最高导热性的塑料开发成功

日本东し株式会社成功开发了世界上拥有最高导热性能的热塑性塑料。其导热性是其它塑料的100倍以上。利用这种具有高导热性能的热塑性塑料，制件内的热量会散发出去而不会积蓄。预计将应用在目前不使用塑料制品的多种应用场合。     

聚丙烯塑料合金的开发

介绍了使用热塑性弹性体（SBS），高密度取乙烯对聚丙烯进行共混挤出改性，得到性能优异的聚丙烯塑料合金，探讨了共混改性工艺及SBS用量对聚丙烯塑料合金性能的影响。     

功能性塑料的开发与应用

简要介绍了功能性塑料的开发和应用，重点介绍功能性塑料的国内外生产消费情况。并对国内功能性塑料的市场前景予以分析。     

纳米塑料的应用开发

介绍了功能性高分子／无机纳米复合材料的开发现状及其在提高阻隔性，阻燃性，耐摩擦及磨耗性和其他功能方面的应用实例。     

塑料光导纤维的开发与应用进展

介绍了塑料光导纤维的性能、制备、应用和现状与发展趋势。     

塑料助剂新品种的开发与应用

主要介绍了增塑剂、热稳定剂、光稳定剂、阻燃剂、抗氧剂、成核剂、抗菌剂、抗静电剂的开发、应用及发展趋势,并对国内塑料助剂生产企业的发展提出了建议。     

高比重陀螺油国内外研究概况

本文综述了近４０年来高比重陀螺油国内外研究概况，主要包括含氟高比重油，如氟氯油，氟溴油，氟溴酯油和多溴聚酯油等。最后还介绍了作者经多年研究，合成了一类比重２．３５￣２．５０，热稳定性，比温系数，粘温系数都优于现用陀螺油的新一代高比重陀螺油。     

抗菌塑料的开发应用

介绍了抗菌剂种类及其作用机遇。概述了国内外抗菌塑料的发展状况及其性能检测方法,并以PVC领域抗菌塑料为例,列举了几类抗菌应用实例。     

塑料格栅填料的开发与应用

介绍塑料格栅填料的特点，在易淤积的塔器中使用塑料格栅填料，可提高传质效率，降低运行阻力。塑料格栅填料是一种高效、低阻力、大通量的规整填料。     

Development and processing of flame retardant cellulose acetate compounds for foaming applications

Cellulose acetate (CA) is a bio-based polymeric material suitable to replace foamed polystyrene (PS) boards in applications for building insulation. Foam boards can be produced by extrusion foaming with physical blowing agents. In addition, the high heat deflection temperature and good mechanical properties (e.g., tensile and compression strength) of CA make it suitable for the injection molding of technical parts. In general, flame retardancy of foamed products is often required in building or electronic applications. This article presents the effects of various flame retardant (FR) additives, process settings, and the calibration of the foam board on flammability, foam morphology, and mechanical properties of extruded CA boards. Different formulations of FR additives and foaming agents were investigated regarding density and morphology of the foamed boards. Furthermore, investigations on foam behavior for foam injection molding with physical blowing agents were conducted. The foamed parts were characterized with regard to their flammability. © 2019 The Authors. Journal of Applied Polymer Science published by Wiley Periodicals, Inc. J. Appl. Polym. Sci. 2020 , 137, 48863.     

多级雾化超重力旋转填料床的特性及应用

介绍了超重力旋转填料床的结构、特性和工业应用情况。华南理工大学对自主开发的错流型多级雾化超重力旋转填料床进行了结构、液滴运动、气液传质和流体力学、能耗等特性的试验研究。目前,该设备已应用于燃油烟气脱硫中,最大处理气量达5×10~4m~3/h,与传统填料塔相比,具有气体压力降低、传质效率高、体积紧凑、质量轻、投资省等优点。超重力技术在烟气脱硫、除尘方面有着良好的应用前景。     

Development and scale-up of thermoplastic poly(ether-ester) glycol polyurethanes for flexography

This study presents an experimental essay on the production of thermoplastic polyurethanes for flexographic printing ink applications. Four formulations were obtained by step-growth polymerization reactions having the pre-polymer 4,4′-diphenylmethylene diisocyanate and Voranol 2120 L® catalyzed by dibutyltin dilaurate as common ground. In the chain extension step, ethanol or ethyl acetate was used as solvent, and the use or not of castor oil as a chain extender in addition to hexanedioic acid and 2,2′-oxydi(ethan-1-ol) was evaluated. The chemical structures of the synthesized thermoplastic polyurethanes (TPUs) were evaluated by Fourier transform infrared spectroscopy, ¹H NMR, gel permeation chromatography, differential scanning calorimetry, and rheological features were assessed by density and viscosity analysis. The TPU resins were used to produce flexographic printing inks and further tested by friction, adhesion, gloss, and Gardner viscosity essays. It was found that the castor oil presence enhanced ink viscosity in 66% (from 26,790 to 44,440 Pa s) as well as improved strength. Formulations using ethanol as solvent showed the best results. The experiments were carried in a 250 ml reactor and then, scaled up to 2000 ml, keeping the power transfer per unit of volume constant at around 0.8 W/L. The analytical results from the larger scale were as good as the obtained in scale one, showing promising application.     

Rheology of natural fibers thermoplastic compounds: Flow length and fiber distribution

The presented study investigates the flow length and the corresponding fiber content distribution in the injection‐moulded natural fiber reinforced thermoplastics and its relation to fiber type and processing parameters such as injection pressure, temperature, injection rate and mould tempering by increasing die temperature. In this research, polypropylene compounds with nominally 30 wt % hemp and sisal fibers are investigated. The influence of the injection pressure (500 and 1000 bar), melt temperature (180°C, 200°C, and 220°C), and die temperature (23°C and 80°C) on the fiber content distribution all over the sample is investigated. An increasing linear trend of fiber content along the spiral length is observed as an evidence of a fiber/polymer multiflow system. A pattern for fiber content distribution with respect to the fiber length along the injected spiral can be distinguished, where the longer fibers are usually found at the end of the injected part and the shorter fibers remain near mould entrance point. © 2013 Wiley Periodicals, Inc. J. Appl. Polym. Sci. 2014 , 131, 39861.     

沥青改性用SBS市场分析及生产开发建议

通过对国内外苯乙烯类热塑性弹性体SBS产品在制鞋、沥青改性、聚合物改性和粘合剂等方面的市场及消费需求分析,预测了SBS产品在改性沥青行业的需求情况和发展趋势。随着国内高等级高速公路的快速发展,我国对改性沥青用SBS的需求量将会有较大的增长。针对我国目前的生产实际情况,提出了下一步改性沥青用SBS的生产开发建议。     

Mold replication in injection molding of high density polyethylene

In order to deepen the mechanisms at the basis of mold surface replication onto the molded plastic surface, a novel experimental approach is proposed. Up to 20 different mold surface textures were made by machining with repetitive patterns of peaks and valleys. Mold replication tests were performed by over-molding of high density polyethylene (HDPE) on steel inserts. The surface morphology of inserts and injection molded parts was acquired by surface analyzer, and all the main roughness parameters were extracted and compared as well as the geometrical profiles. Surface morphology was also measured on molded samples after thermal relaxation at 100°C. As expected, a strong correlation was found between the roughness of mold insert and molded part over the full experimented range. Profiles on the molded surface have the same repetitive pattern of the corresponding insert surface but with lower peaks, higher valleys, and a horizontal shrinkage. Comparing molded HDPE surface profiles before and after thermal relaxation, it was observed a similar change to the one highlighted between mold insert and molded part. This occurrence suggests that the final surface appearance of the molded part is also a function of the relaxation mechanism during or immediately after injection molding.     

Preparations and properties of a high performance semicrystalline copolyimide and composites reinforced with glass fiber

A semicrystalline copolyimide derived from 3,3′,4,4′‐biphenyltetracarboxylic dianhydride (s‐BPDA), 1,3‐bis‐(4‐aminophenoxy)benzene (TPER), and 4,4′‐oxydianiline (4,4′‐ODA), end capped with phthalic anhydride (PA), was synthesized. Glass fiber reinforced composite was also prepared by impregnating powdery glass fiber with poly(amic acid) followed by solution imidization techniques. This copolyimide displayed a glass transition temperature of 202°C and a melting temperature of 373°C by differential scanning colorimeter (DSC). Crystallization and melting behaviors were investigated under nonisothermal and isothermal crystallization conditions. Double exothermic peaks were found by DSC when the copolyimide was cooled from the melt and multiple melting behaviors can be observed after the coployimide had been isothermally crystallized at different temperatures. Mechanical properties were investigated by dynamical mechanical analysis (DMA) and tensile experiments. The samples were cured at different temperatures and then tested at different temperatures. Results indicated that the copolyimide and the composite showed excellent mechanical properties. Additionally, this copolyimide also showed lower melt viscosity by rheological analysis. © 2014 Wiley Periodicals, Inc. J. Appl. Polym. Sci. 2014 , 131, 40345.     

高铝-尖晶石-炭不烧水口砖的研制及应用

以高铝矾土熟料、烧结合成镁铝尖晶石砂为主要原料，加入5％～10％鳞片状石墨，外加6％甲阶酚醛树脂为结合剂，可制得气孔率低、体积密度高、强度大、抗热震、耐侵蚀的高铝－尖晶石－炭质不烧水口砖。     

SSBR在高性能轮胎胶料中的应用

考察了乳聚丁苯橡胶SBR1712、溶聚丁苯橡胶Buna VSL 5025—1、JSRT5800和JSRSL563与天然橡胶（NR）并用硫化胶的物理机械性能和动态力学性能。结果表明，NR／JSR T5800并用胶在满足轮胎基本物性下，其压缩生热最小、抗湿滑性最好、滚动阻力最小，能够有效地解决轮胎胎面胶滚动阻力和抗湿滑性之间的矛盾，满足高性能轮胎发展的需要。     

Thermomechanical devulcanization of ethylene propylene diene monomer rubber and its application in blends with high-density polyethylene

The recycling of ethylene propylene diene monomer (EPDM) rubber remains a challenge, as its cross-linked structure cannot be broken down reversibly. Devulcanization may offer a breakthrough; however, a 100% decrease in cross-link density (CLD) with no chain degradation has never been reported. In this research, sulfur- and peroxide-cured EPDM rubbers of known compositions were devulcanized on a two-roll mill and in an internal mixer. The CLD of both rubber samples decreased by around 85%, while the sol content of the peroxidic devulcanizate was considerably higher than that of the sulfuric devulcanizate (23% vs. 3%). Horikx's theory revealed that sulfur-cured samples showed excellent selectivity for cross-link scission, while peroxide-cured samples suffered degradation. Uncured, cured, and devulcanized rubber samples were mixed into high-density polyethylene at various compositions. Large EPDM rubber contents impaired the mechanical properties of the blends, indicating insufficient adhesion between the two phases. Compounds containing originally uncured rubber mixtures had the most beneficial mechanical properties.