聚苯乙烯

Numerical simulation results show that the fluid flow in Lost Foam Process was different from that in an ordinary green sand mold, the molten metal flow forwards in a circular-arc shape from the ingate, meanwhile, the nature of the gating system influenced the filling process notably. As the polystyrene pattern decomposition has a strong quenching effect on the flowing metal fornt, a high temperature gradient was formed at the flowing metal front, this resulted in the dropping of temperature of the metal to the liquidus temperature quickly and decreased the flowability of molten metal, the temperature distribution in the metal behind, however, was even. The properties of the pattern and the coating affected the temperature distribution remarkably.

从内浇口开始，金属液呈放射状均匀向前充填，同时浇注系统性质显著影响金属液充型过程的流场；由于聚苯乙烯模样气化吸热对金属液的激冷作用，在金属液流端部区域产生很大的温度梯度，使得端部区域金属液很快降至液相线温度，降低了金属液的充型能力，而后续金属液中温度分布则比较均匀，模样性能、涂料性能显著影响这一温度分布特点。

The company is specializing in the production of extruded polystyrene foam insulation board with production enterprises.

公司是专业生产绝热用挤塑聚苯乙烯泡沫塑料板生产企业。

Polystyrene board insulation on the external walls of the material systems are often difficult to meet this requirement.

聚苯乙烯对材料系统的保温外墙板往往难以满足这一要求。

Rules-based HIPS intrusively and explicitly regulate what any particular application or operating system component may or may not do.

规则为基础的高抗冲聚苯乙烯干扰，并明确规定任何特定的什么应用程序或操作系统组件可以或不可以做。

A selective and mild PS-DIB/ionic-liquid immobilized 2, 2, 6, 6-tetramethyl-piperidin-4-ol-N-oxyl catalytic oxidation procedure of alcohols to the corresponding aldehydes and ketones in ionic liquid BF4 at room temperature was developed. The oxidant PS-DIB was prepared via the iodation and acetylation of polystyrene resin. For the preparation of the ionic-liquid immobilized TeMPO catalyst, 4-(2, 2, 6, 6-Tetramethyl-1-oxyl-4-piperidoxyl)butyl bromide was first synthesized from TeMPO and 1, 4-dibromobutane.

将聚苯乙烯树脂先碘化再乙酰基化，制得了负载型二乙酰氧碘苯作为氧化剂。2， 2， 6， 6-四甲基－N-氧自由基哌啶醇与1， 4-二溴丁烷反应生成4-溴丁氧基－2， 2， 6， 6-四甲基－哌啶－1-氧化物，再与N-甲基咪唑发生季铵化反应，生成的溴化季铵盐与四氟硼酸钠进行离子交换制得氟硼酸型2， 2， 6， 6-四甲基－N-氧自由基哌啶负载离子液体。

A selective and mild PS-DIB/ionic-liquid immobilized TEMPO catalytic oxidation procedure of alcohols to the corresponding aldehydes and ketones in ionic liquid BF4 at room temperature was developed. The oxidant PS-DIB was prepared via Iodation and acetylation of polystyrene resin. For the preparation of the ionic-liquid immobilized TEMPO catalyst, 4-(2,2,6,6-Tetramethyl-1-oxyl-4-piperidoxyl)butyl bromide was first synthesized from 2,2,6,6-tetramethyl-piperidin-4-ol-N-oxyl and 1,4-dibromobutane.

将聚苯乙烯树脂先碘化再乙酰基化，制得了负载型二乙酰氧碘苯(diacetoxyiodo polystyrene，PS-DIB)作为氧化剂。2，2，6，6-四甲基-N-氧自由基哌啶醇(2，2，6，6-tetramethyl-piperidin-4-ol-N-oxyl，TEMPO)与1，4-二溴丁烷反应生成4-溴丁氧基-2，2，6，6-四甲基-哌啶-1-氧化物，再与N-甲基咪唑发生季铵化反应，生成的溴化季铵盐与四氟硼酸钠进行离子交换制得氟硼酸型2，2，6，6-四甲基-N-氧自由基哌啶负载离子液体TEMPO-IL。

Effects of novolac resinand micro-capsulated red phosphoruson inflaming retarding property of high impact polystyrenewere investigated by means of cone calorimeter,limiting oxygen indexand UL94 vertical combustion test.

采用锥形量热仪、极限氧指数和UL94垂直燃烧测试方法研究了微胶囊红磷和酚醛环氧树脂对高抗冲聚苯乙烯阻燃性能的影响。

The method can avoid the use of toxic substances of chloromethyl ether, etc. during the preparation process of methyl chloride polystyrene resin, and also improves the polysubstitution in chloromethylation reaction.

该方法既可避免在氯甲基聚苯乙烯树脂制备过程中使用氯甲醚之类的有毒物质，又改善了氯甲基化反应中的多取代。

The mineralogy and the physicochemical properties of attapulgite were study by means of SEM, XRD, and FTIR.

研究了复合材料的力学性能和流变性能，并与纯聚苯乙烯的性能进行了对比。

HIPS MA5210 manufactured by Chevron Phillips Chemical Company LP is of good moldability and good mold release property, which are recommended to produce high impact, hardness and high gloss appearance parts especially for molding of TV, air conditioner, refrigerator, computer, house and office wares.

雪佛龙 -菲利普斯 MB5210 高抗冲聚苯乙烯具有良好的注塑加工性能，良好的脱模性，用其注塑加工的制品具有优良的刚性和韧性，并具有高表面光泽度，不喷涂的产品具有良好的外观质量，该牌号产品广泛用于空调、冰箱和计算机的部件及家庭用品和办公用品等。

Singer Leona Lewis and former Led Zeppelin guitarist Jimmy Page emerged as the bus transformed into a grass-covered carnival float, and the pair combined for a rendition of "Whole Lotta Love".

歌手leona刘易斯和前率领的飞艇的吉他手吉米页出现巴士转化为基层所涵盖的嘉年华花车，和一双合并为一移交&整个lotta爱&。

This is Kate, and that's Erin.

这是凯特，那个是爱朗。