聚苯乙烯

"Common plastics include polyethylene terephthalate, or PET, PVC, foamed polystyrene, or Styrofoam, and Lucite."

普通的塑料包括聚对苯二甲酸乙二醇酯或PET、聚氯乙烯、起泡沫的聚苯乙烯、或聚苯乙烯泡沫塑料和卢西特。

"Common plastics include polyethylene terephthalate, or PET, PVC, foam ed polystyrene, or Styro foam, and Lucite."

普通的塑料包括聚对苯二甲酸乙二醇酯或PET、聚氯乙烯、起泡沫的聚苯乙烯、或聚苯乙烯泡沫塑料和卢西特。

Halogen acetylized crosslinked polystyrene resin is used for replacing commonly used methyl chloride polystyrene resin.

用卤乙酰化聚苯乙烯树脂代替了通常所用的氯甲基聚苯乙烯树脂。

It is to say that the patch of RAFT agent on the hairy chains.PS particles with the shell of copolymer of styrene and vinylbenzyl chloride were prepared by similar seeded and starved addition processes. RAFT agent with carboxyl end-group attached on the shell surface of PS particles by group reaction. Adding NIPA and photo-initiator into the continuous phase of polymerization system, hairy PNIPA were obtained.

最后，以表面负载一层乙烯基苄氯的亚微米级单分散聚苯乙烯微球为基质，将水溶性RAFT试剂与聚苯乙烯微球表面的官能团反应以负载到其表面，再在连续相中直接引入NIPA和光引发剂，RAFT聚合得到PNIPA毛发。

The importance of studying shrinking of polystyrene pattern for evaporative pattern casting is pointed out in this paper.After studying effects of technological factorsexpandable polystyrene(EPSbead diameter,pre-expansion time,age time of pre-expansion bead,molding steam pressure,storage time and temperature of pattern on shrinking of pattern,it is shown that the stress relaxation of pattern and the escape of pentane and water in pattern are main cause of pattern shrinking.

指出了对消失模铸造用聚苯乙烯模样收缩展开研究的必要性，研究了可发性聚苯乙烯珠粒粒径、预发泡时间、预发泡珠粒熟化时间、成形蒸汽压力及模样的放置时间、贮存温度对模样收缩的影响，认为模样中发泡剂和水分的挥发以及应力的释放是引起模样收缩的主要原因，最后提出了在实际生产中为减少模样收缩应采取的措施。

The most parts of thesis as follows:1. Five symmetrical intra-molecular charge transfer oligomeric phenylene vinylene light emitting materials were designed and synthesized using oligomeric phenylene vinylene as a framework.2. The structures of target molecule were characterized by ~1HNMR,~(13)CNMR, IR, MS and element analysis.3. In order to study the influence of the location and numbers of electron-donor and electron-acceptor on their photoelectric performance by changing length of OPV chain, the UV spectra and fluorescence spectra of target compounds has been compared. We have researched into main factors effecting on material emitting red-shift; organic electroluminescence device was prepared using the compound P4. The capability of eletroluminescence was researched.4. The photoelectric properties of P4 was explained by quantum chemical calculation (the Gaussian 98 quantum chemistry program). It is greatly contributed know the whole process of charge transfer to guide the design of red emitters.

本文研究的内容主要包括以下部分：(1)设计并合成5个对称的以齐聚苯乙烯类为骨架的分子内电荷转移型齐聚苯乙烯类发光材料；(2)通过IR，MS，~1H-NMR，~(13)C-NMR和元素分析对所合成的目标化合物进行表征；(3)通过对目标化合物的紫外光谱和荧光光谱比较分析，研究改变OPV的长度，电子给体和电子受体的位置及数量对其光电性能的影响，探讨材料发射红移的主要因素；选取性能良好的目标化合物P4制备成OELD器件，对其电致发光性能进行研究；(4)运用Gaussian98量子化学程序包，采用量子化学方法对目标化合物P4的光电性能从理论加以解释，进一步认识荷移跃迁的整个过程，为红光材料的设计加以指导。

The test showed that the vegetable oil was better for plasticization of polystyrene.

结果 表明植物油对聚苯乙烯具有良好的增塑性，采用乙酸乙酯、乙酸乙酯和甲苯两种体系的溶剂进行溶解制备包膜肥料，除A1外，其他5种肥料初期溶出率均低于40%，可以确认用此两种体系溶剂溶解聚苯乙烯皆可行，混合溶剂体系的效果更好些。

Nevertheless they may, through the temptations of Satan and the world, the prevalency of corruption remaining in them, and the neglect of the means of their preservation, fall into grievous sins; Mt 26:70,72,74 and for time continue in them: Ps 51:1,14 whereby they incur God's displeasure, Isa 64:5,7,9 2Sa 11:27 and grieve his Holy Spirit; Eph 4:30 come to be deprived of some measure of their graces and comforts; Ps 51:8,10,12 Re 2:4 So 5:2-4,6 have their hearts hardened, Isa 63:17 Mr 6:52 16:14 and their consciences wounded; Ps 32:3,4 51:8 hurt and scandalise others, 2Sa 12:14 and bring temporal judgments upon themselves.

Ps 89：31，32 1Co 11：32 3 ），但他们可以通过种种诱惑，撒旦和全世界来说， prevalency腐败的留在他们，而忽略了手段加以保存，落入他人的罪过；吨26：70，72，74和时间继续在他们：聚苯乙烯51：1，14让他们蒙受上帝的不悦，伊萨64：5，7，9 2sa 11：27和悲伤，他的圣灵；弗4：30来被剥夺了一些措施，他们的青睐和舒适；聚苯乙烯51：8，10，12重2时04分，使5：2-4，6有他们的心硬化，伊萨63：17先生6时52分16时14分和他们的良知受伤；常任32：3，4 51：8伤害和scandalise他人， 2sa 12：14和造就颞判断自己。

Firstly, Polystyrene-supported benzyl selenide has been prepared from 1% cross-linked polystyrene resin.

一、以1%交联的聚苯乙烯为载体，首次合成了聚苯乙烯负载的苄基硒醚。

This is a reasonable method to investigate real polymer systems. The semiflexible model can capture the main features of aPS, and can semi-quantitatively describe the intermolecular correlation function, intramolecular correlation function, solubility parameters and x-ray scattering intensity for real aPS melt.

该模型能够抓住复杂的无规聚苯乙烯熔体的主要结构信息，可以半定量的描述各种条件下无规聚苯乙烯熔体的分子间相关函数、分子内相关函数、溶解度参数和x-光散射强度等结构和热力学性质，并得到了MD数据和实验数据的支持。

The split between the two groups can hardly be papered over.

这两个团体间的分歧难以掩饰。

This approach not only encourages a greater number of responses, but minimizes the likelihood of stale groupthink.

这种做法不仅鼓励了更多的反应，而且减少跟风的可能性。