Effect of Mechanochemical Degradation on Rheological Behavior of PVC

The rheological behavior of mechanochemically degraded poly(vinyl chloride) (PVC) was studied through a Brabender plasticorder and capillary rheometer. The experimental results show that the degraded PVC has a much shorter plasticizing time, higher plasticizing rate, and lower melt viscosity and glass transition temperature as compared with undegraded PVC. The results provide a theoretical base for using the low molecular weight PVC prepared by the mechanochemical method as plasticizer for high molecular weight PVC.     

掺混树脂对PVC增塑糊性能的影响

采用PVC糊树脂与掺混树脂复配,研究各复配比例下,掺混树脂对增塑糊初始黏度及黏度稳定性、以及糊制品蒸发残渣性能的影响。结果表明:增塑糊初始黏度随掺混树脂比例的增加而逐渐减小;各体系糊黏度稳定性也相应变差,当CPM-31/SB-100=70/30时,PVC增塑糊的黏度稳定性最差,而CPM-31/SB-100=100/0时的黏度稳定性最好;掺混树脂的加入主要影响PVC糊制品在4%乙酸和正己烷浸泡溶剂下的蒸发残渣性能指标,且当掺混树脂含量为10份后两者残渣结果变化趋势相反。     

热稳定剂对聚氯乙烯光降解性能的影响

从聚氯乙烯光降解机理出发综述了常用热稳定剂(包括金属皂类、有机锡类、稀土类以及有机辅助类热稳定剂)对聚氯乙烯(PVC)光降解性能的影响,并展望了其发展方向。     

聚氯乙烯糊用掺混树脂对增塑糊加工性能的影响

文章通过实验研究了聚氯乙烯掺混树脂对增塑糊粘度陈化稳定性、凝胶性能等性能的影响,并分析其影响作用的机理。     

涤纶的亲水化及分散性能研究

采用碱处理对涤纶进行亲水化改性。用傅利叶变换红外光谱、X射线衍射、扫描电镜等分析手段对亲水化处理后涤纶的结构进行了表征 ,并探讨亲水化处理对纤维的亲水性、分散行为及与植物纤维混抄时抄造性能的影响。结果表明 ,碱处理后 ,涤纶的亲水性基团增多 ,结晶度下降 ,纤维表面产生微孔 ,纤维的亲水性得到明显改善 ,处理后的涤纶与植物纤维混抄时有较好的分散性能和抄造性能     

硬脂酸异辛酯在聚氯乙烯加工中的应用及其流变性能的研究

研究了硬脂酸异辛酯(EHO)作为聚氯乙烯树脂增塑剂使用的可能性和适宜用量,以及对聚氯乙烯流变性能的影响。实验结果表明:EHO只能作为聚氯乙烯的辅助增塑剂使用,适宜用量为5～10份;当EHO与邻苯二甲酸二辛酯(DOP)以5:45混合使用时,可提高聚氯乙烯软制品的拉伸强度、断裂伸长率和耐寒性等性能。同时,通过流变性能实验,发现EHO在聚氯乙烯硬塑料中具有良好的润滑作用。     

巯基乙酸盐在PVC中的稳定性研究

以巯基乙酸钡和巯基乙酸钡-钠作为稳定剂,添加到聚氯乙烯(PVC)中,通过刚果红实验法、热老化箱实验法和转矩流变仪等对PVC的静态与动态热稳定性能进行综合评价。结果表明:巯基乙酸钡和巯基乙酸钡-钠都能提高PVC的热稳定性,但巯基乙酸钡的稳定性要好于巯基乙酸钡-钠。     

环保聚氯乙烯增塑糊凝胶性能的研究

采用转矩流变仪和旋转黏度计研究了PVC树脂种类、增塑剂种类、掺混树脂加入量对环保PVC增塑糊凝胶性能的影响规律。结果表明,PVC糊树脂聚合度越大,增塑糊的凝胶化时间越长;颗粒呈规则圆状树脂配制的增塑糊,其凝胶时间相对较长;颗粒呈扁片状的树脂配制的增塑糊,其凝胶时间相对较短。增塑剂与PVC糊树脂相容性越差,增塑糊的凝胶时间越长。随掺混树脂添加量的增多,凝胶时间逐渐延长,当其加入量为40 份（质量份,下同）时,凝胶时间从空白时的18 min延长至28 min。     

PVC的共混改性研究进展

阐述了近年来对PVC的共混改性研究工作,总结了不同物质,如弹性体、塑料、无机刚性粒子增韧PVC的机理。并讨论了部分PVC树脂共混体系的相容性及改性效果。     

透明PVC／MBS合金的研究

本文对不同型号的ＰＶＣ与ＭＢＳ进行共混改性,通过冲击,应力－应变试验,动态力学分析（ＤＭＡ）、扫描电镜（ＳＥＭ）和紫外可见光谱研究了ＰＶＣ／ＭＢＳ共混体系的性能与形态结构之间的关系。结果表明,用ＭＢＳ改性ＰＶＣ既能有效地提高共混物的韧性,又能保证其具有良好的透光率。     

Effect of embedding MWCNT-g-GO with PVC on the performance of PVC membranes for oily wastewater treatment

Abstract

In this work, polyvinyl chloride/multi-walled carbon nanotube-grafted-graphene oxide (PVC/MWCNT-g-GO) membranes were fabricated by employing a classical phase inversion method for use in the Al-Dura Refinery (Baghdad, Iraq) wastewater treatment. The effects of MWCNT-g-GO contents on the properties and performance of PVC/MWCNT-g-GO membranes (i.e., 0.0599, 0.119, and 0.219?wt.%) were investigated. Scanning electron microscope (SEM), Fourier-transform infrared spectroscopy (FTIR), atomic force microscopy (AFM), X-ray diffraction (XRD), differential scanning calorimetry (DSC), contact angle (CA), porosity, and mechanical properties were used to characterize the MWCNT-g-GO and composite membranes. The membrane performance was characterized by liquid permeation flux and chemical oxygen demand (COD) rejection. The SEM and AFM results showed significant effects of MWCNT-g-GO on the structural morphology of the membranes. Also, it was found that the addition of a 0.119?wt.% MWCNT-g-GO membrane greatly improved the CA and porosity, from 74.5° to 13.9° and from 69.3% to 81.4%, respectively. Adding 0.219?wt.% of MWCNT-g-GO to the casting solution produced a major positive impact in the membrane mechanical properties. With 0.119?wt.% of MWCNT-g-GO (e.g., 254?L/m²·h), the membrane fostered increases in the water permeation flux that were 66% greater than when using the neat PVC (e.g., 153?L/m²·h). The COD rejection of the prepared membranes also improved significantly, from 60% for neat PVC to 88.9% after adding 0.119?wt.% of MWCNT-g-GO.     

PVC热稳定性能评价方法的研究

以不同比例的CaSt2和ZnSt2对硬质PVC的热稳定作用为例,研究了刚果红法、热烘箱法、电导率法及HAAKE转矩流变仪法等4种方法在评价PVC热稳定性能中的应用。     

木粉和发泡剂对PVC基木塑复合发泡材料性能的影响

以木粉、聚氯乙烯树脂、发泡剂等为原料,通过连续挤出得到发泡木塑复合材料。对木粉的热失重、复合发泡材料的泡孔形态、力学性能进行了测试。结果表明:发泡剂用量不应超过1phr;在本实验范围内,木粉粒径的减小会使发泡更容易,材料的力学性能得到改善;木粉粒径对泡孔形态和力学性能的影响有一个最佳范围,即20~80目。     

碳酸钙对PVC增塑糊黏度及稳定性的影响研究

采用振动黏度计系统研究了碳酸钙粒径大小、含量及颗粒形貌对环保聚氯乙烯（PVC）增塑糊黏度及稳定性的影响规律。结果表明,用4.5um碳酸钙配制的增塑糊初始黏度最大,且黏度稳定性最差;固定PVC树脂为100份时,随碳酸钙含量的增加,增塑糊的初始黏度增大,黏度稳定性降低;固定PVC和碳酸钙粉体总量为120份时,随碳酸钙含量的增加,增塑糊的初始黏度减小,黏度稳定性升高;用规则菱形碳酸钙配制的增塑糊黏度相对较小,用棉絮状碳酸钙配制的增塑糊黏度相对较大,且黏度稳定性最差。     

改性无机微纳粉体在PVC中的应用

采用偶联剂对无机微纳粉体进行表面改性和处理,制成功能性添加剂。其在聚氯乙烯(PVC)中的应用结果表明:改性无机微纳粉体/PVC复合材料的力学性能、加工性能、相容性以及制品外观均优于未改性无机微纳粉体/PVC复合材料。     

Effects of paste resins on the foaming properties of PVC plastisols

This article studies the foaming properties of PVC plastisols prepared from six different types of PVC paste resins with different degrees of polymerization that were produced through two methods, a seed emulsion method and a micro-suspension method. The underlying mechanisms that result in differences in the foaming properties are discussed as well. The results indicate that formulation S5 has the best foaming quality using past resins produced with the seed emulsion method, and formulation S6 made the best plastisol samples from paste resins produced through the micro-suspension method. Seed emulsion-produced paste resins with low degrees of polymerization are more suitable for preparing high-quality foam materials. The parameters used to judge the foam quality are the initial decomposition temperature T_f (5%), T_f − Tη_max and T_f (5%) − Tη_max. The greater the value of these three parameters, the better the foaming effect. The degree of polymerization of the paste resin and the particle morphology directly affect the rheological parameters, namely Tη_max, of PVC plastisol, and subsequently affect the magnitude of T_f − Tη_max and T_f (5%) − Tη_max, which in turn affect the quality of the foam.     

Effect of the Incorporation of PVC on the Mechanical Properties of the Jute-Reinforced LLDPE Composite

Jute fabrics-reinforced linear low density polyethylene (LLDPE) matrix composites (50 wt% fiber) were prepared by compression molding and mechanical properties were studied. Polyvinyl chloride (PVC) matrix was incorporated instead of LLDPE in the jute based composites and their mechanical properties were investigated and compared with the control composites. It was found that with the increase of PVC in the LLDPE based composites, the mechanical properties were found to improve significantly. Degradation tests of the composites for upto 24 weeks were performed in soil medium. Water uptake and Thermo-mechanical properties of the composites were also studied.     

增塑剂在软质PVC中的发展

概述了增塑剂的品种和相关应用,并展望了高分子增塑剂在软质PVC中的发展趋势。提出利用PET废料制备（DOTP）,它是一种优良的PVC增塑剂。     

软质PVC／PU塑料合金的研制

以聚氯乙烯，增塑剂，聚酯二醇，二异氰酸酯及助剂为原料，用螺杆挤出机共混反应一步法制备了ＰＶＣ／ＰＵ塑料合金，讨论了原料及工艺条件对合金性能的影响，得到了该合金的基本配方。     

表面活性剂对旋转模塑用PVC增塑糊性能的影响

通过表面活性剂种类及用量对旋转模塑用ＰＶＣ增塑糊性能的影响进行较为深入的研究,从而为旋转模塑用ＰＶＣ增塑糊中表面活性剂种类及用量的确定提供了有益的参考