聚丙烯纤维滤棒增塑剂试制

本文讨论了聚丙烯丝束滤棒成型的溶液型和单体型增塑剂之配方设计和组分选择。报导了它们在醋纤滤棒成型机上试制聚丙烯纤维滤棒的结果。结果表明，所试制的聚丙烯纤维滤律的质量指标合格。     

无规聚丙烯改性研究

无规聚丙烯氯化后,与丙烯腈、苯乙烯、丙烯酸丁酯按比例混合,在适当溶剂中进行热压本体悬浮聚合,得到接枝共聚物,抗冲击强度达275kg·cm/cm2,抗张强度417kg/cm2,是一种新型热塑性工程塑料.     

纳米CaCO3/聚丙烯的结晶熔融多峰行为研究

用差示扫描量热法(DSC)研究了纳米CaCO3/PP和改性纳米CaCO3/PP的非等温和等温结晶的多熔融行为。结果表明纳米CaCO3明显提高PP的结晶温度,诱导PP形成β晶。反应性单体改性纳米CaCO3/PP的结晶温度进一步提高,但对β晶熔融峰强影响不大。而在引发剂存在下反应性单体改性的纳米CaCO3/PP,促进β晶的熔融峰强明显增强。PP出现双熔融峰与PP形成β晶或者在等温结晶时形成两种不同形态有关。结晶温度提高,双峰移向高温;纳米CaCO3/PP的高温熔融峰高比低温熔融峰的高,但改性纳米CaCO3/PP在较高结晶温度时,高温熔融峰高反而比低温熔融峰的低。延长等温结晶时间对熔融峰温影响不大。     

改性聚丙烯的研究进展及其前景

本文综述了改性聚丙烯的物理和化学方法的研究现状，并对不同的改性方法分析了其特点，同时指出了改性后的聚丙烯的性能改变和具有的特性。     

A comparison study on the melt crystallization kinetics of long chain branched and linear isotactic polypropylenes

The isothermal and non-isothermal crystallization kinetics of LCBPP and linear-iPP was investigated by optical microscopy and differential scanning calorimetry （DSC）. The optical microscopy results in the isothermal crystallization process show that the crystals of LCBPP grow slower than the crystals of the linear-iPP. This originates from the low chain mobility, or in other words, the lower chain diffusion rate of LCBPP due to the existence of long side chains. The DSC results in the isothermal crystallization process show that the LCBPP exhibits, however, a higher overall crystallization rate with respect to the linear-iPP. This is related to the higher nucleation ability of LCBPP since the isothermal crystallization process of both LCBPP and linear-iPP are nucleation-dominated. Avrami analysis indicates that the nucleation nature and crystal growth manner of LCBPP and linear-iPP are about the same. The analyses of the non-isothermal crystallization processes indicate an increment in crystallization rate with increasing cooling rate. But at any cooling rate, the linear-iPP crystallizes more quickly than the LCBPP. This implies that the non-isothermal crystallization processes of LCBPP and linear-iPP are diffusion-dominated, in which the lower chain diffusion rate of LCBPP results in the slower crystallization of it.     

Thermal Stability of Poly （acrylonitrile-methyl acrylate） Copolymers

Poly （ acrylonitrile-methyl acrylate） copolymer was synthesized by water depositing polymerization and has a typical feed ratio of 85/15. And then 1 - 3 wt% lauryl alcohol maleic anhydride （LAM） was adopted as stabilizer to mix with the acrylonitrile based copolymer. The mixtures were characterized by using Fourier Transform Infrared Spectroscopy （FTIR）, Nuclear Magnetic Resonance （1 H NMR ）, Gel Permeation Chromatography （ GPC ）, Differential Scanning Calorimetry （DSC）, optic microscope and Ubbelohde viscosimetryr etc. The melting point （Tm） and glass transition temperature （Tg） of the 85/15 AN/MA copolymer mixed with LAM all decrease with the increase of stabilizer content. The lowest Tg and Tm were 116.1℃ and 209. 1℃ respectively at the heating rate of 100℃/min when the content of LAM is 2 wt%. The 85/15 AN/MA copolymer mixed with 1 - 3 w t% LAM possess good thermal stability up to 30 min at 220 ℃.     

粉煤灰与聚丙烯纤维复合高性能混凝土在机场道面工程中的应用

结合某机场扩建改造工程研究了粉煤灰与聚丙烯纤维复合高性能混凝土的力学性能、干缩性能、耐磨耗性能、疲劳性能和抗裂性能.试验结果表明,粉煤灰与聚丙烯纤维复合道面高性能混凝土能提高混凝土的力学性能、提高耐磨耗性能,增强道面的使用性能,可应用于机场道面工程中.     

氢氧化镁填充量对聚丙烯阻燃性能的研究

以氢氧化镁为阻燃剂,硅烷偶联剂为改性剂,不同填充量的氢氧化镁加入到聚丙烯中所得的复合材料的阻燃和力学性能。结果表明,随着氢氧化镁填充量的增加,复合体系的阻燃性能逐渐提高,但随着氢氧化镁添加量的增多,聚丙烯的力学性能,如拉伸强度,冲击强度,都会有明显的下降。所以综合各因素考虑,氢氧化镁添加量为100份时最适宜。     

聚丙烯表面醋酸乙烯酯的脉冲等离子体聚合及其性能

利用脉冲等离子体聚合的低处理能量密度、高基团保留的特点,以醋酸乙烯酯(VAc)的脉冲等离子体聚合方法对聚丙烯(PP)表面作了改性.研究了脉冲占空比(τon/τoff)对VAc等离子体聚合物的结构与性能的影响.聚合量随着占空比的提高呈先升高,然后在占空比150/50时降低,这是等离子体的聚合/刻蚀共同作用的结果.由于VAc等离子体聚合是通过逐步增长聚合机理(RSGP)进行的,其聚合物中含有交联结构.VAc聚合物可部分被醇解为聚乙烯醇结构,其交联结构是抑制进一步醇解的因素.但红外分析及VAc聚合物中可溶性物质含量测试结果表明,低占空比下VAc聚合物的结构破坏较轻且低交联结构较多,占空比50/150处理表面醇解后的表面水接触角降低到66.0°,改善了载体PP表面的亲水性.