PP／EPDM／CaCO2三元共混体系的脆韧转变研究

采用扫描电镜和材料力学性能试验方法研究了ＰＰ／ＥＰＤＭ／ＣａＣＯ３三元体系中ＣａＣＯ３的表面处理与其材料的缺口冲击韧性及产生脆韧转变现象之间的关系。实验结果及分析表明，体系中分散相颗粒周围向ＰＰ基体扩散，渗透或与之共结晶的ＥＰＤＭ部分是增韧ＰＰ的有效成分；     

CaCO3刚性粒子增韧HDPE的脆韧转变研究

研究了ＨＤＰＥ／ＣａＣＯ３增充体系中ＣａＣＯ３表面处理，粒径，含量及其体树脂分子量，结晶性与其材料缺口冲击强度，产生脆韧转变现象及其体晶态结构间的关系。结果表明，该共混体系中界面应力的应变诱导致结晶作用及其所引起的基体中伸展链晶体络结构的形态是该材料实现脆韧转变的重要原因。     

聚苯醚与含有机硅嵌段共聚物共混的研究

利用差热扫描量热计（ＤＳＣ）、动态粘弹谱仪（ＤＤＶ）和力学性能测试等手段研究了ＰＰＯ／ＰＨＳ－ＰＤＭＳ、ＰＰＯ／ＰＰＯ－ＰＨＳ－ＰＤＭＳ和ＰＰＯ／ＰＳ／ＰＰＯ－ＰＨＳ－ＰＤＭＳ３个共混体系的形态结构和性能。结果表明，ＰＰＯ／ＰＨＳ－ＰＤＭＳ为一相容体系。当ＰＰＯ分子量与ＰＰＯ－ＰＨＳ－ＰＤＭＳ中ＰＰＯ分子量相同时，ＰＰＯ／ＰＰＯ－ＰＨＳ－ＰＤＭＳ与ＰＰＯ／ＰＳ／ＰＰＯ－ＰＨＳ－ＰＤＭＳ是两个相容体     

PPO作为PPO-PDMS-PHS_n/PS增容剂的研究

导了一种新的共混增容体系，以均聚物ＰＰＯ作为不相容共混体系ＰＰＯ－ＰＤＭＳ－ＰＨＳ／ＰＳ的增容剂。ＤＳＣ和ＤＭＡ的研究结果表明，ＰＰＯ对ＰＰＯ－ＰＤＭＳ－ＰＨＳ／ＰＳ共混体系确有增容作用，ＰＰＯ的含量在１３．５％以下时，ＰＳ、ＰＰＯ和ＰＰＯ－ＰＤＭＳ－ＰＨＳ中的硬段相容为一相；ＰＰＯ的含量在２３．８％以上时，ＰＰＯ分布在ＰＳ相和ＰＰＯ－ＰＤＭＳ－ＰＨＳ中的硬段相中，经ＰＰＯ增容后，材料的拉伸性能明显提高。     

PP三元共混合金的力学性能及结晶行为研究

研究了不同乙烯含量的ＥＰＤＭ对ＰＰ／ＵＨＭＷＰＥ合金的增容作用,并讨论了共混体系结晶行为的变化情况。发现ＥＰＤＭ中乙烯含量的增加可提高增容效果;在ＰＰ／ＵＨＭＷＰＥ／ＥＰＤＭ为１００／１０／６时,共混物缺口冲击强度可达９１．１ｋＪ／ｍ＾２,为ＰＰ的３．５倍,此时拉伸强度仍比纯ＰＰ高４．３ＭＰａ。     

HPVC/PP共混改性研究Ⅳ共混物的流变特性

研究了ＨＰＶＣ／ＰＰ共混物的流变性能，结果表明，ＣＰＥ、ＡＢＳ对ＨＰＶＣ／ＰＰ有增粘作用。随着ＣＰＥ用量增加，共混物熔体粘度（ηａ）增加。ＣＰＥ或ＡＢＳ先与ＨＰＶＣ共混后再与ＰＰ共混的共混物的ηａ高于ＣＰＥ或ＡＢＳ先与ＰＰ共混后再与ＨＰＶＣ共混的共混物的ηａ。ＨＰＶＣ／ＰＰ、ＨＰＶＣ／ＰＰ／ＭＡＨ２．５、ＨＰＶＣ／ＰＰ／ＣＰＥ１０、ＨＰＶＣ／ＰＰ／ＡＢＳ１０共混物的ηａ～组成（Ｃ）的关系均属于正－负偏离共混物（Ｐ－ＮＤＢ）体系，即在特定共混比下发生相转变。     

HDPE／改性剂／改性CaCO3填充体系结构与性能

为了进一步增强ＨＤＰＥ／ＣａＣＯ３填充复合体系的界面相互作用，在对ＣａＣＯ３表面改性的同时，还加入一种新型改性剂－马来酸酐改性的聚烯烃。对填充体系的结构，性能和相互作用进行了研究。结果表明，改性后的填充体系综合性能已大大超过本体，冲击强度与改性前相比提高了９倍多；ＳＥＭ及抽提实验表明，改性剂和改性填料之间存在明显的相互作用，且形成较牢固的键合：ＤＳＣ和ＷＡＸＤ显性改性剂对ＨＤＰＥ的结晶行为基本无影     

高分子复合型PIC材料稳定性的研究

研究了基体、工艺等影响高分子复合型ＰＴＣ材料稳定性的因素。通过共混等手段,对比了ＰＥ、ＬＬＤＰＥ、ＬＬＤＰＥ／ＰＰ及ＬＬＤＰＥ／硅烷等体系,得到了稳定性较好的基体材料。并通过扫描电镜（ＳＥＭ）观察了不同体系的试样断面的微观形貌。经过研究,认为将ＬＬＤＰＥ接枝硅烷或在ＬＬＤＰＥ中添加ＰＰ作为成核剂,可以改善基体树脂的结晶形态,加强晶区与非晶区之间的联系,在一定程度上提高材料的稳定性。     

PP/EPDM/DDCP共混体系的流变性能-亚微形态-力学性能研究

采用ＥＰＤＭ作为增韧剂，ＤＤＣＰ作为流动改性剂，通过双螺杆挤出机共混制成ＰＰ／ＥＰＤＭ／ＤＤＣＰ高分子合金，并测试其力学性能；研究其共混组成对流变性能的影响；用ＳＥＭ对所制备的合金的亚微形态进行了观察。结果表明，合金的缺口冲击强度和力学性能得到显著提高，其冲击样条断裂面上呈现明显韧性断裂特征；ＤＤＣＰ的加入明显地改善了流动性；填料可使合金的刚性得到加强。     

超高韧半晶聚合物PP多相体系的结构及脆韧转变的研究

通过严格控制工艺条件，得到了不同分散相含量和不同粒径的ＰＰ／ＥＰＤＭ／ＨＤＰＥ和ＰＰ／ＥＰＤＭ共混体。利用ＳＥＭ分析了ＰＰ／ＥＰＤＭ／ＨＤＰＥ的结构特点，通过测量Ｉｚｏｄ缺口冲击强度，得到了ＰＰ／ＥＰＤＭ／ＨＤＰＥ的脆韧转变主曲线，证明其符合脆韧性转变规律；同时利用ＳＥＭ照片，分析了主曲线不同区域的增韧机理。     

PP／EPDM共混物注射成型样条的断口形态和冲击性能

借助扫描电子显微镜观察了ＰＰ／ＥＰＤＭ共混物注射成型样条的冲击断口形态以及该共混物注射产条的芯－壳结构特征，研究了ＥＰＤＭ基体中的各向异性分布，不同冲击强度样品的断口形态以胶芯－壳结构和ＥＰＤＭ的各向异性分布对断口形态和冲击性能的影响。     

Highly toughened polypropylene/ethylene–propylene-diene monomer/zinc dimethacrylate ternary blends prepared via peroxide-induced dynamic vulcanization

Polypropylene (PP)/ethylene–propylene-diene monomer (EPDM)/zinc dimethacrylate (ZDMA) blends with remarkable toughness and extensibility were successfully prepared via peroxide dynamical vulcanization. A unique structure with the EPDM particles surrounded by a transition zone containing numerous polymerized ZDMA (PZDMA) nano-particles was observed for the first time by using transmission electron microscopy (TEM) examination, which contributed to the dramatically increase of Izod impact strength. Dynamic mechanical analysis (DMA) confirmed that the possible PZDMA graft products resulted from peroxide dynamical vulcanization improved the compatibility between EPDM and PP phases. The specific morphology of the PP/EPDM/ZDMA blends indicated that ZDMA can lead to size reduction and good distribution uniformity of the crosslinked rubber particles and the increase of adhesion between PP matrix and EPDM phases during deformation. The synergic effect of the increase in the effective volume of the EPDM phase, the improved compatibility and adhesion between EPDM and PP phases and the deformation of those fine rubber particles is believed to result in the remarkable high toughness and extensibility of the PP/EPDM/ZDMA blends. Particularly for the PP/EPDM ratio of 70/30, the PP/EPDM/ZDMA (70/30/9, w/w/w) ternary blends with the Izod impact strength nearly 2 times higher than PP/EPDM (70/30, w/w) binary blends and 15–20 times higher than PP are achieved; besides, the elongation at break of PP/EPDM/ZDMA ternary blends is 4–5 times higher than that of PP/EPDM binary blends.     

DCP用量对PP／EPDM共混物性能和形态的影响

用动态硫化法制备的PP／EPDM共混型热塑性弹性体的性能明显优于直接共混型PP／EPDM热塑性弹性体,这是由于模量低的EPDM柔性长链经化学交联后,强化对PP的增韧效果,而交联后又被扯断细化的EPDM的颗粒,改变了因EPDM相互缠结所导致的熔融粘度大,加工性能差的缺陷。制备PP／EPDM热塑性弹性体的关键是动态硫化,由于PP／EPDM共混物的动态硫化是一个融物理共混、化学引发交联和剪切细化分散为一体的复杂过程,材料的性能除决定于组成、组分性能和化学交联体系外,还强烈依赖于所采用的共混工艺方式及其条件。本章采用过氧化二异丙苯（DCP）作为硫化剂,研究了过氧化物用量对动态硫化PP（K8303）／EPDM共混物性能和形态的影响。     

Effect of high density polyethylene addition and testing temperature on the mechanical and morphological properties of polypropylene/ethylene-propylene diene terpolymer binary blends

High density polyethylene (HDPE) was added to the polypropylene (PP)/ethylene-propylene diene terpolymer (EPDM) binary blend, and the effect of testing temperatures on the modulus of elasticity, impact behavior and corresponding fracture morphology was analyzed. Modulus of elasticity generally decreased as the EPDM content increased regardless of the testing temperatures. However, it was found that the modulus of elasticity of PP/EPDM/HDPE ternary blend increased compared to PP/EPDM binary blend when tested at –30 and –60 °C. Notched Izod impact strength changed depending on the testing temperatures, however, there was not much difference between binary and ternary blends up to 20 wt% EPDM. However, at more than 30 wt% EPDM content, ternary blends showed higher impact strength compared to binary blends. Especially, at –30 °C, brittle-ductile transition was observed between 20 and 30 wt% EPDM. Subsurface morphology was also analyzed, and the relationship between the impact strength and the stress whitening zone was investigated. Scanning electron microscopy observation of impact fractured surfaces was conducted, and overall morphology was analyzed with respect to HDPE addition and testing temperature change.     

采用β成核动态硫化PP/EPDM共混物增韧聚丙烯

采用β成核的动态硫化iPP/EPDM共混物即热塑性硫化胶(TPV)改性聚丙烯,并与通用增韧剂聚烯烃弹性体(POE)、三元乙丙橡胶(EPDM)增韧聚丙烯进行比较,考察了增韧体系的力学性能、热性能和相形态.结果表明,随增韧剂含量的增加,增韧体系的拉伸屈服强度和弯曲模量均有所下降,而冲击强度提高.TPV改性体系的强度、模量和...     

EPDM动态硫化增韧PP的性能和形态研究

采用羟甲基叔丁基酚醛树脂及２,５－二甲基－２,５－二叔丁基过氧基己烷／硫黄作交联剂,研究了三元乙丙橡胶动态硫化对增韧聚丙烯性能的影响。实验证实,随酚醛树脂用量增加共混物的抗冲韧性显著提高,但流动性明显下降。过氧化物既能有效硫化橡胶,又能使聚丙和解,从而得到高韧性和高流动性的共混物。扫描电镜分析表明,交联剂用量增加,共混物中橡胶相粒径显著减小,这归因于橡胶相的交联和在橡界面形成接枝或嵌段共聚物。     

Mechanical, Thermal, Morphological and Rheological Properties of Polypropylene/Ultrahigh Molecular Weight Polyethylene Blends

In this study, the blends of polypropylene (PP) and ultrahigh molecular weight polyethylene (UHMWPE) were prepared by the four-and twin-screw extruders, and ethylene-propylene-diene monomer (EPDM), as the third component, was added to the binary blends. The mechanical.thermal, morphological and rheological properties of these two blends have been investigated.For the materials blended by the four-screw extruder, a 15 wt-% content of UHMWPE corresponds to a maximum lzod impact strength, and the miscibility enhancement effect of EPDM on PP/UHMWPE blends is very remarkable. Mechanical and thermal properties demonstrate that melt blending by the four-screw extruder is a better prcessing method for PP/UHMWPF blends than that by the twin-screw extruder. A co-continuous structure was observed in blends through TEM, and a novel "linear interpenetrating" toughening mechanism is proposed on the basis of this research work     

三螺杆动态混炼挤出EPDM/PP共混物拉伸强度的研究

在三螺杆动态混炼挤出机上,研究了不同橡塑比的(三元乙丙橡胶)EPDM/(聚丙烯)PP共混物经动态混炼和稳态混炼挤出后的拉伸性能.振动频率和振幅对共混物的拉伸强度均有很好的强化作用,并分析了振动力场对EPDM/PP共混物影响的规律和振动强化效果.     

Effect of crosslinking on morphology and phase inversion of EPDM/PP blends

This study investigates the effect of cross-linking on morphology and phase inversion of EPDM/PP blends. Several EPDM/PP blends without and with cross-linking agent were prepared in a Haake batch mixer under constant conditions. The morphology was studied by electronic microscopy (SEM and TEM), and cross-linking was followed by EPDM gel content and swelling. The results showed that the position of the phase inversion region is essentially governed by composition, being independent of the viscosity ratio of the EPDM/PP blend. The TPVs’ morphology of the EPDM/PP blend, with 70 and 50 wt% of PP, consists of EPDM cross-linked particles dispersed in the PP matrix. For EPDM-rich composition (30 wt% of PP), the TPVs’ morphology appears to be co-continuous. Even though dynamic vulcanisation of the rubber phase always improves the dispersion of the EPDM phase, complete phase inversion (from fully dispersed PP in the EPDM matrix to EPDM fully dispersed in the PP matrix) was achieved only with low viscosity EPDM.