单组分氯磺化聚乙烯防腐涂料

介绍单组分氯磺化聚乙烯防腐涂料的选材、配方及制备工艺。     

聚丙烯/高密度聚乙烯混炼对竹木塑复合材料性能的影响

用聚丙烯(PP)、高密度聚乙烯(HDPE)共混制备竹木塑复合材料,研究其对复合材料力学性能和微观结构的影响,同时对比竹粉与木粉对材料性能的影响.结果表明:竹塑复合材料的拉伸强度较高;加入一定量的高密度聚乙烯可以提高聚丙烯/竹粉复合材料的冲击和弯曲强度;竹粉与塑料的相容性比木粉好,木塑复合材料的主要破坏形式是木粉与塑料的...     

聚磷酸铵对聚丙烯／聚乙烯复合材料阻燃性能的影响

通过力学性能测试、氧指数测试研究了聚磷酸铵（APP）对聚丙烯（PP）／聚乙烯（PE）复合材料的力学性能和阻燃性能的影响。结果表明：APP的加入,PP/PE复合材料的拉伸强度开始增加,当添加量超过25％后,其拉伸强度开始降低;冲击强度是先增大后减小,但包覆APP变化的趋势比较大;氧指数逐渐增大．包覆APP的氧指数均好于硅烷处理APP的氧指数。     

氧化聚乙烯蜡对聚丙烯/剑麻纤维复合材料力学性能的影响

采用熔融共混与注塑成型的方法制备了聚丙烯/氧化聚乙烯蜡/剑麻纤维(PP/OPE/SF)复合材料,研究了氧化聚乙烯蜡(OPE)对复合材料力学性能的影响.结果表明,OPE显著提高了复合材料的冲击强度,适当添加量的OPE增强了PP/SF的界面键合,提高了复合材料的拉伸强度和拉伸模量.     

固相接枝聚乙烯蜡及其在聚丙烯/滑石粉复合材料中应用

以甲基丙烯酸甲酯(MMA)为接枝单体、过氧化苯甲酰为引发剂和甲苯为界面剂,采用固相接枝工艺制备了聚乙烯蜡(PEW)接枝MMA,将PEW接枝MMA应用到PP/滑石粉复合材料中,考察了接枝PEW用量对PP/滑石粉复合材料宏观性能的影响.研究表明,固相接枝技术可以成功制备出熔点几乎没有变化的极性PEW,接枝前后的PEW接触角...     

超高相对分子质量聚乙烯/聚丙烯共混物研究进展

回顾了超高相对分子质量聚乙烯(PE-UHMW)与聚丙烯(PP)共混物的研究进展.介绍了PE-UHMW/PP共混物的制备方法,性能(加工流变性能、力学性能、摩擦磨损性能)及结晶和微观形态的研究现状,并展望了PE-UHMW/PP共混物的研究方向.     

聚丙烯/高密度聚乙烯/氮化硼导热复合材料的制备及性能研究

以聚丙烯（PP）/高密度聚乙烯（HDPE）共混物为基体,六方氮化硼（h-BN）为导热填料,聚丙烯接枝马来酸酐（PP-g-MAH）为相容剂,通过熔融共混法制备PP/HDPE/h-BN和PP/HDPE/h-BN/PP-g-MAH导热复合材料。采用导热系数仪、场发射扫描电镜、万能试验机、热分析仪等测试导热复合材料,研究不同含量的h-BN、PP-g-MAH对复合材料导热性、力学性能、结晶性能和耐热性的影响。结果表明：随着h-BN含量的增加,PP/HDPE/h-BN复合材料的弯曲强度、热导率和耐热性提高。当h-BN含量为20%,复合材料的弯曲强度达到41.02 MPa;当h-BN含量为25%,复合材料热导率达到0.372 1 W/（m·K）。h-BN对PP的结晶具有促进作用,提升PP的结晶速率和结晶温度。PP、HDPE与h-BN质量比为64∶16∶15时,添加5%的PP-g-MAH,增强了h-BN和基体材料的界面相容性,复合材料的弯曲强度达到42.72 MPa,拉伸强度达到26.64 MPa,热导率达到0.356 1 W/（m·K）。     

氯化聚乙烯对聚丙烯／滑石粉复合材料性能影响的研究

本文对ＰＰ／Ｔａｌｃ二元复合材料和ＰＰ／ＣＰＥ／Ｔａｌｃ三元复合材料的物理机械性能，流变性能，熔体流动性能和形态结构进行初步研究。研究结果表明，ＣＰＥ作为第三组分加到ＰＰ／Ｔａｌｃ二元复合材料体系中，对其综合性能并未提高，似乎有下降的趋势。这表明Ｔａｌｃ填充ＰＰ是一个较为理想的体系，无需再加入ＣＰＥ这类高分子抗冲改性剂作为第三组分。并从形态结构进行了阐述。     

玻璃纤维增强聚丙烯复合材料研究进展

对玻璃纤维增强聚丙烯复合材料的研究近况进行了简单介绍,对其界面改性、增韧增强、结晶行为、长切玻璃纤维增强、材料性能及成型工艺条件进行了较详细的讨论,并对该复合材料今后的研究进行了展望。     

红磷包覆对PP／PE复合材料阻燃性的影响

通过力学性能测试、氧指数测试研究了有机包覆和无机包覆红磷对聚丙烯（PP）／聚乙烯（PE）复合材料的力学性能和阻燃性能的影响。结果表明：随着红磷的加入,PP/PE的拉伸强度和冲击强度均得到了提高,极限氧指数（LOI）逐渐增大,添加有机包覆红磷的PP／PE复合材料的LOI均好于同比添加无机包覆红磷复合材料的LOI。     

PP/POE/PE/CaCO3/PP-g-MAH复合材料力学性能的研究

采用熔融共混法制备聚丙烯/聚烯烃弹性体/聚乙烯/马来酸酐接枝聚丙烯（PP/POE/PE/CaCO3/PP-g-MAH）复合材料,并研究其力学性能。结果表明：PP-g-MAH可提高PP与CaCO3的相容性,使复合材料的韧性和拉伸性能得到提高,PE可提高PP与POE的相容性,并有效提高复合材料的韧性,经POE、PE、CaCO3和PP-g-MAH之间的相互协同改性作用可制得综合性能优良的PP复合材料。     

聚丙烯共混增韧改性研究

通过共混聚乙烯研究共聚聚丙烯的改性,考察了对其机械性能特别是冲击性能的影响。     

Mechanical Properties and Morphology of Ternary PP/EPDM/PE Blends

The ternary blends of high‐density polyethylene (PE), EPDM terpolymer and polypropylene (PP) have been used as a model low interfacial tension system to study encapsulation dynamics in ternary blends and their relation to the blends' mechanical properties. It was found that the modulus, tensile strength and impact resistance can be improved by PE addition if the PE is localized within the EPDM phase. A range of blend morphology was found depending on the PE viscosity and polymer incorporation sequence in the twin‐screw extruder. In the most favorable sequence, PE and EPDM were mixed together prior to their dispersion in the PP matrix. This practice resulted in a 50% increase in impact resistance when compared to mixing the three components in a single‐step.     

Microcellular foaming of PE/PP blends

Three different polyethylene/polypropylene (PE/PP) blends were microcellular foamed and their crystallinities and melt strengths were investigated. The relationship between crystallinity, melt strength, and cellular structure was studied. Experimental results showed that the three blends had similar variation patterns in respect of crystallinity, melt strength, and cellular structure, and these variation patterns were correlative for each blend. For all blends, the melt strength and PP melting point initially heightened and then lowered, the PP crystallinity first decreased, and then increased as the PE content increased. At PE content of 30%, the melt strength and PP melting point were highest and the PP crystallinity was least. The blend with lower PP crystallinity and higher melt strength had better cellular structure and broader microcellular foaming temperature range. So, three blends had best cellular structure at PE content of 30%. Furthermore, when compared with PE/homopolymer (hPP) blend, the PE/copolymer PP (cPP) blend had higher melt strength, better cellular structure, and wider microcellular foaming temperature range, so it was more suited to be microcellular foamed. Whereas LDPE/cPP blend had the broadest microcellular foaming temperature range because of its highest melt strength within three blends. © 2007 Wiley Periodicals, Inc. J Appl Polym Sci 104: 4149–4159, 2007     

PP/PE共混物的红外光谱分析

采用傅立叶变换红外光谱法对PP和PE的共混物进行了分析。结果表明 :用红外光谱法可以测定PP/PE共混物中PE的含量和结晶度 ;PP与质量分数为 0～ 10 %的PE熔融共混后 ,其红外光谱未见明显偏离两者各自的特征 ,但是差谱结果表明PE与PP存在一定的相互作用。     

国内聚乙烯和聚丙烯市场分析

介绍了国内聚乙烯、聚丙烯工业生产、需求和发展状况 ,分析了产品和消费结构、价格走势及其影响因素 ,并在此基础上预测了今后的市场趋势     

PP/PE blends. IV. Characterization and compatibilization of blends of postconsumer resin with virgin PP and HDPE

The mechanical properties of blends of isotactic polypropylene and high-density polyethylene with a postconsumer resin (recycled dairy containers) were investigated over the entire composition range. Modification of these blends with an ethylene/propylene/diene copolymer or an ethylene/vinyl acetate copolymer was also investigated. Isotactic polypropylene/postconsumer resin blends have satisfactory impact and tensile properties at postconsumer resin contents of less than 50% for certain applications. At higher postconsumer resin contents, the tensile properties were adversely affected. The impact properties remained satisfactory. Addition of an ethylene/propylene/diene copolymer improved the mechanical properties of these blends to levels equal to or greater than those for neat isotactic polypropylene. Ethylene/vinyl acetate copolymers were also able to improve the mechanical properties, but not as efficiently as did the ethylene/propylene/diene copolymer. Blends of high-density polyethylene and a postconsumer resin had poor impact and tensile properties. Although the ethylene/propylene/diene copolymer and ethylene/vinyl acetate copolymers were able to improve these properties, the improvement was insufficient for general recycling, except at lower (≤25%) postconsumer resin contents. © 1998 John Wiley & Sons, Inc. J Appl Polym Sci 70: 2081–2095, 1998     

复合型树脂基导电聚合物研究进展

概述了导电聚合物的特点、分类及相应的导电机理。综述了国内外复合型导电聚合物的最新研究进展、技术成果以及应用领域。