烯酸缩水甘油酯共聚物（PTW）对PA1010/PP共混物的增容作用进行了比较研究。结果表明,和非增容体系相比,PP-g-MAH、POE-g-MAH和PTW的拉伸强度分别是非增容体系的125 %、89 %和94 %,冲击强度分别是非增容体系的140 %、200 %和200 %,PTW具有较好的增容效果。     

动态固化PP /PP-g-MAH /EP共混物非等温结晶动力学研究

利用差示扫描量热方法研究了马来酸配接枝聚丙烯(PP-g-MAH)增容动态固化聚丙烯(PP) /环氧树脂(EP)共混物非等温结晶过程,并运用(hawa方程和Kissinger方程进行相关数据处理,同时研究共混物晶体结构。结果表明,动态固化PP/PP-g-MAH/EP共混物中EP颗粒可明显促进PP的结晶,(hawa方程可以有效处理PP和共混物非等温结晶过程,在相同温度下共混物中PP的结晶速率常数[K}(T)〕大于纯PP的[K} (T)]。依据Kissinger方程,共混物中PP的结晶活化能(4E)明显小于纯PP的,在EP含量为20份(质量份数,下同)时,4E有一极小值。偏光显微镜显示PP的晶粒是典型的球形结构,其晶粒尺寸明显大于动态固化PP /PP-g-MAH/EP共混物中PP晶粒尺寸。     

Compatibilization by main‐chain thermotropic liquid crystalline ionomer of blends of PBT/PP

The miscibility and mechanical properties of the blends of polybutylene terephthalate (PBT) and polypropylene (PP) with a liquid crystalline ionomer (LCI) containing a sulfonate group on the terminal unit as a compatibilizer were assessed. SEM and optical microscopy (POM) were used to examine the morphology of blends of PBT/PP compatibilized by LCI. DSC and TGA were used to discuss the thermal properties of PBT/PP blends with LCI and without LCI. The experimental results revealed that the LCI component affect, to a great extent, the miscibility and crystallization process and mechanical property of PBT/PP blends. The fact is that increasing LCI did improve miscibility of PBT/PP blends and the addition of 1% LCI to the PBT/PP blends increased the ultimate tensile strength and the ultimate elongation. © 2002 Wiley Periodicals, Inc. J Appl Polym Sci 85: 1110–1117, 2002