透明聚丙烯片材专用料研究

研究透明成核剂对均聚PP透明性能的影响。试验表明加入透明成核剂后,提高了PP的透光率,降低了雾度,力学性能得到了明显的改善,添加0.2%透明剂在160~230℃加工条件下生产的专用料,可以制得透明PP片材。     

PP－g－AA的制备和表征

用熔融接枝方法制备了聚丙烯－ｇ－丙烯酸（ＰＰ－ｇ－ＡＡ）。用光电子能谱，广角Ｘ射线衍射，红外光谱和化学滴定方法对接枝物进行了定性和定量表征。讨论了单体和引发剂浓度对接枝率的影响，确定了用红外光谱法测定接枝物含量的经验公式     

辐照技术在聚丙烯材料制备和改性中的应用

利用辐照的手段,来制备功能化的聚丙烯材料,在获得新功能的同时,不改变聚丙烯原有的优点,并综述了辐照技术在聚丙烯材料制备和改性中的研究及应用情况     

Influence of the ethylene–(methacrylic acid)–Zn2+ ionomer on the thermal and mechanical properties of blends of poly(propylene) (PP)/ethylene–(vinyl alcohol) copolymer (EVOH)

The thermal and mechanical properties and the morphologies of blends of poly(propylene) (PP) and an ethylene–(vinyl alcohol) copolymer (EVOH) and of blends of PP/EVOH/ethylene–(methacrylic acid)–Zn²⁺ ionomer were studied to establish the influence of the ionomer addition on the compatibilization of PP/EVOH blends and on their properties. The oxygen transmission rate (O₂TR) values of the blends were measured as well. PP and EVOH are initially incompatible as was determined by tensile tests and scanning electronic microscopy. Addition of the ionomer Zn²⁺ led to good compatibility and mechanical behaviour was improved in all blends. The mechanical properties on extruded films were studied for 90/10 and 80/20 w/w PP/EVOH blends compatibilized with 10 % of ionomer Zn²⁺. These experiments have shown that the tensile properties are better than in the injection‐moulded samples. The stretching during the extrusion improved the compatibility of the blends, diminishing the size of EVOH domains and enhancing their distribution in the PP matrix. As was to be expected, the EVOH improved the oxygen permeation of the films, even in compatibilized blends. Copyright © 2004 Society of Chemical Industry     

PP/EPDM/CaCO_3三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；较好的表面处理条件下，体系中加入较少量的ＥＰＤＭ即可使材料缺口冲击韧性和拉伸模量值同时达到较好水平。     

Rheological properties of polypropylene modified by high‐intensity ultrasonic waves

A new method using high‐intensity ultrasonic waves, instead of peroxide‐aided reactive extrusion, was applied to modify a linear polypropylene into a branched structure. The ultrasonic waves induced chain scission and created reactive macromolecules of polypropylene successfully in the melt state without any peroxide. To enhance and control the recombination reaction during sonication, a multifunctional agent and an antioxidant were used. The rheological property measurements clearly confirmed that the modified polypropylene had a nonlinear branched structure. It showed shear‐thinning behaviors in its viscosities at low frequencies, high elastic behaviors in Cole–Cole plots, and a high rheological polydispersity index in comparison with a linear polypropylene. The degradation or recombination of polypropylene was adequately controlled by an antioxidant, which stabilized the structure during sonication. Also, the use of an antioxidant was quite effective in improving the extrusion processability by delaying the instability of the extrudate to a higher shear rate. © 2005 Wiley Periodicals, Inc. J Appl Polym Sci, 2006     

EPDM/PP热塑性弹性体相态研究

采用透射电镜(TEM)研究动态硫化EPDM/PP热塑性弹性体制备工艺及增容改性对形态结构的影响,研究发现通过添加增容剂可使EPDM相呈颗粒分布于连续相中。     

对硝基苯偶氮2-羟基萘-3-甲酰烷基胺系聚丙烯纤维用红色染料的合成及应用

本文将2,3-酸在甲苯溶剂中用氯化亚砜酰氯化合成2-羟基萘-3-甲酰氯,将其分别和正丁胺、正辛胺、正十二胺和正十八胺反应制得4种不同碳链长度的2-羟基萘-3-甲酰烷基胺,用对硝基苯胺重氮盐与其偶合分别制得了对硝基苯偶氮2-羟基萘-3-甲酰正丁胺、对硝基苯偶氮2-羟基萘-3-甲酰正辛胺、对硝基苯偶氮2-羟基萘-3-甲酰正十二胺和对硝基苯偶氮2-羟基萘-3-甲酰正十八胺系聚丙烯纤维用红色染料。熔点分别为189.8℃、96.2℃、115.8℃和108.1℃;热分解点分别为273.1℃、216.0℃、258.0℃和221.0℃;最大吸收波长分别为515.8nm、516.8nm、513.6nm和514.2nm。在染色条件下,4支染料在聚丙烯纤维上的上染率分别37.6％、41.8％、42.4％和44.7％。     

PP-g-MAH对PA6/PP/TLCP三元共混物的增容改性作用

研究了PP-g-MAH对PA6／PP／TLCP三元共混体系的增容作用以及对共混物流变性能和力学性能的影响。通过共混物的DSC、SEM、POM、流变性能和力学性能测试，结果表明，PP－g-MAH对共混体系有明显的增容作用，共混物的力学性能（拉伸强度和冲击强度）得到提高；由于TLCP的加入，共混物的熔体粘度大大低于PA6的熔体粘度。     

一氧化碳对聚丙烯收率、结构的影响

分析研究了Montell(Himont)聚丙烯工艺中CO对聚丙烯收率、产品结构的影响。