喷雾干燥法再生PS树脂工艺研究

采用溶解 喷雾干燥法对废旧聚苯乙烯泡沫塑料进行回收利用研究。介绍溶解 喷雾干燥回收利用的方法、工艺流程及试验结果。试验结果表明，采用该工艺回收利用废旧聚苯乙烯泡沫塑料是可行的，制得的粉状ＰＳ树脂性能优异，是一种回收利用废旧聚苯乙烯泡沫塑料的新工艺     

废旧聚苯乙烯泡沫塑料的开发利用

综述废旧聚苯乙烯泡沫塑料的回收再生利用技术。     

机械摩擦熔融固化法回收废旧聚苯乙烯泡沫塑料

简要叙述废旧聚苯乙烯(PS)泡沫塑料回收的必要性和迫切性,分析了废弃PS泡沫塑料的特点;对国内外处理方法和回收技术进行比较;还重点介绍了机械摩擦熔融固化法回收废旧PS泡沫塑料的工艺、设备、产品应用及效益。     

废旧聚苯乙烯泡沫塑料的综合利用技术

本文综述了废旧聚苯乙烯泡沫塑料的回收再生利用技术。     

改性PS功能涂料及粘接剂的研究

本文对一次性使用的废旧聚苯乙烯泡沫塑料回收利用进行了较系统的研究,探索出一种简易的混合溶剂溶解法综合利用废聚苯乙烯泡沫塑料。并在实验室研制出改性PS功能涂料和粘接剂。     

废旧聚苯乙烯泡沫塑料的回收利用

本文引用近年来的文献资料对废旧聚苯乙烯泡沫塑料（ＰＳＦ）的回收利用技术及其进展情况进行了综合评述，并对回收利用技术作了简单的分析讨论。     

废旧聚苯乙烯树脂（PS）的乳化及应用

通过对废旧聚苯乙烯泡沫塑料进行溶解、乳化研究，获得稳定的聚苯乙烯乳液。再添加助剂后可制成各种用途的涂料、纸箱光亮防潮剂等产品。为将污染环境的废旧聚苯乙稀泡沫塑料转化为有用的产品提供了一种有效途径。     

聚苯乙烯溶液接枝改性研究

用溶液接枝的方法研究了回收的废聚苯乙烯泡沫塑料的接枝工艺，包括引发剂的用量、反应温度、单体浓度、单体种类、多单体共接枝对废聚苯乙烯泡沫塑料接枝的影响。PS接枝工艺的研究结果为废聚苯乙烯泡沫塑料的再利用提供了理论依据。     

废旧聚苯乙烯泡沫的回收利用——制路标涂料

采用乙酸乙酯、二甲苯、环己酮为混合溶剂,对废旧聚苯乙烯泡沫进行溶解,作为溶剂型道路标线涂料的基料之一。通过对混合溶剂作正交试验,得到混合溶剂的最佳配比。并对聚苯乙烯溶液、丙烯酸树脂、填料和助剂作正交试验,得到溶剂型道路标线涂料的最佳配方。废旧聚苯乙烯泡沫塑料应用到道路标线涂料中,起到对溶剂型道路标线涂料进行改性的目的,又起到废品回收利用的目的。     

废聚苯乙烯泡沫塑料回收制备涂料的研究

从理论和实践上介绍了多种回收聚苯乙烯泡沫塑料制备涂料的方法及应用范围,并对未来合理利用聚苯乙烯泡沫塑料提出了建议。     

Ultrahigh compressive strength and heat resistance of polystyrene/polyphenylene oxide foams of supercritical carbon dioxide foaming

Polystyrene (PS) foam materials are lightweight, but suffer from poor compressive strength and heat resistance, among other problems, which limit their application. Herein, a method for preparing PS foam with high compressive strength and high heat resistance using supercritical CO₂ is proposed. PS/polyphenylene oxide (PPO) blends were prepared using a corotating intermeshing twin-screw extruder. The results showed that PPO exhibited excellent molecular-level compatibility with PS, which substantially improved mechanical properties and heat resistance of PS. Foam samples of PS/PPO blends with the same expansion ratio were prepared via batch foaming experiments, and the compressive strength of different foams was determined at different temperatures. At room temperature, the compressive strength of the PS/PPO-30% foam increased by 173% compared with pure PS foam. As the testing temperature increased from 30 to 120°C, the compressive strength of pure PS foams decreased rapidly. Nevertheless, PS/PPO foams maintained high compressive strength at high temperatures.     

Smart polymer recycling: Synthesis of novel rigid polyurethanes using phosphorus‐containing oligomers formed by controlled degradation of microporous polyurethane elastomer

This article describes a new approach for the recycling of microporous polyurethane elastomers by Tris(1‐methyl‐2‐chloroethyl) phosphate‐induced degradation. The phosphorus‐containing degradation products formed are transformed into reactive intermediates by reaction with propylene oxide and are used for the preparation of rigid polyurethane foams. These new phosphorus‐containing materials have higher density and better mechanical properties compared to the standard rigid polyurethane foams. © 2007 Wiley Periodicals, Inc. J Appl Polym Sci 2007     

Preparation and properties of multi-walled carbon nanotube/carbon/polystyrene composites

Multi-walled carbon nanotube (MWCNT)/C/polystyrene (PS) composite materials were prepared by in situ polymerization of monomer in preformed MWCNT/C foams. MWCNT/C foams were preformed using polyurethane foam as template. The preformed MWCNT/C foams had a more continuous conductive structure than the carbon nanotube networks formed by free assembly in composites. The structure of the MWCNT/C foam network was characterized with scanning electron microscopy. The MWCNT/C/PS composites have an electric conductivity higher than 0.01 S/cm for a filler loading of 1 wt.%. Enhancement of thermal conductivity and mechanical properties by the preformed MWCNT/C foam were also observed.     

Foaming of PS/wood fiber composites using moisture as a blowing agent

This paper presents an experimental study on foam processing of polystyrene (PS) and high‐impact polystyrene HIPS/wood‐fiber composites in extrusion using moisture as a blowing agent. Wood‐fiber inherently contains moisture that can potentially be used as a blowing agent. Undried wood‐fiber was processed together with PS and HIPS materials in extrusion and wood‐fiber composite foams were produced. The cellular morphology and volume expansion ratios of the foamed composites were characterized. Because of the high stiffness of styrenic materials, moisture condensation during cooling after expansion at high temperature did not cause much contraction of the foamed composite and a high volume expansion ratio up to 20 was successfully obtained. The experimental results showed that the expansion ratio could be controlled by varying the processing temperature and the moisture content in the wood fiber. The effects of a small amount of a chemical blowing agent and mineral oil on the cell morphologies of plastic/wood‐fiber composite foams were also investigated.     

Glycolysis of Waste Polyurethane Integral Skin Foams from Steering Wheel

As polyurethane integral skin foams are widely used in the automotive industry, in order to decrease the amount of waste disposal of these foams, chemical recycling is preferred as a useful method to achieve both targets: 1) making the industry more compatible with the environment, and 2) defining an economic progress. In this research it has been tried to reconvert integral skin PUF to raw materials by glycolysis. A mixture of diethylene glycol and diethanol amine was used as a solvent system. The product's specifications were analyzed and an amount of recycled polyol usable in foam formulation was adjusted.     

The preparation and properties of polystyrene/functionalized graphene nanocomposite foams using supercritical carbon dioxide

In this work, polystyrene (PS)/functionalized graphene nanocomposite foams were prepared using supercritical carbon dioxide. Thermally reduced graphene oxide (TRG) and graphene oxide (GO) were incorporated into the PS. Subsequently, the nanocomposites were foamed with supercritical CO₂. The morphology and properties of the nanocomposites and the nucleation efficiency of functionalized graphene in foaming PS are discussed. Compared with GO, TRG exhibited a higher nucleation efficiency and more effective cell expansion inhibition thanks to its larger surface area and better exfoliated structure. It is suggested that the factors that have a significant influence on the nucleation efficiency of TRG and GO originate from the differences in surface properties and chemical structure. Furthermore, PS/TRG nanocomposites and their nanocomposite foams also possess good electrical properties which enable them to be used as lightweight functional materials.© 2012 Society of Chemical Industry     

Thermal and mechanical properties of microcellular thermoplastic SBS/PS/SBR blend: effect of crosslinking

This study investigates the effect of peroxide crosslinking on the structure and mechanical properties for SBS/PS/SBR foams composed of polystyrene (PS), poly(styrene-b-butadiene) diblock copolymer (SBR-1502), and poly(styrene-b-butadiene-b-styrene) triblock copolymer (SBS). The cell size and its distribution of SBS/PS/SBR foams were investigated by SEM images, showing the smaller and denser of hollow cells for the SBS/PS/SBR foam containing the higher concentration of DCP (dicumyl peroxide). As expected, the density of the SBS/PS/SBR foams increases with increasing the content of DCP. The high density of polymeric foams exhibits the high mechanical properties such as hardness, shrinkage, tensile strength, tear strength, elongation at break, and compression set.     

浓乳液模板法制备导电聚苯乙烯泡沫材料

以两亲性导电聚合物聚(3,4-乙烯二氧噻吩)-聚苯乙磺酸（PEDOT/PSS）作为表面活性剂,碳纳米管为导电填料,通过浓乳液模板法制备了聚苯乙烯导电泡沫复合材料（PS-MWCNTs）。用扫描电镜观察了不同碳纳米管负载量对材料泡孔形貌的影响,并通过导电性能测试研究了材料的电导率随碳纳米管及导电表面活性剂含量的变化规律。结果表明,填料负载量可以影响泡沫材料的泡孔形态与导电性能,并且具有表面活性剂性能的导电聚合物的引入大大提高了PS-MWCNTs泡沫材料的导电性。     

发泡母粒对ABS发泡材料泡孔结构及力学性能的影响

采用化学注塑发泡制备了丙烯腈–丁二烯–苯乙烯(ABS)发泡材料,研究发泡剂母粒载体分别为高抗冲聚苯乙烯(PS–HI),PS–HI+苯乙烯–丁二烯–苯乙烯塑料(SBS),SBS,ABS及聚烯烃弹性体(POE)时发泡剂母粒对ABS泡孔结构及力学性能的影响。结果表明,发泡母粒载体对ABS发泡试样的泡孔结构及力学性能具有较大的影响,以POE为发泡母粒载体所制得的ABS发泡样品的泡孔结构、力学性能较好。其泡孔平均直径为18.5μm,泡孔密度为4.183×107个／cm3,冲击强度为11.7 kJ／m2,拉伸强度为30.8 MPa。     

Recycling polymeric wastes by means of pyrolysis

Different polymeric wastes, which include materials from the automobile industry, such as tyres, automobile shredder residues (ASR) and sheet moulding compound (SMC), and materials from municipal solid wastes (MSW), such as cardboard, tetrabrik and plastics (LDPE, PP, PS, PET and PVC), pure and mixed, have been pyrolysed in a 3.5 dm³ autoclave at 500 °C for 30 min in a nitrogen atmosphere. The amount and characteristics of the solid, liquids and gases obtained are presented. The suitability of the different materials for the pyrolysis recycling process is discussed. It is concluded that pyrolysis is a very promising technique for recycling tyres, SMC, one type of ASR (heavy ASR), and LDPE, PP and PS, either pure or mixed; with all of them valuable solid, liquid and gaseous products are obtained in pyrolysis. On the contrary, light ASR, tetrabrik and cardboard do not yield valuable products in the pyrolysis process and therefore their recycling by pyrolysis is not of interest, except as a way of volume reduction. PET and PVC turned out to be troublesome in the pyrolysis experiments; for a proper study of their recycling by pyrolysis other operating conditions and installations are required. © 2002 Society of Chemical Industry