HDPE／PC／相容剂／蒙脱土复合材料性能的研究

研究了HDPE／PC／增容剂／蒙脱土共混复合体系的力学性能和熔体的流变性能。结果表明，加入适量的增容剂和蒙脱土对HDPE／PC复合材料力学性能有一定的提高。在所研究的剪切应力、剪切速率、温度及组成范围内，该复合材料的lgη-lgγ曲线都偏离牛顿流体曲线，为非牛顿假塑性流体。经过有机化处理的蒙脱土复合材料体系比未经有机化处理的蒙脱土复合材料体系有更好的流动性和力学性能。     

Comparative ozonization of LDPE and HDPE and grafting of some monomers to elaborate new ion exchange membranes

A comparative study of the ozonization of low density polyethylene (LDPE) and high density polyethylene (HDPE) was carried out. A grafting study of acrylic acid (AA), N,N‐dimethylamino‐2‐ethylmethacrylate (MADAME) and vinyl phosphonic acid (VPA) on LDPE and HDPE was performed in mass and solution. The ozonized polyethylene and the grafting polymers were characterized by IR spectroscopy and elementary analysis. Ion exchange membranes were prepared from grafted copolymers and characterized by the exchange capacity and electrical resistance. © 2006 Wiley Periodicals, Inc. J Appl Polym Sci 101: 4423–4429, 2006     

Cs交换Y沸石超笼中的磷钼杂多酸的制备、表征和催化性能

In order to solve the serious leaching problem of supported heteropoly acid catalysts in polar reaction media,12-molybdophosphoric acid encapsulated in the supercage of Cs⁺-exchanged Y zeolite was prepared by the "ship in the bottle" synthesis.The influence of ion-exchange conditions and the synthesis parameters on the encapsulation of PMo₁₂ were investigated.The obtained solid sample was characterized by X-ray diffraction(XRD),³¹P magic angle spin nuclear magnetic resonance(MAS NMR) and Fourier Transform Infrared Spectroscopy(FT-IR),and its catalytic activity in the esterification of acetic acid and n-butanol was tested.The ion-exchange time,concentration of aqueous Cs⁺ solution,pH value,and amount of Mo added in the synthesis mixture were revealed to influence the encapsulation very remarkably.Under the optimal conditions,12-molybdophosphoric acid could be successfully encapsulated in the supercage of CsY zeolite,and the samples showed considerable catalytic activity and excellent reusability in the esterification reaction.     

抗生素瓶塞中重金属含量测定方法的改进

抗生素瓶塞中重金属主要有铅、镉、锑等。重金属的含量通常是以测定其硫化物的含量来判定的。重金属含量是否合格是控制瓶塞质量的一项重要指标。     

CB填充HDPE/POE复合材料阻-温特性的研究

以乙炔碳黑(ACET)为导电填料,高密度聚乙烯/乙烯-辛烯共聚物(HDPE/POE)为基体,制备了碳黑(CB)填充HDPE/POE复合材料,并研究了该材料的电阻率-温度变化规律。     

Preparation of highly filled wood flour/recycled high density polyethylene composites by in situ reactive extrusion

Highly filled wood flour/recycled high density polyethylene (WF/RHDPE) composites were directly prepared by in situ reactive extrusion using a twin‐screw/single‐screw extruder system. The effects of dicumyl peroxide (DCP) content on extrusion pressure, rheological behavior, mechanical properties, fractured surface morphology of the composites, and melting temperature of RHDPE in the composites were investigated. The extrusion pressure and torque of WF/RHDPE composite melt increased with DCP content. Mechanical property tests and scanning electron microscopy analysis results confirmed that the interfacial interaction of the composites was improved by in situ reaction. The composites show lower melting peak temperature (T_m) than RHDPE. The cooling in profile extrusion shortened the crystallization time, resulting in decrease of crystalline order of RHDPE in the composites. There are no noticeable changes of T_m values with increasing DCP content. Comparative study on composites with maleic anhydride grafted polyethylene as compatibilizer demonstrated that mechanochemical treatment with DCP and maleic anhydride was an effective method to improve interfacial adhesion for WF/RHDPE composites. © 2011 Wiley Periodicals, Inc. J Appl Polym Sci, 2011     

超韧增强剂改性HDPE拉伸一眭能的研究

采用聚乙烯为载体,引入偶联剂处理的CaCO3,弹性体POE,同时加入适量抗氧剂和润滑剂等,制得超韧增强剂,并探讨了超韧增强剂含量对HDPE材料拉伸性能的影响。试验结果表明：随着超韧增强剂含量增加,复合体系拉伸强度呈下降趋势,而拉伸弹性模量则随之上升,当超韧增强剂增加到15％时,断裂伸长率达到最大值,出现脆韧转变。     

高密度聚乙烯/石墨/碳纤维导热复合材料性能的研究

采用高密度聚乙烯(HDPE)、石墨、碳纤维制备高导热、高强度的复合材料。通过SEM照片考察高密度聚乙烯/石墨/碳纤维复合体系的微观结构;研究石墨及碳纤维的加入是否可以形成导热通道以及随着石墨的添加量的提高,复合材料的导热性能及其力学性能的变化。结果表明:当石墨的质量分数为60%,碳纤维的质量分数为5%时,复合材料的导热系数达到7.938 W/(m.K),是纯HDPE的20倍。     

钢骨架塑料复合管的研究进展及对策

介绍了钢骨架塑料复合管的分类、结构、特性及成型,综述了国内外发展研究状况,指出了钢骨架塑料复合管面临的问题,结合实践提出了相应的解决对策。     

HDPE/PVDF/CB复合体系PTC性能的研究

以HDPE/PVDF共混物为基体 ,研究了两种不同类型炭黑 (CB)的用量 ,以及HDPE/PVDF配比对复合物的正电阻温度系数 (PTC)的影响。结果表明 ,HDPE/PVDF/CB三元复合体系具有很强的PTC特性 ,可用于制作电致发热稳定性良好、自限温度 ( 85± 5 )℃、具有商业用途的自控温伴热带