硬聚氯乙烯共混改性的研究

本文研究了PVC／Elvaloy741、PVC／NBR和PVC／Elvaloy741／NBR三种共混体系。以不同配比的共混物的物理机械性能进行了测试。着重分析读者讨论了Elvaloy741和NBR对硬聚氯乙烯的增韧效果和机理。得到了综合性能良好的聚氯乙烯共混物料。     

PVC/Elvaloy/NBR三元共混热塑弹性体的研究

本文研究了PVC/Elvaloy 741/NBR三元共混体系,并与PVC/Elvaloy741和PVC/NBR二元共混物共行了比较。发现PVC/Elvaloy741/NBR三元共混物在拉伸强度方面有着明显的协同作用。另外,对工艺条件与共混物性能的关系进行了初步探讨。     

SBS及Elvaloy741用于PVC共混改性体系的研究

研究了PVC/SBS/Elvaloy741(Elvaloy 741为乙烯-醋酸乙烯酯-一氧化碳的三元共聚物)、PVC/SBS和PVC/Elvaloy 741共混体系。对不同配比的共混物的物理机械性能进行了测试,分析讨论了弹性体SBS、Elvaloy 741和SBS/Elvaloy741对PVC的增韧效果和机理。     

不同改性剂对PVC弹性体性能影响的研究

本文论述了以 PVC 为主体的廉价弹性体的性能,研究了 CPE、NBR、CR、ELVALOY—741、P_(83)等改性剂与 PVC 组成二元共混物的物理机械性能及其流动性,在此基础上,进一步研究了 CPE、NBR、PVC 三元共混物的物理机械性能,最后,用KMnO_4染色法研究了这些共混物的微观结构,并用 DSC 研究了其共混效果,这为进一步寻求高效低成本的弹性体提供了一些依据。     

Elvaloy741的辐射交联行为

采用电子加速器作为辐射源,研究Elvaloy 741在不同吸收剂量及交联敏化剂作用下的辐射交联行为,考察辐射对PVC共混物力学性能的影响.研究表明:Elvaloy 741是辐射交联的聚合物,添加3份TMPTA对Elvaloy 741有较好的交联敏化作用;Elvaloy 741的凝胶含量为60%～70%时,同时具有较好的拉伸强度和断裂伸长率;在不添加交联敏化剂的情况下,PVC/Elvaloy 741共混物经高能电子束辐射作用后,力学性能得到提高.     

PVC／Elvaloy741／MBS及PVC／Elvaloy741／MBS／CaCO3共混填充体系的研究

研究了PVC／Elvaloy741/MBS及PVC／Elvaloy741/MBS/CaCO3共混填充新体系,对其物理机械性能的测试结果进行了讨论。结果表明：当PVC为100份、Elvaloy741为6份、MBS用量为25.5份时,体系冲击强度达到46.3kJ/m^2,且综合性能良好;该三元共混体系的填充大量CaCO3(100份）时,仍能保持较高的缺口冲击强度（17kJ/m^2）,显示出良好的填充性。     

NBR/PVC共混物的共混工艺和性能

介绍NBR／PVC共混物的共混工艺和性能。NBR／PVC共混物共混工艺主要有乳液共沉法和机械共混法，其中乳液共沉法共混物性能较好，机械共混法操作简单、成本较低。影响共混物性能的因素主要有NBR的门尼粘度和丙烯腈含量、PVC品种、NBR／PVC共混比、共混温度以及PVC在共混物中的分散程度等。     

NBR/PVC共混物耐溶剂性能的研究

考察了NBR／PVC共混比和NBR／PVC与EPDM,IIR或PU三元硫化共混物在天那水中的体积变化和物理性能变化。结果表明,当NBR／PVC以70／30共混时,二元共混物的耐溶剂性能最好;NBR／PVC／PU共混比为50／20／30时,三元共混物耐天那水性能最好,经天那水浸泡后的性能变化很小。     

增塑聚氯乙烯的改性研究

采用物理共混的方法,用粉末丁腈橡胶(PNBR)、乙烯-醋酸乙烯酯-一氧化碳三元共聚物(Elvaloy 741)和甲基丙烯酸甲酯-丁二烯-苯乙烯三元共聚物(MBS)3种改性剂改性增塑聚氯乙烯(PVC),通过对透光性能、力学性能、硬度和微观结构等性能测试,研究了3种改性剂对增塑PVC性能的影响。结果表明,MBS和Elvaloy741对增塑PVC的透明性影响较小,PNBR的加入导致增塑PVC不透明,呈乳白色;随着改性剂的加入,共混物的拉伸强度降低,断裂伸长率升高,低温冲击强度增大,脆性温度降低。     

三元共聚尼龙/聚氯乙烯/丁腈橡胶三元共混弹性体研究

选择三元共聚尼龙（PA），聚氯乙烯（PVC）和丁腈橡胶（NBR）为主体材料，采用高温机械共混，化学交联工艺制得了PA／PVC／NBR三元共混弹性体，探讨了PA／NBR，POM／NBR，PVC／NBR，HMWPVC／NBR三元共混体系性能，重点讨论了PA／PVC／NBR共混比，不同硫化体系，有机过氧物DCP用量等因素对PA／PVC／NBR三元共混弹性体性能的影响，实验结果表明：选择适宜配方制得力学性能和耐油耐溶剂性能较好的PA／PVC／NBR三元共混弹性体，扫描电镜的实验结果证实m(PA):m(PVC):m(NBR)=10:30:60和m(PA):m(PVC):m(NBR)=30:10:60两个体系的三元共混弹性体均具有较好的相容性，且前者的相容性更好。     

滑石粉填充PVC/NR、PVC/Elvaloy741和PVC/Elvaloy741/NR三种共混体系研究

本文在研究ＰＶＣ／ＮＲ、ＰＶＣ／Ｅｌｖａｌｏｙ７４１和ＰＶＣ／Ｅｌｖａｌｏｙ７４１／ＮＲ三种共混体系的基础上,以滑石粉填充以上三种共混体系,并对其物理机械性能的测试结果进行了讨论。     

PVC/Elvaloy741/MBS及PVC/Elvaloy741/MBS/CaCO_3共混填充体系的研究

研究了 PVC/Elvaloy74 1 /MBS及 PVC/Elvaloy74 1 /MBS/Ca CO3共混填充新体系 ,并对其物理机械性能的测试结果进行了讨论。结果表明 :当 PVC为 1 0 0份、Elvaloy74 1为 6份、MBS用量为 2 5.5份时 ,体系冲击强度达到 4 6.3 k J/m2 ,且综合性能良好 ;该三元共混体系在填充大量 Ca CO3(1 0 0份 )时 ,仍能保持较高的缺口冲击强度 (1 7k J/m2 ) ,显示出良好的填充性     

Effects of compatibilizer type and rubber‐wood sawdust content on the mechanical,morphological, and thermal properties of PVC/LDPE blend

This article aimed to investigate the mechanical, morphological and thermal properties of PVC/LDPE blend with and without the addition of compatibilizers. The effects of LDPE content, compatibilizer type and rubber‐wood sawdust loading on the properties of the blend were evaluated. The experimental results suggested that as the LDPE content was increased the mechanical properties of PVC‐LDPE blend progressively decreased due to poor interfacial adhesion. The continuity and compatibility between PVC and LDPE phases could be improved through three different types of compatibilizers which included chlorinated polyethylene (CPE) poly(methyl‐methacrylate‐co‐butyl acrylate) (PA20) and poly(ethylene‐co‐methacrylate) (Elvaloy). The PA20 was found to be the most suitable compatibilizer for the blend. A radical transfer reaction was proposed in this work to explain the structure and thermal changes of the PVC in PVC‐LDPE blend. The decomposition temperature of PVC in the blend decreased with the loading of the PA20 and the wood sawdust. As the sawdust content was increased the tensile and flexural moduli increased with considerable decreased in the tensile, flexural and impact strength, a slight improvement being achieved if the PA20 was incorporated in the composite. © 2006 Wiley Periodicals, Inc. J Appl Polym Sci 102: 598–606, 2006     

Preparation and characterization of acrylonitrile–styrene–methylmethacrylate terpolymer as a compatibilizer for rubber blends

Acrylonitrile‐co‐styrene‐co‐methylmethacrylate (AN‐S‐MMA) terpolymer was prepared by bulk and emulsifier‐free emulsion polymerization techniques. The bulk and emulsion terpolymers were characterized by means of Fourierr transform infrared spectroscopy, ¹³C nuclear magnetic resonance (NMR) spectroscopy, gel permeation chromatography, thermal gravimetric analysis, and elemental analysis. The kinetics of the terpolymerization were studied. The terpolymers were then incorporated into butadiene—acrylonitrile rubber (NBR)/ethylene propylene diene monomer rubber (EPDM) blends and into chloroprene rubber (CR)/EPDM blend. The terpolymers were then tested for potential as compatibilizers by using scanning electron microscopy and differential scanning calorimetry. The terpolymers improved the compatibility of CR/EPDM and NBR/EPDM blends. The physicomechanical properties of CR/EPDM and NBR/EPDM blend vulcanizates revealed that the incorporation of terpolymers was advantageous, since they resulted in blend vulcanizates with higher 100% moduli and with more thermally stable mechanical properties than the individual rubbers. © 2003 Wiley Periodicals, Inc. J Appl Polym Sci 89: 3143–3153, 2003     

Polymer reprocessing: Properties of polyethylene—polyvinyl chloride mixtures

The increasing tendency to consider waste polymers as suitable stocks for reconversion calls for guidelines as to the processing and end-product behavior of mixtures involving commodity polymers. In the present case, flow and some mechanical properties of mixtures involving low density polyethylene (PE) and filled polyvinyl chloride (PVC) were determined and used as a base-line of comparison with similar properties of multi-component mixtures involving potential compatibilizers for the incompatible matrix pair. Chlorinated polyethylene (CPE) ethylene-vinyl acetate (EVA) copolymer and ELvaloy polymeric plasticizer were the property modifiers selected. Blends were produced by roll-mill, Brabender or Banbury mixing. Flow properties were measured by capillary viscometry and solid-state properties were characterized by stress-strain data and tensile impact performance. Melt viscosities were non-linear functions of blend composition and varied significantly with the choice of compatibiliser, EVA and CPE producing greater benefits of melt strength than did Elvaloy. Elastic moduli, ultimate tensiles and tensile impact data also responded to the presence of compatibiliser, the EVA and CPE again being more effective in upgrading the properties of the incompatible matrix pair than was Elvaloy. Results, while preliminary, suggest guidelines for the composition of PE/PVC stocks with upgraded performance balance.     

HPVC/SBR共混体系相容性的研究

采用动态硫化方法制备高聚合度聚氯乙烯（ＨＰＶＣ）／ＳＢＲ共混型热塑性弹性体,考察了单一组分相容剂「相容剂分别为ＮＢＲ２７０、ＮＢＲ Ｐ６５、ＣＰＥ和氢化苯乙烯－丁二烯、苯乙烯嵌段共聚物（ＳＥＢＳ）」、复合相容剂（ＳＥＢＳ／ＮＢＲ和ＣＰＥ／ＮＢＲ）及交联程度对ＨＰＶＣ／ＳＢＲ共混体系相容性的影响。结果表明,使用复合相容剂可明显改善ＨＰＶＣ／ＳＢＲ共混物的性能;动态硫化在改善共混物力学性能方面起主要作     

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。