VC／BA共混物增容PVC／HDPE共混体系的研究

采用氯乙烯—丙烯酸丁酯(VC/BA)共混物作为聚氯乙烯(PVC)/高密度聚乙烯(HDPE)共混物的增容剂,通过冲击实验、拉仲实验、动态力学分析,系统地研究了共混体系性能与其结构之间的关系。通过Brabender流变仪测定了VC/BA共混物增容PVC/HDPE共混体系的流变性能。结果表明,VC/BA共混物是PVC/HDPE共混体系的良好增容剂。在一定范围内,VC/BA共混物与HDPE对PVC有协同增韧效应。vC/BA和HDPE的加入改善了PVC的塑化和流变性能     

ABS/(VC-BA)/PVC共混体系的研究

介绍了丙烯腈-丁二烯-苯乙烯三元共聚物／聚氯乙烯(ABS／PVC)共混体系中添加氯乙烯-丙烯酸丁酯二元共聚物(VC-BA)树脂，进行三元共混改性的研究，找出了能使共混物综合性能较佳的三元共混物的配方。试验证明，通过添加VC-BA树脂，可改进ABS／PVC共混物的性能，有利于该共混物进一步降低价格，扩大应用。此外，对该共混物中，最适宜于PVC改性用的ABS品种，也进行了选择性的探讨。     

HDPE/PC/EVA共混体系的性能研究

研究了乙烯-醋酸乙烯共聚物(EVA)增容高密度聚乙烯(HDPE)和聚碳酸酯(PC)共混体系，讨论了EVA，PC对HDPE／PC共混合金性能的影响。结果表明：随PC用量的增加，HDPE／PC共混合金的熔体流动速率减小，缺口冲击强度增大，拉伸强度增大，维卡软化点变化不大。EVA能够改善合金体系的加工流动性，却明显降低了合金体系的力学性能。     

高能辐射对HDPE/PS/PVC共混体系的增容增韧作用

适用于二元体系的增容剂EVA和SEBS对三元体系的增容、增韧作用不明显，对HDPE/PS/PVC共混体系进行γ-射线辐射，使得体系相容性提高，抗冲击性能显著提高，断裂伸长率略有下降。照射产生的相互交联是增容、增韧的主因。     

PET与HDPE的共混物研究

对聚对苯二甲酸乙二醇酯(PET)与高密度聚乙烯(HDPE)共混物近十几年来的研究进展进行了综述.PET与HDPE为不相容共混物,加入增容剂后,不仅增加了体系的相容性,而且改善了体系的性能.本文介绍了PET/HDPE共混体系的增容剂和性能.     

HDPE/硫化胶粉共混材料的研究

研究了HDPE／硫化胶粉共混材料的力学性能和流动性能。结果表明,硫化胶粉与HDPE有良好的混合性能,共混材料的冲击性能化胶粉含量增加而提高,但共混材料的拉伸强度和流动性能有所下降。添加5％的PE－g－MAH进行增容,可使共混材料的力学性能明显提高。     

CHR/PVC共混增容研究

以聚2－乙烯基吡啶和聚环氧乙烷多嵌段共聚物（P2VP－b－PEO）为增容剂，研究了氯醚橡胶（CHR)和聚氯乙烯（PVC）之间的共混，考察了增容剂用量、PVC／CHR配比、增容剂组成、增容剂中P2VP链段长度对共混物机械性能的影响。发现2％－3％的多嵌段共聚物能够很好地增容CHR／PVC共混体系，多嵌段共聚物中PEO链段含量越高、P2VP链段越长，增容效果越好。     

增容剂对HDPE/PC共混体系性能的影响

系统研究了增容剂（LDPE-g-DABPA)对高密度聚乙烯（HDPE）／聚碳酸酯（PC）共混体系形态及拉伸性能、冲击性能、热性能、流动性能的影响，确定了增容剂的最佳用量。结果表明，在HDPE／PC／LDPE-g-DABPA为85／15／16时，体系拉伸强度没有变化，而冲击强度由未增容的13．86kJ/m增加到55．31kJ/m，提高了3倍，MFR由1．65g/10min增加到2．16g/10min，用裂纹扩展功（G1c)评价LDPE-g-DABPA的增容效果，结果表明，体系的G1c由增容前的0．0955J增加到0．2025J，说明LDPE-g-DABPA有良好的增容作用。     

ABS／PVC共混改性的研究

考察了PVC含量对ABS/PVC共混体系性能的影响。为了进一步提高共混体系的性能，在体系中分别加入CPE、MBS做为第三组分。通过性能比较，发现MBS可有效提高共混体系的综合性能。为了增加共混体系的阻燃性能，加入助阻燃剂Sb2O3，结果表明共混体系的阻燃性能有了很大提高。     

增容剂对CL/HDPE共混材料界面相容性的影响

为充分利用木质素可再生资源,以木质素磺酸钙(CL)和高密度聚乙烯(HDPE)为原料,通过挤出成型法制备了CL/HDPE共混材料.通过扫描电子显徵镜(SEM)、示差扫描量热仪(DSC)、热重分析仪(TG)、万能力学试验机、动态机械分析仪(DMA)等多种表征手段,系统研究了马来酸酐接枝聚乙烯(MAH-g-PE)、乙烯-醋酸...     

VC-BA树脂替代ACR对PVC性能的影响

研究了VC—BA树脂（即氯乙烯一丙烯酸丁酯共聚树脂）与ACR对PVC干混料的加工性能、试样的力学性能的影响。结果表明：VC—BA树脂与PVC相容性良好。它的加入促进了PVC体系的熔融,改善了干混料的塑化性能,提高了试样的力学性能,可以替代ACR,是性能良好的PVC改性剂。     

NBR/PVC共混胶的结构与性能

采用机械共混法和乳液共沉法制备了NBR/PVC共混胶,通过差示扫描量热仪(DSC)和场发射扫描电子显微镜(FE-SEM)对共混胶的微观形貌、结构进行了表征,考察了共混方式和共混胶配比对其力学性能的影响,并比较了共混胶、CPE、P-83对硬质/软质PVC的改性效果。结果表明:①与机械共混胶相比,乳液共沉胶混合得更均匀,分散性更好,其分子级混合程度更好;②乳液共沉胶试样的力学性能在总体上优于机械共混胶;③对于硬质PVC,CPE的改性效果优于其他改性剂;④对于软质PVC,乳液共沉胶的改性效果最好,特别是对撕裂强度的提高非常明显。     

PVC/TPU/NBR三元共混物的制备及性能研究

对PVC／热塑性聚氨酯（TPU）／SR三元共混物的性能进行研究，重点讨论NBR品种、TPU／NBR并用比、PVC聚合度、增塑剂DOP和硫化剂DCP用量对PVC／TPU／NBR三元共混物性能的影响。结果表明。PVC／TPU／NBR-3604三元共混物的物理性能较优；PVC／TPU／NBR-3604三元共混物的拉断伸长率和拉断永久变形均随着PVC聚合度的增大基本呈上升趋势；随着增塑剂DOP用量的增大，共混物的邵尔A型硬度、拉伸强度、撕裂强度和拉断永久变形均基本呈下降趋势，拉断伸长率增大；随着硫化剂DCP用量的增大。共混物的拉伸强度和拉断伸长率变化不大，撕裂强度基本呈逐渐减小的趋势。不同PVC／TPU／SR三元共混物的扫描电子显微镜照片表明，NBR与PVC和TPU的相容性较好。     

VC-BA/纳米CaCO3复合母粒增韧PVC

采用氯乙烯-丙烯酸丁酯共聚弹性体(VC-BA)和经表面处理的纳米碳酸钙(nano-CaCO_3)制备VC- BA/nano-CaCO_3复合母粒,再用该复合母粒与聚氯乙烯(PVC)共混,制备了VC-BA/nano-CaCO_3复合母粒增韧的PVC复合材料。复合母粒中m(VC-BA)/m(nano-CaCO_3)为2:3时,增韧效果最佳。nano-CaCO_3与VC-BA有协同增韧作用,且nano-CaCO_3能够补强。当PVC和复合母粒质量比为100:20时,材料的冲击强度达到49.5 kJ/m~2,是纯PVC的10倍,拉伸强度为51.0 MPa。     

Radiation effects on HDPE/EVA blends

In this article, we discuss the radiation effects of high‐density polyethylene (HDPE)/ethylene–vinyl acetate (EVA) copolymer blends. In comparison with the low‐density polyethylene/EVA blends, the EVA content in the HDPE/EVA blends had a lower enhancement effect on radiation crosslinking by γ‐ray irradiation in air. The phenomenon is discussed with the compatibility, morphology, and thermal properties of HDPE/EVA blends. The HDPE/EVA blends were partly compatible in the amorphous region, and radiation crosslinking of the HDPE/EVA blend was less significant, although increasing the amorphous region's content of the HDPE/EVA blends and the vinyl acetate content of EVA were beneficial to radiation crosslinking. The good compatibility was a prerequisite for the enhancement effect of EVA on the radiation crosslinking of the polyethylene/EVA copolymer. The radiation crosslinking and the degradation mechanism of HDPE/EVA blends were examined quantitatively by a novel method, the step analysis process of irradiated HDPE/EVA blends with a thermal gravimetric analysis technique. © 2002 Wiley Periodicals, Inc. J Appl Polym Sci 86: 553–558, 2002     

Preparation and properties of compatibilized PVC/SMA‐g‐PA6 blends

The morphology and mechanical properties of PVC/SMA‐g‐PA6 blends were investigated in this paper. Graft to polymer SMA‐g‐PA6 was prepared via a solution graft reaction between SMA and PA6. FTIR test evidences the occurrence of the graft reaction between SMA and PA6. DSC analysis shows that SMA‐g‐PA6 has a lower melting point of 187°C, which may result in a decrease in crystallinity of PA6 and thus enable efficient blending of SMA‐g‐PA6 and PVC. Compatibilization was evidenced by the dramatic increase in mechanical properties, the smaller particle size and finer dispersion of PA6 in PVC matrix, and, further, a cocontinuous morphology at 16 wt % SMA‐g‐PA6 content. SMA‐g‐PA6 from the solution graft reaction can toughen and reinforce PVC material. © 2004 Wiley Periodicals, Inc. J Appl Polym Sci 94: 432–439, 2004     

PVC/NBR共混物的耐油性研究

考察了PVC树脂聚合度、NBR用量及混料时加料顺序对PVC/NBR共混物耐油性的影响。结果表明:使用高聚合度PVC树脂和NBR P83可明显改善共混物的耐油性。试验初步确定PVC/NBR输油管实验配方为:PVC(S-2500)100份,稳定剂1份,DOP 100份,NBR P83 20份,润滑剂0.5份。     

CPVC/PVC/ACR 三元共混材料的研究

研究了CPVC／PVC／ACR三元共混材料的物理力学性能。结果表明，共混材料的维卡软化温度和拉伸屈服强度随CPVC用量的增加而增加；当ACR用量为6～8份时，可明显改善共混材料的冲击性能。     

Preparation of HDPE/UHMWPE/MMWPE blends by two-step processing way and properties of blown films

Summary Blends of high density polyethylene (HDPE) and ultra high molecular weight polyethylene (UHMWPE) were prepared by two-step processing way. Middle molecular weight polyethylene (MMWPE) as a fluidity modifier and compatilizer was added into UHMWPE in the first step, and then modified UHMWPE and HDPE were blending extruded to prepare the HDPE/UHMWPE/MMWPE blends used for blown films. The mechanical test of the blown films revealed that when the content of MMWPE in modified UHMWPE was 40wt% and the content of UHMWPE in the blends was 20 wt%, the film had the optimal mechanical properties. The tensile strength and tear strength of the film increased by 50% and 21%, respectively, compared with those of pure HDPE film. Rheological curves indicated that the melt torque and the apparent viscosity of the HDPE/UHMWPE/MMWPE blends made by two-step processing way both greatly reduced than other blends. The results from DSC suggested that the blends by two-step processing way may form more stable and perfect co-crystallization. PLM (polarized light microscopy) and SEM micrographs revealed that two-step processing way can improve the surface morphology of the films and make the dispersion of UHMWPE particles in HDPE increase.     

Mechanical properties of recycled PVC blends with styrenic polymers

The aim of this study is to improve the performance of blends made from recycled polyvinyl chloride (PVC), coming from credit card waste, so that these blends can be used for those applications that must fulfil some requirements with regard to mechanical properties and stability with temperature alterations. With this aim in mind, two polymers of styrenic origin have been combined: styrene acrylonitrile (SAN) and acrylonitrile butadiene styrene (ABS). These polymers are characterized by a satisfactory balance of mechanical properties and thermal stability. PVC blends with both virgin and recycled styrenic polymers have been studied throughout the entire range of compositions. The prior degradation of the recycled materials has been studied by means of Fourier transformed infrared spectroscopy (FTIR).The behavior of the observed T_g values has been analyzed using differential scanning calorimetry (DSC), and the existence of partial miscibility between the different components has been studied. The mechanical properties have been determined using tensile and Charpy impact tests. The thermal stability of the PVC blends with temperature changes has been determined using the Vicat softening temperature (VST). Finally, the fracture surface of the various blends has been analyzed using scanning electron microscopy (SEM). © 2006 Wiley Periodicals, Inc. J Appl Polym Sci 101: 2464–2471, 2006