查询词典 polystyrene

Extruded polystyrene insulation board is a polystyrene resin as raw material, through the special process of continuous extrusion molding of rigid foam board, its in-house as an independent closed bubble structure, is a high-compression, non-absorbent, moisture-proof, airtight, light-weight, corrosion resistance, long life, excellent performance and low thermal conductivity of the environment-friendly insulation materials.

挤塑聚苯乙烯保温板是以聚苯乙烯树脂为原料、经由特殊工艺连续挤出发泡成型的硬质板材，其内部为独立的密闭式气泡结构，是一种具有高抗压、不吸水、防潮、不透气、轻质、耐腐蚀、使用寿命长、导热系数低等优异性能的环保型保温材料。

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。

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。

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。

A very mild and extremely efficient hydrolysis method for transformation of polystyrene-b-poly (tert-butyl acrylate) to polystyrene-b-poly was designed and carried out using more convenient and inexpensive chlorotrimethylsilane/sodium iodide as reagents.

在温和的条件下使用廉价方便的三甲基硅氯烷/碘化钠作试剂，在乙腈溶剂中，50℃下使聚苯乙烯-嵌-聚丙烯酸特丁酯高效的水解。用透射电镜和动态光散射对嵌段共聚物聚苯乙烯-b-聚丙烯酸在水介质中的胶束化进行了研究。

Results of DSC determinations show that an adequate content of atactic polystyrene is favourable of the crystallization of isotactic polystyrene,but the addition of more aPS linearly decreases the crystallinity of iPS because of the dilution effect.

DSC测定表明，产物中的无规物有利于等规聚苯乙烯结晶，但对结晶的熔点有降低作用。向产物加入更多的aPS则由于稀释效应而使iPS的结晶度线性下降。

The combination of dilute sulfuric acid and organic solvent has been developed to demulsify the highly stable polystyrene microemulsion. 2. The degree of sulfonation was quantified based on the infrared spectra. 3. The superfine sulfonated polystyrene particles and the crosslinked polyvinyl alcohol films imbedded SSPS particles were employed to conduct out the adsorption for cationic red dye (5GN), and showed a satisfied results.

本课题的特色与创新之处： 1、独创了采用稀H2SO4和有机溶剂对聚苯乙烯微乳液混合破乳的方法； 2、基于红外光谱测量，定量计算出聚苯乙烯磺化度； 3、在国内外较早地开展了超细聚苯乙烯型离子交换树脂及其离子交换膜对阳离子染料的吸附作用的研究。

Gel-type cross-linked polystyrene-isocyanuric acid resin has been obtained by reaction of chloromethylated polystyrene with isocyanuric acid under the existence of triethylamine.

由氯甲基化低交联聚苯乙烯和异氰尿酸在三乙胺作用下反应，制得了凝胶型交联聚苯乙烯-异氰尿酸树脂，测定了该树脂对苯酚和间苯二酚在不同温度下的吸附等温线，依据Clapeyron-Clausius方程从吸附等温线计算出了吸附热，从热力学的角度论证了树脂是基于氢键键合和疏水作用而吸附苯酚和间苯二酚的。

According to the characteristic of silver nanoparticles, their uniform dispersion in reaction media was obtained by surface modification, ultrasonic radiation and the select of emulsion, and then emulsion polymerization system were formed by combination with reactive monomer and initiator. Nano-Ag/Polystyrene core-shell particles were prepared by emulsion polymerization and their microstructure were characterized by TEM, FTIR, XPS, AFM and TG/DTA. The experimental results showed that silver nanoparticles were coated by polymer and the composite particles had typical core/shell structure, and the microlevel combination was realized. Meantime, the form mechanism of nano-Ag/polystyrene core-shell particles was tentatively researched. The conclusion is that the perfect coating was able to obtained by the control of reaction condition.

根据纳米银粒子的特性，借助于表面处理、超声辐照以及乳化剂的选择，使其均匀分散在反应介质中，再与反应单体、引发剂等形成乳液聚合体系；采用乳液聚合方法、包裹聚合方式，制备出纳米银/聚苯乙烯核壳复合粒子，并借助于TEM、FTIR、 XPS、AFM、TG/DTA等分析手段对复合粒子微观结构进行了表征；结果表明：纳米银粒子表面被聚合物层包覆，复合粒子呈明显的核壳结构，实现了微观尺度上的复合；同时，初步探讨了纳米银/聚苯乙烯核壳复合粒子的形成机理，指出：通过控制反应条件，可以使形成纳米银/聚苯乙烯核壳复合粒子的聚合反应方式占主导地位，实现最大限度地包覆。

The properties of single chain and pauci chain polystyrene microspheres and recent results on the electron microscopy and selected area electron diffraction of single chain monocrystals of polyethylene oxide, isotactic polystyrene, cis1,4 polybutadiene and gutta percha are presented and discussed.

介绍和讨论了单链和寡链聚苯乙烯玻璃体微球的性质以及聚环氧乙烷、同立构聚苯乙烯、－，4－丁二稀、－，4－异戊二烯单链单晶电子显微镜和选区电子衍射观察的最新结果。

According to the clear water experiment, aeration performance of the new equipment is good with high total oxygen transfer coefficient and oxygen utilization ratio.

曝气设备的动力效率在叶轮转速为120rpm～150rpm时取得最大值，此时氧利用率和充氧能力也具有较高值。

The environmental stability of that world - including its crushing pressures and icy darkness - means that some of its most famous inhabitants have survived for eons as evolutionary throwbacks, their bodies undergoing little change.

稳定的海底环境─包括能把人压扁的压力和冰冷的黑暗─意谓海底某些最知名的栖居生物已以演化返祖的样态活了万世，形体几无变化。