投资上线

天津投巨资建设新型建材基地，宁夏3项目获国债扶持，西南最大石膏生产线建成投产，国内首套挤塑发泡保温板材生产线青岛投产，钢丝网架聚苯乙烯夹芯板生产线落户聊城[编者按]     

屋面球场用料选择及施工工艺的探讨

目前，屋面的利用越来越广泛，如在屋面上做花园，利用屋面做休闲场所，运动场所等，这样的屋面都涉及到防水，保温隔热以及装饰等方面的问题，本文重点讨论屋面运动场的使用功能对所用材料性能的要求及施工工艺的要求。     

疲劳/蠕变复合作用下聚苯乙烯的交互损伤研究

探讨了在疲劳／蠕变复合作用下聚苯乙烯的损伤交互作用，结果表明，在疲劳／蠕变复合作用下聚苯乙烯存在疲劳和蠕变的交互损伤，其断裂寿命比纯疲劳或纯蠕变的断裂寿命低；断裂机制是疲劳循环载荷松动和活化了分子链或链段，从而促进蠕变运动和断裂，并且，疲劳／蠕变的交互损伤程度与温度密切相关。     

In—situ Composite Based on Poly （ethylene terephthalate）,Polyamide and Polyethylene with Microfibres Formed through Extrusion and Hot Stretching

In-situ composites based on dispersed poly (ethylene terephthalate) (PET) or polyamide (PA),and continuous Polyethylene (PE) were prepared through a single screw extruder of Haake rheometer system with a rod-die relatively small in diameter.The extrudate was drawn at a drawing ratio of 3.1,and then quickly cooled in cold water.The specimens were obtained by injection molding at processing temperatures less than 190℃，far below the melting temperature of PET (265℃) and PA (230℃),which can maintain the solid state of PET and PA microfiber phase in the composites.Morphological observation with scanning electron microscopy (SEM) indicated that PET and PA can more or less form in-situ microfibers at compositions studied (0-20 wt pct PET or PA),and especially,PET and PA were almost deformed into fibers at the concentration of 15wt pct.Eensile strength and especially.PET and PA were almost deformed into fibers at the concentration of 15wt pct.Tensile strength and modulus of the blends reinforced by PET or PA microfibers showed to be increased from the tensile test results.The most noticeable improvement of the tensile properties occurred at 15wt pct of PET in PET/PE system,corresponding to the highest microfiber content,where the tensile strength reached 32.5 MPa,whereas only 19.5 MPa for the pure PE.     

阻燃高冲击度强度聚苯乙烯（HIPS）

本文叙述ＨＩＰＳ用阻燃剂的特点，十多种阻燃ＨＩＰＳ的配方及性能．文中讨论的阻燃剂有十溴二苯醚、１，２－双（四溴邻苯二甲酰亚胺）乙烷、四溴双酚Ａ、Ｓａｙｔｅｘ８０１０①及得克隆（Ｄｅｃｈｌｏｒａｎｅ）Ｐｌｕｓ．     

负压实型铸造工艺的研究

介绍了负压实型铸造工艺所用原材料和铸造工艺特点。铸型硬度应大于９０（湿型硬度计），真空度应大于２６６６０Ｐａ，浇注温度应比普通砂型铸造高２０～３０℃，金属液面适宜的上升速度是３～５ｃｍ／ｓ；造型时模样的摆放应使侧面积最大，有内孔铸件应使开口朝上，内浇口的截面积应比普通砂型铸造大２０～３０％。还分析了负压实型铸造中铸件易产生的缺陷及防止方法。     

聚苯乙烯泡沫塑料板在三清干渠改建工程中的试验

高台县友联灌区三清干渠地处严寒地区，且渠道沿线地质条件较差，影响渠道衬砌改建质量的关键技术问题是防冻胀设计。由于三清干渠附近缺乏垫层料，采用垫层置换防冻胀投资高，且垫层质量难以控制。设计人员根据有关规范要求．结合渠线地质条件．采用聚苯乙烯泡沫塑料保温板进行防冻胀试验，较好地解决了冻胀问题。