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。     

SEBS/PPO共混物的相态结构及力学性能和流变性能 研究

将不同配比的苯乙烯-乙烯-丁二烯-苯乙烯嵌段共聚物（SEBS）/聚苯醚 （PPO）通过同向双螺杆挤出机进行熔融共混。应用原子力显微镜（AFM）观察了SEBS/PPO不同配比的相态结构,并比较了其力学性能,同时还比较了不同充油量的SEBS/PPO共混物的相态结构、力学性能和流变性能。结果表明,随着PPO含量的增加,亮点聚苯乙烯（PS）段逐渐增加,PPO和PS完全融合到一起,当SEBS/PPO＝80/20时乙烯-丁二烯（EB）段是连续相,PS相和PPO是分散相;当SEBS/PPO＝20/80时发生相反转,PPO变为连续相;随着PPO含量的增加,拉伸强度大幅度增加,断裂伸长率明显降低;随着充油量的增加,拉伸强度和断裂伸长率均有不同程度的下降;表观黏度随非牛顿剪切速率的增加逐渐降低。     

PPO／PA6／弹性体多相共混物的流变行为

采用Ｉｎｓｔｒｏｎ３２１１毛细管流变仪对不同用量的ＳＥＢＳ和ＰＯＥ－ｇ－ＭＡＨ两种弹性体增韧改性的ＰＰＯ／ＰＡ６多相共混物的流变行为进行了测试。对比了两种弹性体在不同温度和剪切速度下对共混体系表观粘度的影响。     

EVA增容HDPE/PLA共混体系的研究

以乙烯-醋酸乙烯共聚物(EVA)为增容剂,采用熔融共混法制备了高密度聚乙烯(HDPE)/聚乳酸(PLA)/EVA复合材料,研究了EVA用量对复合材料力学性能及热性能的影响,并利用扫描电镜分析了复合材料的微观形态。结果表明:随着EVA用量的增加,复合材料的断裂伸长率及冲击强度逐渐增加;另外SEM结果显示,EVA可以改善HDPE与PLA的相容性,但EVA的加入对复合材料热性能影响较小。     

新型多单体接枝物增容PP/PVC共混体系的研究

自制了多单体接枝物PP g (St co MMA) ,并利用其增容PP/PVC共混体系。讨论了共混物组成、相容剂用量在不同温度、不同压力下对其流变行为的影响。实验结果表明 ,在所研究的温度和压力范围内 ,加入PP g (St co MMA)增容PP/PVC共混体系后 ,共混物熔体呈典型的假塑性流体特性 ,粘流活化能增加 ,非牛顿性有增大的趋势。共混体系的力学性能提高 ,SEM照片证明了多单体接枝物对PP/PVC的增容作用     

Preparation and Properties of PB-1/PP Blends

Crystallization behavior, dynamic mechanical properties, mechanical properties and rheological properties of isotactic polybutene-1/polypropylene (PB-1/PP) blends prepared by melt-blending the two components through Brabender extruder were mainly studied via POM, DSC, DMA, capillary rheometer and so on, respectively. The results indicated that after adding PP in PB-1: size of the spherical crystal and degree of crystallization of PB-1 in the blends decreased, its melt temperature and crystallization temperature unchanged; tensile property of the blends was decreased, but impact and flexural properties were improved; change of the melt viscosity of the blends with the shear rate was more sensitive than pure PB-1.     

SBS和纳米CaCO_3增容PP/SAN体系的研究

研究了苯乙烯-丁二烯-苯乙烯嵌段共聚物(SBS)单独添加和与纳米CaCO3复配添加对聚丙烯/苯乙烯-丙烯腈共聚物(PP/SAN)共混体系相容性的影响。结果表明:SBS用量为6 phr时,体系的分散性尺寸降低,分布均匀性改善,有一定的增容效果,但当其用量为10 phr时,体系的相容性变差;SBS和纳米CaCO3先在双辊塑炼机上混炼后再复配添加,当纳米CaCO3/SBS质量比为2/1、总添加量为10 phr时,增容效果好于单独添加SBS的体系;改变纳米CaCO3/SBS的配比体,系的拉伸强度和缺口冲击强度变化不大。     

PP/EVOH共混物结构与性能研究

采用丙烯酸接枝聚丙烯（PP-g-AA）、衣康酸接枝聚丙烯 (PP-g-ITA)、马来酸酐接枝聚丙烯 (PP-g-MAH)3种相容剂增容聚丙烯（PP）/乙烯-乙烯醇共聚物(EVOH)共混体系,研究了共混体系的相容性、热性能、力学性能和阻隔性能。红外光谱分析表明,相容性的改善源于相容剂与EVOH之间形成的酯键和氢键。扫描电镜显示,PP-g-AA、PP-g-ITA、PP-g-MAH的增容作用依次增强,共混体系中相容剂增容作用越强,分散相尺寸越小,界面结合越牢固。差示扫描量热分析发现,PP/EVOH增容共混体系中EVOH组分的结晶温度低于不含相容剂的共混体系EVOH组分的结晶温度,PP组分的结晶温度变化则相反。增容共混体系与不含相容剂的共混体系相比,拉伸强度提高了10 MPa,吸油率降幅达0.8 %。     

Polyamide-6/Poly(lactic acid) Blends Compatibilized by the Maleic Anhydride Grafted Polyethylene-Octene Elastomer

To evaluate the feasibility of a strategy to partially replace polyamide-6 (PA6) with poly(lactic acid) (PLA), the morphology, mechanical, and thermal properties of PA6/PLA blending systems were investigated. Polyethylene-octene elastomer (POE) and POE grafted with maleic anhydride (POE-g-MAH) are added to improve the impact strength and elongation at break of the blend. The results show that POE-g-MAH is an effective compatibilizer for PA6/PLA blending system. Compared with the morphology of PA6/PLA/POE, smaller particle size, more homogeneous distribution of domains and improved interfacial adhesion between matrix and domains were observed in the PA6/PLA/POE-g-MAH blending system.     

聚丙烯接枝衣康酸增容PA6／PP共混物性能及形态研究

采用反应型双螺杆挤出机和熔融接枝技术制备了一系列聚丙烯（PP）接枝物，包括单一单体接枝物PP接枝衣康酸（PP-g-ITA）和双单体接枝物PP接枝ITA和苯乙烯[PP-g-（ITA-co-St）]，通过红外光谱和热分析研究了PP接枝物的结构，并研究了PP接枝物的接枝率和熔体流动速率与单体和引发剂用量的关系。通过反应挤出制备了PP接枝物增容PA6／PP共混物，研究了增容共混物的力学性能和形态结构。结果显示：加入接枝物后，共混体系的冲击强度明显提高；SEM观察表明，接枝物的加入能明显改善增容共混物的两相界面结合状况，降低共混物的分散相尺寸，改善体系的分散状况，共混物的两相界面变得模糊，相容性得到明显提高；DSC测试表明，加入接枝物后，共混物中PA6组分的结晶度下降，PP组合的结晶度上升。表明PP-g-ITA是PA6／PP共混体系有效的增容剂兼增韧剂。     

Phase Morphology and Miscibility of iPP/PcBR Blends

Isotactic polypropylene/poly(cis-butadiene) rubber (iPP/PcBR) blends were prepared by melt mixing. Phase morphology of the blends was investigated by scanning electronic microscopy (SEM). It was found that the dispersed phase spread in continuous phase in a form of spherical particles. The size of the dispersed phase increased as its content increased. The phase-inversion region was the composition of 50/50 and 40/60 vol% in the blends. In the phase-inversion region, a double continuous phase was formed. The glass transition temperatures (T _g ) of iPP, PcBR and blends were analyzed by dynamic mechanical analysis (DMA). The blend compositions exhibited two distinct glass transition temperatures corresponding to the iPP-rich and PcBR-rich phases, respectively. The approach of these two peaks with increasing PcBR content indicated partial miscibility between the iPP and PcBR, which was verified by the equilibrium melting point depression of blends.     

PP-g-GMA的制备及其增容PP/PA6共混物的性能

通过熔融接枝反应制备了甲基丙烯酸缩水甘油酯接枝聚丙烯（PP-g-GMA）,并将其作为聚丙烯/聚酰胺6（PP/PA6）共混物的相容剂,研究了PP-g-GMA对PP/PA6共混物的力学性能及形态结构的影响。结果表明,采用滴定法测得PP-g-GMA接枝率为3.35 %;当PP-g-GMA的添加量为4 %（质量分数,下同）和8 %时,PP/PA6/PP-g-GMA共混物的拉伸强度和缺口冲击强度分别较PP/PA6共混物提高了32.4 %和60.4 %;PP-g-GMA显著改善了PP/PA6 共混物的界面相容性,是PP/PA6共混物的有效增容剂。     

PP-g-MAH增容PP/PA-66共混物形态结构和性能

用固相接枝法制备了马来酸酐接枝改性聚丙烯(PP g MAH),研究了PP g MAH增容PP/PA 66共混物的形态结构和性能。结果表明,用PP g MAH增容的PP/PA 66共混物的拉伸强度提高约10MPa,弯曲强度、弯曲模量有所提高,缺口冲击强度和伸长率保持不变。     

Study of Compatibilized Liquid Crystalline Polymer/Cyclic Olefin Copolymer Blends

The technology to produce compatibilized blends of liquid crystalline polymer and highly amorphous cyclic olefin copolymers through two novel approaches were studied. The first approach was to use silane-functionalized halloysite nanotube as nonspecific compatibilizer and the second method was reactive compatibilization. The study of blends and their resulting microstructure; their thermal, mechanical, and viscoelastic properties were investigated. The kinetic study of blends compatibilized through both routes was performed.     

Non-Isothermal Crystallization of High-Impact Polystyrene/Poly(Phenylene Sulfide) Blends

The morphology of isothermally crystallized poly(phenylene sulfide) (PPS) and a blend combining it with high-impact polystyrene (HIPS) were observed through a polarized optical microscope equipped with a CSS450 hot-stage. The crystalline superstructure of PPS is mainly spherulite, and it was found that the presence of HIPS has little influence on the morphology of PPS, but decreases the nucleation rate of PPS. The effect of HIPS on the non-isothermal crystallization of PPS was investigated by differential scanning calorimetry (DSC). The maximum and onset crystallization temperatures for the HIPS/PPS blend were about 10°C lower than those of neat PPS, which indicates that the crystallization of PPS was retarded by HIPS. The Ozawa model was used to analyze the non-isothermal crystallization kinetics of PPS and its blends. The Avrami exponent values of neat PPS were higher than those of its blend, which shows that the presence of HIPS changed both the nucleation rate and the crystallization rate of PPS.     

增容PP/废弃PET织物纤维复合材料的结构与性能

用马来酸酐接枝聚丙烯(PP-g-MAH)、甲基丙烯酸甲酯和苯乙烯的混合物(MMA/St)两种相容剂对PP和废弃的PET织物(WF)复合材料界面进行改性,研究其力学性能、微观形态和热行为.结果表明:WF的加入使PP的拉伸强度下降,但改善了弯曲强度和模量,更使冲击强度大幅提升.在高WF填充量时,PP-g-MAH改性有助于改善弯曲性能和韧性,MMA/St混合物改性则对拉伸性能和弯曲性能更有利.挤出共混可使WF织物在PP中实现单纤维分散,PP-g-MAH和MMA/St改性改善了WF和PP的分散和界面粘结,MMA/St改性效果更优.这3类PP/WF复合材料的热稳定性都有所提高.     

PP／AS／DCP反应共混中SEBS的添加效应

研究了在聚丙烯（ＰＰ）／丙烯腈－苯乙烯共聚物（ＡＳ）／过氧化二异丙苯（ＤＣＰ）共混物反应挤出过程中添加热塑弹性体氢化（苯乙烯－丁二烯－苯乙烯共聚物）（ＳＥＢＳ）对ＰＰ／ＡＳ共混物降解的抑制效果对接枝反应的促进作用。对反应经物中ＰＰ相ＭＦＲ、红外测试及扫描电子显微镜与航向电子显微镜对共混物的观察结果表明,加入ＳＥＢＳ不但可以抑制反应共混中ＰＰ和ＡＳ的降解,而且可以大大促进反应共混中的接枝反应的进行,     

Enhancing the PLA Crystallization Rate and Mechanical Properties by Melt Blending with Poly(styrene-butadiene-styrene) Copolymer

Poly(styrene-butadiene-styrene) (SBS) copolymer was used to enhance the crystallization ability and mechanical properties of poly(L-lactic acid) (PLA) through melt mixing. The thermogravimetric analysis and Fourier transform infrared results revealed the n–π interaction between PLA and SBS. Differential scanning calorimetry and X-ray diffraction analysis indicated that the crystallization ability of the PLA improved substantially. The PLA crystallized completely during the cooling process when the SBS content in the blend was above 20 wt.%. The elongation at break and the impact resistance were significantly improved compared with that of neat PLA when the SBS content was above 50 wt.%.     

纳米CaCO_3和SBS增容PP/K树脂体系的研究

研究了纳米CaCO3和SBS分别添加和复配添加对PP/K树脂（70/30）共混体系相容性的影响。结果表明：纳米CaCO3的质量分数为5.7%时,体系的分散相尺寸降低,分布均匀性改善,有一定的增容效果;当其质量分数为9.1%时,体系的相容性保持不变;SBS的增容效果与纳米CaCO3的类似。纳米CaCO3和SBS先双辊混炼后再复配填充PP/K树脂（70/30）体系,其质量分数为9.1%时,改变纳米CaCO3/SBS的配比,体系的相容性变化不大;纳米CaCO3与SBS复配填充PP/K树脂（70/30）体系的缺口冲击强度比纳米CaCO3或SBS单独填充体系的都有明显提高,但拉伸强度变化不大。     

Morphology and Thermal Properties of Compatibilized PA12/PP Blends with Boehmite Alumina Nanofiller Inclusions

Boehmite alumina nanoparticles are added to PP‐g‐MAH‐compatibilized blends of PA 12 and PP to study the effects of nanoparticle loading in the resulting composites. WAXD and SEM data suggest that the nanoparticles enhanced the coalescence of PP. DSC, DMA, and TGA reveal that the final properties such as crystallization temperature, flexural storage modulus, thermal degradation temperature, etc., improve with increasing nanoparticle loading for blend/based composites. FTIR results show that the nanoparticles interfere with the interfacial activity at 5 wt% nanoparticle loading. All results are compared between the neat polymers and the compatibilized blend and show that despite a slight increase in dispersed‐phase domain size, all other properties improve with the addition of AlO(OH).