聚偏氯乙烯废弃物的利用

介绍聚偏氯乙烯生产和吹膜过程中产生的废弃物回收利用的几个实例,说明在使用聚偏氯乙烯时要充分利用其使用价值.     

利用聚偏二氯乙烯薄膜边角料制备其加工用母料的方法

本文叙述了用ＰＶＤＣ吹膜过程中产生的边角废膜制造其加工用母粒的方法，为了检验这种方法的可靠性。奖含母粒的树脂吹成的薄膜与纯树脂吹砀薄膜之力学性能和阻隔性进行对比。并和分析两各原结晶形态、进一步说明这种母粒在加工中的良好作用。     

利用聚偏二氯乙烯薄膜边角料制备其加工用母粒的方法

本文叙述了用ＰＶＤＣ吹膜过程中产生的边角废膜制造其加工用母粒的方法。为了检验这种方法的可靠性，奖含母粒的树脂吹成的薄膜与纯树脂吹成的薄膜之力学性能和阻隔性进行对比，并通过观察和分析两种薄膜的结晶形态，进一步说明这种母粒在加工中的良好作用     

聚偏二氯乙烯的应用与环保

1 前言半个世纪以来,聚偏二氯乙烯(PVDC)作为一种多用途的聚合物,因其杰出的透明性、柔韧性、热封性和高阻隔性而一直保持了良好的声誉。PVDC聚合物因其特有的结构,对氧气、水气、CO_2、油脂等具有极强的阻隔性,化学性能稳定,制成的各种包装材料可广泛安全地用于食品、药品、化妆品,并可用于     

聚偏二氯乙烯保鲜膜的开发与应用

一、概述 聚偏二氯乙烯(PVDC)是氯乙烯(VC)和偏二氯乙烯(VDC)的共聚物,一般采用乳液法聚合工艺生产。以合适比例聚合的树脂再进行挤压、吹膜可以得到优异的保鲜包装材料。PVDC薄膜的首要特性是优良的阻隔性能,即很低的透氧率和透湿率     

聚偏氯乙烯成膜用助剂

通过对聚偏氯乙烯(PVDC)树脂的结晶性及其热不稳定性的讨论，介绍了在成膜时提高树脂加工性、稳定性和薄膜强度等性能的加工助剂和改性剂。     

聚偏二氯乙烯用途及生产技术

介绍聚偏二氯乙烯共聚物性能、品种及主要用途和国内外生产应用概况,分析了国内开发及市场现状提出对开发此类产品的建议。     

四苯基氯化鏻对聚偏氟乙烯电活性相的诱导作用

通过简单的熔体共混方法,将不同质量分数的高熔点高活性的四苯基氯化鏻(TPPC)与聚偏氟乙烯(PVDF)混合,探究了TPPC对PVDF极性相的诱导作用,并研究了此体系与熔体结晶过程最为相近的非等温结晶过程。结果表明,添加极少量(0.4%)的TPPC即可以使PVDF直接从熔体中全部以极性相结晶,这归因于TPPC固体表面的电荷与PVDF分子链之间强烈的相互作用。TPPC的加入使PVDF的非等温结晶行为发生了很大的变化,当TPPC含量达到0.4%时,降温结晶曲线出现两个结晶峰,也是这种反常的结晶行为才能使PVDF几乎全部以极性相结晶。     

聚偏氟乙烯熔体的流变特性

综述了聚偏氟乙烯树脂的性能、其熔体的流变特性及在熔融加工领域的广泛应用,详细介绍了剪切变稀的非牛顿流体流变行为及其影响因素。通过分子链支化、共混和共聚可改善PVDF熔体的流变性能,以满足不同性能制品的需求以及进一步拓宽熔融加工成型方法。     

聚偏二氟乙烯注塑成型技术

从注塑成型制品设计、模具设计、成型工艺参数的选择与控制等方面对聚偏二氟乙烯(PVDF)进行了讨论;重点介绍了成型工艺流程和工艺参数的设定,并对成型工艺条件进行了分析;系统介绍了聚偏二氟乙烯注塑成型工艺中常见问题及解决方法。     

Poly(vinylidene fluoride) - poly(methyl methacrylate) blends

A dynamic mechanical study of four blends of PVdF and PMMA plus the constituent homopolymers indicates that these two polymers are partly compatible, but that a crystalline PVdF phase also exists. The pure PVdF sample showed four transitions at ?95°, ?25° 75° and 100°C which are ascribed to a restricted chain motion of the Schatzki type, to a crystalline phase transition, to the glass transition and to premelting of poorly formed crystallites respectively. A longitudinal sonic velocity versus composition plot is interpreted in terms of the overall morphology of the blends whilst differential scanning calorimetry measurements are used to study crystalline melting.     

Investigation of Ferroelectricity in Poly(methyl vinylidene cyanide)

The ferroelectric and piezoelectric properties of newly synthesized polymer systems have been studied. To date PVDF and its copolymers P(VDF-TrFE) have provided the bulk of the knowledge pertaining to ferroelectricity in polymers. Recently, ultrathin ferroelectric films of P(VDF-TrFE) 70:30 have been fabricated using the Langmuir-Blodgett technique [4]. In this study, various new polymers have been synthesized by chemically altering the PVDF structure. This alteration was performed in order to enhance the amphiphilic nature of the polymer and thus improve the LB film quality and control. Various chemical groups have been used to replace the electropositive hydrogen and electronegative fluorine found in the traditional PVDF chemical structure, including Nitrile, Ester, and Methyl groups. In all cases the resulting chemical structure provides for a net dipole moment directed from the electronegative side of the monomer to the electropositive side. However, to obtain ferroelectricity these microscopic dipoles must first pack in a manner such that a reversible macroscopic dipole is obtained. Both structural and dielectric studies have been performed on a number of newly synthesized systems. The structural properties of these new materials were probed using both temperature-dependent x-ray diffraction and differential scanning calorimetry, while dielectric properties were investigated using electric field and temperature-dependent capacitance and polarization measurements.     

Poly(vinylidene fluoride) (PVDF) membranes for fluid separation

The importance of poly(vinylidene fluoride) (PVDF) as a membrane material has long been recognised in many membrane processes. Compared to other types of polymeric membranes, the PVDF membranes have received great attention because of its outstanding properties including high hydrophobicity, thermal stability, chemical resistance and excellent mechanical strength. This article provides an overview of recent development in PVDF membrane processes, focussing on the commercial PVDF membrane products for water and wastewater treatment and possible applications of PVDF membranes in areas such as membrane based gas absorption and membrane distillation where no substantial commercial PVDF membrane processes are available so far.     

聚偏氟乙烯-六氟丙烯接枝聚丙烯酸磺酸丙酯制备质子膜

以聚偏氟乙烯(PVDF)-六氟丙烯(HFP)中PVDF的仲氟原子直接引发甲基丙烯酸(3-磺酸钾)丙酯(SPMA)的原子转移自由基聚合,成功得到以PVDF-HFP为主链、侧链含磺酸基团的接枝聚合物(PVDF-HFP-g-PSPMA)质子交换膜. 通过红外、核磁分析方法对PVDF-HFP-g-PSPMA的结构进行表征. 反应不同时间得到的PVDF-HFP-g-PSPMA离子交换容量为0.051~0.59 meq/g,质子传导率为(2.58~30.9)×10-2 S/m.     

Polymeric Additives for Poly(Vinyl Chloride)

The melt and physical properties of PVC compounds and articles are strongly influenced by the morphology of the PVC. PVC powder exists as various agglomerates [l-41 wherein the primary particles are bound together as “grains” which in turn may be collected and enveloped in a “skin” in the case of the most common, suspension polymerized, PVC. We will discuss the influence on and interaction with these various PVC structures and the polymeric additives classified as processing aids, impact modifiers, and surfacealtering agents.     

聚偏氟乙烯的宽频介电谱特征研究

采用熔融法制备了聚偏氟乙烯（PVDF）样品,通过X射线衍射仪、傅里叶变换红外光谱仪和宽频介电谱分析仪对PVDF样品的结构及介电性能进行了测试分析。结果表明,熔融法获得的PVDF主要含α相;在40～100℃范围内出现由玻璃化转变引起的α-PVDF的松弛现象, 在-100～-50 ℃范围内出现的δ-PVDF松弛,是由非晶区分子运动产生的极化现象。     

Performance Evaluation of Alkaline Treated Poly(vinylidene fluoride) Membranes

A poly(vinylidene fluoride) (PVDF) hollow fiber membrane surface was modified by alkaline treatment in this study. This subject was selected with the aim to confirm the mechanisms of alkaline degradation of PVDF membranes, characterize the variations of membrane surface morphology (e.g., average pore size, pore size distribution, porosity, etc.), and estimate the membrane fouling potential by a bench-scale test with synthetic surface water. The conditions of the alkaline treatment covered various concentrations, temperature, and processing time. The results of this study indicate that the hydrophilic PVDF membranes can be obtained after appropriate treatment without loss of integrity of the membrane surface. All factors, including the concentration of NaOH, temperature, and processing time affect membrane properties. The surface images and air flow rate of unmodified and modified membranes showed difference in their average pore size and pore size distribution. In general, the increase of the processing time decreases the average pore size at constant concentration and temperature; the increase of the NaOH concentration in solution and temperature fastens the degradation process. Membrane pure water flux decreased after alkaline treatment. This can be attributed to the decrease of pore size. However, the membrane anti-fouling potential increased after alkaline treatment due to the enhancement of hydrophilic property of membrane surface.