查询词典 polystyrene

These novel reagents were treated with base to produce polystyrene-supported a-seleno carbanions, which reacted with alkyl halides, followed by stereospecific selenoxide syn-elimination to give 2i-vinylphosphonates and is-vinylsulfones respectively.

它们在碱的作用下形成α—硒基碳负离子，然后与卤代烃发生烷基化反应，烷基化后的树脂可以通过温和条件下的氧化消除以良好产率和较高纯度分别合成了烯基磷酸酯和烯基砜。

This novel reagent was treated with LDA to produce polystyrene-supported a-seleno carbanions, which reacted with alkyl halides and epoxides, followed by stereospecific selenoxide syn-elimination to give olefins and allylic alcohols respectively.

它与LDA反应形成α—硒基稳定的碳负离子，再与卤代烃或环氧化合物发生α—烷基化反应，烷基化后的树脂可以在30%的双氧水中进行氧化-消除，以良好产率和较高纯度合成了取代烯烃或烯丙基醇。

The inside of this should be lined with blocks or chippings of polystyrene, of the sort used in house insulation or packaging.

箱子的内部由木屑或家庭包装上经常用到的聚苯乙烯小块填充，或者也可以塞满纸片。

Specializing in the production of polyurethane The board, polystyrene purification boards, water condensers, and other refrigeration equipment.

专业生产聚氨酯库板，聚苯乙烯净化板，水冷凝器，及其他制冷设备。

The morphologies formed were characterized by SEM and DLS methods, and spherical particles with various sizes were observed.5. To obtain a amphiphilic dumbbell-shaped copolymer, we successfully synthesized dendritic-linear-dendritic triblock copolymers composed of linear polystyrene and poly dendrons.

树枝状共聚物最外层PSt-PNAS链段利用乙二胺和NAS活性酯的取代反应交联，同时，中间的聚丙交酯段被降解，得到纳米空心球，用SEM和DLS进行观测和表征。5。

The nuclear magnetic resonance imaging has been used in this work to study the deuterated solvent swollen coal, the cross-linked polyacrylamide hydrogel due to γ-ray irradiation and polystyrene in its θsolvent.

用核磁共振成象方法研究了溶剂中的溶胀煤、γ辐射交联聚丙烯酰胺水凝胶和θ溶剂中的聚苯乙烯。

Usually, with the perdueterated polystyrene of molecular weight of about 250000 and disperse degree of about 3 as the materiales, the opened-cell foams with density of 0.02 g/cm3~0.1g/cm3, the average cell size of 0.2~1μm, and the deuterated ratio of more than 98% could be fabricated.

采用差式扫描量热法，动态机械性能分析仪，及万能材料机等分析测试方法对制得的氘代低密度聚苯乙烯泡沫的热性能和力学性能进行了表征分析。

Polystyrene,polyethylene and their deuterated polymers are important fuel container materials of Z-pinch driven ICF experiment. To meet the shape demand of physical experiment,filaments with the diameter of 30～100 μm were prepared by melt spinning via high pressure capillary rheometer and its accessory section HAUL-OFF system.

聚苯乙烯，聚乙烯及其的氘代物是Z箍缩驱动惯性约束聚变实验中的重要固体燃料容器材料，针对物理实验对其形状的特殊要求，利用高压毛细管流变仪及HAUL-OFF熔体拉伸测试单元进行熔融纺丝，制备出直径为30～100 μm的聚合物丝样品。

Mm layer of extruded polystyrene board floor increase in thermal insulation to prevent a residential basement to heat release.

一层楼面增加20毫米挤塑聚苯板进行保温处理，防止一层住宅向地下室散热。

On gelatin-coated surface, cells were more resistant to shear flow compared to those on tissue culture polystyrene or biocompatible polyurethane. The newly grown cells on the gelatin substrate after flushing for a period of time became further resistant to shear flow.

与组织培养盘之聚苯乙烯或生物相容性之聚碳酸酯型聚胺酯这两种材料相比，在涂布有明胶的基材上，细胞具有较佳之抵抗流场剪应力之能力，而且，其后新长回之细胞，较原先之细胞，更能抵抗流场的进一步冲刷。

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。