在PS/PP合金的共混过程中分散相粒径的变化

采用间隙取样法，用扫描电子电镜观测聚苯乙烯／聚丙烯合金的相分布，求出分散相的粒径，研究了熔融共混过程中分散相粒径的变化规律，结果表明，分散相粒径随着体系内分散相含量的增加而增大。粒径冰仅受剪切速率大小的影响，还受分散相和连续相动态弹性模量的制约；在共混过程中，分散相粒子大小的变化主要发生在共混的初期，在共混的后期粒径趋于稳定。     

振动共混对聚丙烯/聚碳酸酯流变性能的影响

在传统转矩流变仪上叠加机械振动制成了振动共混流变仪。实验证明，振动共混降低了70／30聚碳酸酯／聚丙烯共混物的粘度和储存模量，随着制备时的振动振幅和频率的提高，这种效果更加突出。但过大振幅振动中，低剪切与高剪切间的频繁更换，特别是明显的低剪切下相翻转转慢，导致形成了部分不稳定“双连续”相态，这时共混物粘度和模量反而比小振幅振动下制备的共混物的高。一个描述该体系表面张力／液滴半径之比与剪切速率关系的经验表达式较好地分析了流变参数与微观相形态之间的关系，说明了振动促使分散相粒子的破碎和两相的分散，确实影响共混物的相形态。振动共混对聚丙烯／聚碳酸酯流变性能的影响上海交通大学化学化工学院高分子材料研究所，上海　200240振动共混　聚丙烯　聚碳酸酯　流变性能　影响　转矩共混流变仪　相形态在传统转矩流变仪上叠加机械振动制成了振动共混流变仪。实验证明，振动共混降低了70／30聚碳酸酯／聚丙烯共混物的粘度和储存模量，随着制备时的振动振幅和频率的提高，这种效果更加突出。但过大振幅振动中，低剪切与高剪切间的频繁更换，特别是明显的低剪切下相翻转转慢，导致形成了部分不稳定“双连续”相态，这时共混物粘度和模量反而比小振幅振动下制备的共混物的高。一个描述该体系表面张力／液滴半径之比与剪切速率关系的经验表达式较好地分析了流变参数与微观相形态之间的关系，说明了振动促使分散相粒子的破碎和两相的分散，确实影响共混物的相形态。     

PP/PS共混体系在挤出成型中的迁移行为

用傅立叶变换红外光谱(FT-IR)作为定量表征方法，研究了聚丙烯(PP)与聚苯乙烯(PS)共混物在挤出成型中的迁移行为。结果表明，不相容聚合物共混体系PP与PS熔体在挤出口模中流动时会由于剪切产生迁移，形成了粘度较高组分PP的浓度从中心到表层逐渐减小的梯度结构，并且PP的分布近似服从二次分布。     

PP/LLDPE共混体系的相容性及结晶行为

运用差示扫描量热法(DSC)研究了聚丙烯(PP)／线性低密度聚乙烯(LLDPE)共混物的相容性和结晶行为。实验结果表明,PP／LLDPE共混物为典型的具有机械相容性的共混体系;PP／LLDPE共混体系中,PP相结晶度的变化与LLDPE相的结晶度的变化相比较小;不论PP还是LLDPE,均随另一组分含量的增加,熔化开始温度都显著推迟,而熔化结束温度几乎不变．     

胍基聚电解质与聚丙烯共混体系的流变性能研究(I)PHGC/PP

以毛细管流变仪研究了不同组成的PHGC／PC共混体系的熔体流变行为,分别讨论了熔体粘度与温度、共聚体系组成之间的关系,并在电镜下观察了共混体系的相态结构,分析了共混体系的相容性对熔体流变行为的影响。结果表明,在实验条件下,PHGC／PP共混体系为切力变稀型流体;PHGC与PP相容性较差,在PP中分散颗粒较大;PHGC含量较低时,熔体粘度有极小值,随着温度和剪切速率的变化,熔体粘度随HGC含量的变化呈现出不同的变化趋势。在PHGC含量为2．5％时,非牛顿指数最大,粘流活化能最小。     

聚丙烯共混体系的可漆性研究

用功能化聚丙烯对聚丙烯(PP)共混体系进行改性,探讨了几种功能化聚丙烯对共混体系附着力性能的影响,结果表明,用功能化聚丙烯MP3使共混体系的可漆性最好。     

聚丙烯/弹性体共混体系流痕的形成机理及调控

利用扫描电子显微镜、衰减全反射傅里叶变换红外光谱仪和高温凝胶色谱仪研究了聚丙烯的相对分子质量及其分布、弹性体种类对聚丙烯/弹性体共混体系注塑样品流痕及流痕区结构形貌的影响。结果表明,弹性体的加入使聚丙烯缺口冲击韧性大幅提高,但聚丙烯和弹性体的微相相容性及熔体流动剪切诱导分相导致了注塑流痕的产生。茂金属催化丙烯基弹性体同聚丙烯具有更好的微相相容性;宽峰分布聚丙烯中低相对分子质量聚丙烯能提高共混体系的流动性,有利于橡胶相的解缠结和分散,能够稳定熔体的流动,避免基体与弹性体在剪切流动中发生相分离,从而有助于消除注塑流痕。     

胍基聚电解质与聚丙烯共混体系的流变性能研究(Ⅱ)PHGS/PP

以毛细管流变仪研究了不同组成的PHGS/PP共混体系的熔体流变行为，分别讨论了熔体粘度与温度、共混体系组成之间的关系，并在电镜下观察下共混体系的相态结构，分析了共混体系的相容性对熔体流变行为的影响。结果表明，在实际条件下，PHGS/PP共混体系为切力变稀型流体；PHGS以细小均匀的颗粒分散在PP中，PHGS/PP共混体系，在高剪切速率区，随着PHGS含量的增加，熔体粘度减小，在低剪切速率区，PHGS含量为2.5%时，熔体粘度有极大值，非牛顿指数在PHGS含量为2.5%时有极小值，而在含量为5.0%时有极大值，粘流活化能在PHGS含量为2.5%时最大。     

聚合物共混技术制备酚醛基纳米碳纤维

以聚丙烯（PP）为热解高聚物、酚醛树脂（PF）为碳纤维前躯体进行共混，采用熔融纺丝法将共混体系纺丝，对得到的纤维拉伸之后碳化去除去聚丙烯，得到酚醛基纳米碳纤维。采用红外光谱、扫描电镜等对PP／PF共混体系的相容性及微观结构进行分析，研究了纺丝牵伸比、降温母粒含量对纳米碳纤维形态的影响；用x射线衍射技术对纳米碳纤维的微晶结构进行研究。结果表明：随着降温母粒加入量的增加，酚醛树脂的分散尺寸增大；随着牵伸比的增加，纳米碳纤维的直径减小。XRD测试分析发现PP／PF共混纤维600℃碳化处理后已经开始产生一些石墨微晶，随碳化温度的升高，微晶长大，碳结构开始更趋规整、有序。     

聚丙烯／丙烯—辛烯共聚物共混体系的研究

利用扫描电镜、差热扫描量热计和动态粘弹谱仪等手段研究了聚丙烯／丙烯－辛烯共聚物共混体系的相容性及结晶和转变性能等。研究结果表明，该共混体系是完全相容的体系，该共混物的低温韧性优于聚丙烯。     

胶原/甘油共混溶液的流变性能

采用旋转流变仪和动态流变仪研究胶原/甘油共混溶液的稳态和动态流变性能,考查温度、剪切速率和胶原浓度对流动曲线的影响.结果表明,胶原/甘油共混溶液是假塑性流体,非牛顿指数,n随着甘油浓度的增加而减小,甘油的存在降低了共混溶液对温度依赖性,具体表现为:共混溶液n值的变化范围明显减小,流动曲线稳定.提高剪切速率比升高温度更能有效改善胶原/甘油共混溶液的流动性.体系中胶原浓度的改变,对共混溶液的粘弹性影响较大.     

高聚物共混物及嵌段共聚物熔体的流变性（Ⅰ）共混物熔体的流动特性

综述了高聚物二元共混物及嵌段共聚物熔体的静态流变性，分析了不同共混体系的流动曲线，总结了共混物的流动特性及规律     

PP/POE共混物的毛细管和转矩流变行为

利用高压双管毛细管流变仪和Haake转矩流变仪研究了聚丙烯(PP)/乙烯-辛烯共聚物(POE)体系的流变行为,探讨了转速、剪切速率、温度及共混物的组成对熔体流变行为的影响。结果表明,两种方法所测得的熔体流变学结果基本一致,共混物熔体表现为假塑性流变行为。随着POE含量的增加,PP/POE共混物熔体的表观黏度和非牛顿指数表现为负偏差行为,粘流活化能则表现出正负偏差行为,说明PP与POE之间存在一定的相容性。     

Organoclay-modified thermotropic liquid crystalline polymers as viscosity reduction agents for high molecular mass polyethylene

Small amounts of organoclays of different sizes and concentrations were added into thermotropic liquid crystalline polymer (TLCP) forming four types of organoclay-modified TLCPs (TC3 white, TC3 dark, TC3 FS, and TC3 UP), which had different rheological behaviors in the nematic temperature region of TLCP. Acting as viscosity reduction agents, 1.0 wt% of each organoclay-modified TLCPs were blended with high molecular mass polyethylene (HMMPE), respectively. The organoclay-modified TLCP/HMMPE blends displayed different rheological properties from each other or compared with HMMPE and 1.0 wt% TLCP/HMMPE blend [PT1]. The organoclay-modified TLCPs had greater viscosity reduction efficiency than the original TLCP in HMMPE, a lower yielding stress and yielding start shear rate, and a narrower yielding transition region than those of PT1. The rheological performance of the blends, 1.0 wt% TC3 white/HMMPE, 1.0 wt% TC3 FS/HMMPE, and PT1, could be successfully described by a binary flow pattern model.     

PMMA、SAN改性PVC/CPE共混体的研究

研究了刚性聚合物(PMMA、SAN)对PVC/CPE共混体力学性能、冲击断面形貌及流变性的影响。结果表明,PMMA对PVC/CPE=100/10、100/15体系,SAN对PVC/CPE=100/10体系都具有显著的增韧作用和一定的增强作用;初步的测定显示,刚性聚合物能改善共混熔体的流变性,促进PVC/CPE共混体系中CPE网络结构的形成和分散性。     

AS/ABS/CPE共混体系的力学性能和断裂形态

用流变方法研究了ABS树脂与氯化聚乙烯(CPE)的相容性。通过力学性能的测试和电镜观察研究了AS／ABS／CPE共混体系力学性能与组成、工艺、形态结构的关系。结果表明，在AS／CPE共混体系中加入ABS后，改善了AS与CPE的相容性，使该共混体系的力学性能有明显的提高。     

Grafting effects of polypropylene/polyethylene blends with maleic anhydride on the properties of the resulting wood-plastic composites

In the presented study, polypropylene (PP) and high density polyethylene (PE) were blended at the ratios of 80/20 and 20/80 to simulate recycled waste thermoplastic mixtures. The effects of in situ grafting of PP/PE blends with maleic anhydride through the extruder on the mechanical and rheological properties of resulting wood/plastic composites were investigated. Different ratios of PP and PE in the blends created distinct properties in the resulting composites. Grafting of PP and PE blends improved the tensile and flexure properties of the resulting composites. The composites exhibited a reduced water uptake and resultant dimensional swelling due to grafting with maleic anhydride. Grafting of the blends also considerably improved the interfacial bonding and enhanced the dispersion of wood in the matrix, as evidenced by rheological analysis and scanning electron microscopy.     

HDPE／NBR共混体系熔体流变特性的研究

本文用Instron毛细管流变仪研究了HDPE/NBR共混体系的流动曲线、表观粘度、以及HDPE/NBR共混体系的流变特性的本质。NBR的不完全交联被认为是产生HDPE/NBR共混体系流变特性的原因。     

Phase Behavior,Thermal Stability and Rheological Properties of PPEK／PC Blends

Phase behavior,thermal stability and rheological properties of the blends of poly(phthalazinone ether ketone)(PPEK) with bisphenol-A polycarbonate(PC) prepared by solution coprecipitation were studied using differential scanning calormetry(DSC),Frourier-Transfrom IR spectroscopy(FT-IR),thermogravimetric analysis(TGA) and capillary theometer. The DSC results indicated that PPEK/PC blends are almost immiscible in full compositions.FT-IR investigation showed that were no apparent specific interactions between the constituent polymers.The blends keep excellent thermal stability and the addition of PC degrades the thermal stability of blends to some degree.The thermal degradation processes of the blends are much similar to that of PC.The studies on rheological properties of blends show that blending PPEK with PC is beneficial to reducing the melt viscosity and improving the appearance of PPEK.     

Effect of blend composition on the rheology property of polypropylene/poly (ethylene-1-octene) blends

In the present study, the dynamic viscoelastic properties for binary blends consisting of polypropylene (PP) and poly (ethylene-1-octene) (POE) were investigated using a Stresstech Rheometer in molten states at 210 °C. The results show that the blends with different content of POE present diversified rheological behaviors. Meanwhile, the blends with 10 wt% and 20 wt% POE show especial rheological behaviors. The dynamic complex viscosity of the blends with 10 wt% and 20 wt% POE are higher than that of others. The storage modulus and loss modulus of the blends with 10–40 wt% POE are different from other blends, and the blends with 10 wt% POE present the largest relaxation time. This behavior is probably related to the miscibility and long chain branch of POE in the PP/POE blends.