苯乙烯的

When ATRP of styrene was investigated with 1-phenylethyl bromide/benzyl a,a-dibromide mixture as initiator, the GPC chromatogram shows two elution peaks and the molecular weighs of the peaks are approximately in a 2/1 ratio. It suggests that benzyl dibromide is a difunctional initiator of ATRP of styrene. The analysis of end group using 1H-NMR also proves the result above.

采用1-苯基溴乙烷／α，α-二溴化苄混合引发剂进行苯乙烯的ATRP反应时，所得聚苯乙烯的GPC谱图为双峰，分子量相差一倍，初步证明了α，α-二溴化苄引发苯乙烯ATRP反应时是双官能引发剂，并用~1H-NMR对聚合物结构进行分析，进一步证明了α，α-二溴化苄引发苯乙烯ATRP时是双端同时增长的。

Oxidative methylation of toluol to styrene is a new process studied widely recently.

甲苯氧化甲基化合成苯乙烯是目前正在探讨的合成苯乙烯的新工艺。

In this system trimethylamine was used as a trigger. Under the highest yield of styrene oxide, the amount of oxidant, phase transfer and catalyst were respectively 31.16%、8.96%、1.15%relative to the amount of styrene. With the experimental data, the reaction dynamics of the system was studied.

通过对钼蓝-氧化三丁锡体系动力学的分析计算，得出在该反应体系中，苯乙烯催化氧化成氧化苯乙烯的宏观反应动力学方程为：，其反应级数约为n=2，反应速率常数h-1mol-1，反应活化能Ea=165.08kJ/mol。

In the three systems, system realizes the crosslinking of PVC bases on the peroxide crosslinking mechanism, the tensile strength of crosslinked PVC has been improved somewhat, the IR spectrum of gel demonstrates that there are characteristic absorption peaks of n-alcohol that belongs to ethanol amine and benzenoid group. From the analysis of gel structure , deduces that the mechanism of crosslinking reaction: under the initiations of peroxide and high temperature, PVC yields macromolecules free radicals, at the same time , styrene"s polymerization and grafting onto PVC takes place, at last the system forms crosslinking structure through coupling between radicals; confirms that triethanol amine can absorb HC1 produced by degradation of PVC, so improves the crosslinking efficiency of peroxide, decreases the HCl"s promotion for PVC"s degradation; deduces that triethanol amine can activate the PVC macromolecules and prolong the free radicals" life-time of PVC macromolecules; the effect to the PVC macromolecule makes styrenes graft reaction easy, and thus improves the crosslinking efficiency.

三种体系中三乙醇胺/过氧化二异丙苯/苯乙烯体系基于过氧化物交联机理实现了聚氯乙烯的交联，聚氯乙烯交联后拉伸强度有一定提高，凝胶红外光谱分析证实了凝胶结构中含有乙醇胺的伯醇基团特征吸收和苯环的特征吸收，由凝胶结构分析，推断出交联反应的机理：聚氯乙烯在过氧化物和热作用下产生大分子自由基，苯乙烯在过氧化物和大分子自由基的作用下发生聚合和接枝反应，最终通过自由基之间的偶合产生交联；证实三乙醇胺可以吸收聚氯乙烯分解产生的HCl，提高了过氧化物的交联效率，消弱了HCl对聚氯乙烯降解的促进作用；推断三乙醇胺可以活化聚氯乙烯大分子并有可能使聚氯乙烯大分子自由基存在的时间得以延长，对聚氯乙烯大分子的作用使苯乙烯的接枝反应易于发生，从而提高了交联效率。

A CR/polystyrene IPN blend was prepared by stepwise synthesis based on CR and styrene monomer and using divinyl benzene as crosslinking agent of PS.

以CR和苯乙烯单体为原料，二乙烯基苯为苯乙烯的交联剂，采用分步合成法制备CR/聚苯乙烯互穿网络共混物。

Firstly, Copolymerization of acrylamide and styrene was carried out in a microemulsion system, in which AM aqueous solution was the continue phase and St was the dispersed phase using ST-80 as surfactants respectively, then hydroxamic functions were prepared with hydroxylamine salt at temperatures of from 60℃ to 90℃.

首先以丙烯酰胺水溶液为连续相，以苯乙烯为分散相，ST-80为乳化剂制成微乳液，在15℃~35℃合成丙烯酰胺与苯乙烯的共聚物；然后采用程序控温方式，在60℃~90℃用硫酸羟胺将共聚物羟肟化合成了一种带有苯环结构的嵌段型氧肟酸类聚合物材料。

At 15-35℃, copolymerization of acrylamide and styene was carried out in a microemulsion system, in which AM aqueous solution was the continuous phase and St was the dispersed phase using ST-80 as surfactants, respectively. Hydroxamic functions were prepared with hydroxylamine salt at temperatures from 60℃ to 90℃.

以丙烯酰胺水溶液为连续相，苯乙烯为分散相，ST-80为乳化剂制成微乳液，在15~35℃下合成丙烯酰胺与苯乙烯的共聚物，采用程序控温方式，在60~90℃下使用硫酸羟胺将共聚物羟肟化得到产物。

When ATRP of styrene was investigated with 1-phenylethyl bromide/benzyl a,a-dibromide mixture as initiator, the GPC chromatogram shows two elution peaks and the molecular weighs of the peaks are approximately in a 2/1 ratio. It suggests that benzyl dibromide is a difunctional initiator of ATRP of styrene. The analysis of end group using 1H-NMR also proves the result above.

采用1-苯基溴乙烷／α，α-二溴化苄混合引发剂进行苯乙烯的ATRP反应时，所得聚苯乙烯的GPC谱图为双峰，分子量相差一倍，初步证明了α，α-二溴化(来源：ABf399C论文网www.abclunwen.com)苄引发苯乙烯ATRP反应时是双官能引发剂，并用~1H-NMR对聚合物结构进行分析，进一步证明了α，α-二溴化苄引发苯乙烯ATRP时是双端同时增长的。

In the asymmetric epoxidation of cis-β-methylstyrene, the selectivity and enantiometric excess for the epoxides reached 96% and 78%, respectively. The recyclability of the catalyst was also studied.

结果表明，该配合物对顺－β-甲基苯乙烯的不对称环氧化反应具有很好的催化性能，产物选择性达96%，ee值达78%，以顺－β-甲基苯乙烯为底物，m-CPBA为氧化剂，考察了该配合物催化剂的循环使用性能。

Based on the pure styrenes polymerization, the inhibited polymerization by inhibitor was studied. The effect of polymerization temperature, the addition of ethylbenzene, the content of inhibitor, and the compound of inhibitors was measured for the bulk thermal polymerization of styrene.

在纯苯乙烯聚合基础上，着重考察了阻聚剂(缓聚剂DNBP和阻聚剂M)阻聚下苯乙烯的聚合行为，并系统研究了聚合温度、乙苯含量、缓聚剂及阻聚剂含量、阻聚剂的复配对苯乙烯本体热聚合动力学的影响规律。

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。