刚性聚合物对PVC／CPE共混物的增强与增韧

本文中研究了在硬聚氯乙烯化聚乙烯共混物中加入刚性聚合物如丙烯酸酯类、对共混物力学性能和加工性能的影响。     

空心微珠改性硬质聚氯乙烯复合材料的应用研究

经过改性的超细空心微珠可以作为填料加入到硬质聚氯乙烯（PVC－U）树脂中，同时改善PVC树脂的流变性、冲击性能和刚性等性能。研究结果表明，超细空心微珠加入到硬质PVC管材中，可以明显改善PVC硬管的加工流动性能，显著缩短塑化时间，降低最大扭矩。而超细空民微珠加入到硬质PVC板材时，可以提高PVC硬板的冲击性能，减小制品的收缩率，赋予PVC硬板优异的耐腐蚀性能，且产品的各项性能均符合PVC板材国家标准GB／T4454－96。     

核壳结构丙烯酸酯类聚合物的合成及性能研究

采用乳液聚合技术合成了硬聚氯乙烯（R－PVC）抗冲击改性剂丙烯酸酯类聚合物（ACR）。研究了ACR用量及合成参数对R－PVC冲击性能的影响。     

芯层发泡、内壁螺旋PVC-U排水管材及配件的研制

介绍了具有芯层发泡和内壁螺旋结构的用于建筑排水的硬聚氯乙烯（ＰＶＣ－Ｕ）管材及配件的成型加工技术和性能特点。     

纤维状硫酸钙填充改性硬聚氯乙烯的研究

本文是在采用工业副产品——纤维状硫酸钙作为硬聚氯乙烯填充剂的基础上,研究了该填充剂对硬聚氯乙烯性能的影响,以及EVA、CPE对硬聚氯乙烯/纤维状硫酸钙填充体系进行改性的效果。结果表明,纤维状硫酸钙综合性能优良;加入该改性剂后,填充体系的冲击强度和加工性能得到了明显改善;其它性能亦能满足使用要求。     

炭黑填充硬聚氯乙烯的改性

为使聚氯乙烯具有抗静电性能,采用加入具有导电性填料的方法,但加入大量的填料,会使硬聚氯乙烯的冲击性能降低,加工性能变差。本文是在以炭黑为填料的基础上,研究不同的改性剂和加工助剂改进硬聚氯乙烯的效果,结果表明,加入冲击改性剂和加工助剂后,大大增加了硬聚氯乙烯的冲击强度,且加工性能也得到改善,同时由于炭黑具有补强效果,其拉伸强度和弯曲强度在加入改性剂后也能满足使用要求。     

纳米氟改性防腐涂料

介绍了一种以环氧改性聚氯乙烯为基料的防腐涂料,为增强其防腐性能,在其中加入纳米氟微粒时对涂膜性能的影响,以及纳米氟微粒的添加工艺中的注意事项。     

浅析稳定剂对给水用硬聚氯乙烯（PVC-U）管材加工及其性能影响

硬聚氯乙烯（PVC-U）管材在我们生活中已经有几十年的应用，对人们生活发挥了重要作用。由于应用领域不同，硬聚氯乙烯（PVC-U）管材的品种也越来越丰富。由于产品性能要求不同，硬聚氯乙烯（PVC-U）管材的加工工艺配方也有很大区别。本文就不同稳定剂对给水用硬聚氯乙烯（PVC-U）管材加工及其性能影响进行分析，旨在让从事此类产品加工的同行对不同稳定剂给自己生产过程及产品性能造成的影响有所了解,少走弯路，避免造成不必要的损失。     

有机锡稳定剂在给水用硬聚氯乙烯管材中的使用标准研究

硬聚氯乙烯管材在我国众多领域都有着非常广泛的应用,管材的生产主要以PVC树脂为主,在实际生产过程中加入相应的添加剂,从而提升聚氯乙烯管材的综合性能。有机锡稳定剂在给水用硬聚氯乙烯管材中的应用是非常重要的,对有机锡的用量进行调节,聚氯乙烯材料的质量标准会得到很大的提升,使得管材的性能能够满足输水管道的实际需求。本文就是对有机锡稳定剂在给水用硬聚氯乙烯管材中的运用进行深入分析,希望对相关人员有所启示,促进我国聚氯乙烯生产行业不断发展。     

硬聚氯乙烯石墨塑料冷却器的应用动态

近年来,硬聚氯乙烯石墨塑料冷却器在一些化工厂正在推广试用,而且已经初步取得了较好的效果。硬聚氯乙烯石墨塑料是用聚氯乙烯树脂以石墨粉为填料,配以稳定剂经成型而得到的热塑性塑料。它既保持了普通硬聚氯乙烯塑料的化学稳定性、二次加工性能以及一定的物理机械强度,又增加了热传导和导电性能,从而为石油、化工、冶金、轻化工等工业,提供了一种新的热塑性塑料,扩大了聚氯乙烯塑料的应     

冲击改性剂对硬质PVC/木纤维性能影响

研究了冲击改性剂种类和添加量对硬质PVC/木纤维复合材料机械性能的影响。硬质PVC/木纤维复合材料的抗冲击性与冲击改性剂的种类和含量有关，当冲击改性剂的种类和浓度选择得当时，硬质PVC/木纤维复合材料既不降低拉伸强度，又可提高冲击韧性，MBS和ACR类改性剂在提高硬质PVC/木纤维复合材料的抗冲击性方面优于CPE。     

Effects of impact modifiers on the properties of rigid PVC/wood‐fiber composites

This study examined the effects of impact modifier types and addition levels on the mechanical properties of rigid PVC/wood‐fiber composites. The impact resistance of rigid PVC/wood‐fiber composites depends strongly on the type and content of impact modifier. With the proper choice of modifier type and concentration, the impact strength of rigid PVC/wood‐fiber composites can be significantly improved without degrading the tensile properties. Methacrylate‐butadiene‐styrene and all‐acrylic modifiers performed in a similar manner and were more effective and efficient in improving the impact resistance of rigid PVC/wood‐fiber composites than the chlorinated polyethylene modifier.     

CPE domain breakup in CPE/PVC blends

The proper morphology of the impact modifier in a polymer blend is important for the modifier to function properly. Well-dispersed particles of less than 1.0 micron in size are needed. For chlorinated polyethylene (CPE) in rigid PVC, this morphology is developed during normal extrusion conditions. The CPE coats the unmelted PVC primary particles, creating a network-like structure. Then, since CPE is at a low concentration (<5%), when the PVC melts, phase inversion occurs, giving discrete CPE particles in a continuous matrix of PVC. Further CPE domain breakup then occurs in the blend melt state, resulting in the desired morphology for impact modification.     

刚性粒子增韧聚氯乙烯的研究状况

详细论述了刚性粒子增韧聚氯乙烯的研究发展状况 ,探讨了刚性粒子的增韧机理。     

Studies on mechanical and rheological properties of poly(vinyl chloride) modified with elastomers and rigid organic particles

Chlorinated polypropylene (CPP) as rigid organic particles and chlorinated polyethylene (CPE) as elastomer were used to modify the properties of poly(vinyl chloride) (PVC) by melt blending. Both mechanical and rheological properties of the PVC blends were investigated. The submicroscopic morphology of the blends was observed by scanning electron microscopy (SEM) and transmission electron microscopy (TEM). The results demonstrate that when the weight ratio of CPE to CPP is about 6 : 1, a sample with the best impact strength and without obvious decline in tensile strength can be obtained. The impact strength correlates well with SEM morphologies, and TEM micrographs in the necking of the tensile specimen indicate that a cold‐drawing deformation of rigid particles happens as reported by T. Kurauchi and T. Ohta (J Mater Sci 1984, 19, 1699). Therefore, a conclusion can be drawn that CPP particles acting similar to elastic particles can toughen PVC, and the cold‐drawing deformation is the primary reason for toughening the PVC blends. In addition, the addition of CPP can promote the processibility of PVC ternary blends. © 2003 Wiley Periodicals, Inc. J Appl Polym Sci 88: 2478–2483, 2003     

刚性有机粒子对PVC／CPE共混体加工和力学性能的影响

本文用Ｂｒａｂｅｎｄｅｒ塑化仪，双锟开炼机研究了刚性有机粒子对ＰＶＣ／ＣＰＥ共混体熔融塑化为及力学性能的影响，探讨了不同加工温度对ＰＶＣ／ＣＰＥ共混体力学性能的影响，实验表明：添加少量刚性有机粒子后，体系的塑化时间缩短，塑化行为改善，韧性有较大幅度提高，拉伸强度有所改善，加工温度为１６０－１８０℃体系性能最好。     

Injection molding PVC

Injection molding rigid PVC is no longer the chore it once was. Advances in resin properties, additive systems, and molding equipment have allowed injection molders to take advantage of PVC's favorable economic, weatherability, flame retardant, and chemical resistant properties. As a result, injection molding of PVC is entering a new era. With the proper equipment and formulations, today's PVC molder is graduating from pipe fittings to ever more profitable, yet demanding, parts and applications.     

PVC powder extrusion. Melting properties and particle morphology

The extrusion of unplasticized PVC powder has been studied. Powder blends with low amounts of lubricants have been used in order to observe differences between structurally different PVC powders. Experiments with varying screw speeds indicate that resins consisting of agglomerated, small, globular primary particles are more sensitive to shear and deformation in the extruder channel than more compact particles. Frictional heat seems to be dissipated inside loosely agglomerated resin particles, possibly because of a larger internal surface. This additional heat, which depends on the shear rate, influences the melting behavior considerably. Scanning electron microscopy shows that PVC particles seem to melt without first breaking into smaller particles. A comparison between bulk-polymerized and suspension-polymerized PVC with nearly the same particle structure reveals a close similrity in melting properties. The results obtained in this work indicate that structural differences may explain the differences in melting behavior often observed when rigid PVC blends are extruded.     

紧密型聚氯乙烯硬管配方的流变性能研究

突破生产聚氯乙烯硬制品非采用疏松型聚氯乙烯不可的惯例,用美国哈克(HAAKE)EU-5型转矩流变仪,以紧密型聚氯乙烯为基料进行配方实验,采取加强稳定化和改善物料塑化流动性能等工艺措施,使以紧密型聚氯乙烯为基料配方的流变性能与采用疏松型聚氯乙烯为基料配方的流变性能基本一致,对生产中工艺配方的正确设计具有实际指导意义。     

CPE与ACR或MBS协同增韧硬质PVC研究

本文研究了ＰＶＣ／ＣＰＥ／ＡＣＲ或ＭＢＳ共混物的力学性能与增韧剂组成比、加工条件和相形态之间的关系。实验结果表明,适宜组成比和加工条件下,ＣＰＥ与ＡＣＲ或ＭＢＳ对硬质ＰＶＣ有协同增韧作用,共混物形态结构以增韧剂呈精细网－岛相分散为特征。