查询词典 polymerization

Objective: To investigate differences between the mechanical properties of denture base processed by traditional mixing and malaxation method, and by traditional hot water polymerization and electrical heat-polymerization. And to study which kind of mixing and curing method can enhance the properties of denture base resin.

分别探讨两种不同混合方式和两种不同热加工固化方式对义齿基托树脂性能的影响，从而研究何种混合方式及加热固化方式更有利于提高基托树脂的性能。

Residual monomer of the four groups is far lowest than ISO standardization. Groups of traditional mixing are lower than the malaxation ones. Group of traditional mixing+ hot water polymerization is lower than group of malaxation + electrical heat-polymerization .

4，残余单体含量四组均远远低于标准中所要求的值2.2%，常规混合组残单含量小于捏炼混合组，两者有显著性差异（ P＜0.05），常规混合组+水浴固化组的残单含量低于捏炼混合组+电加热固化组（1：4 P＜0.05）。

As for the mechanical properties, it seems totally that malaxation method is prior to the traditional mixing, electrical heat-polymerization method is prior to conventional hot water one, and the properties of malaxation + electronical heat-polymerization group are the best.

1，组间综合机械性能比较：捏炼混合组优于普通混合方式组；电烤箱固化组优于水浴加热固化组，捏炼组+电烤箱组综合性能最佳。

In this paper, the polymerization kinetics, reaction mechanism, viscosity, molecular weight and MWD of the ring-opening polymerization of cyclosiloxane in the presence of water will be investigated expermentally and analyzed mechanistically in detail.

就具体内容而言，本论文主要进行了以下几个方面的工作：建立反应混合物转化率与凝胶渗透色谱谱图峰面积的标准曲线，采用GPC测定反应混合物转化率和聚合物的分子量及分布。

The determination demonstrated that the anionic polymerization of ε-caprolactam under 230℃ leaded to a mesomorphous form of PA6; the EPDM had heterogeneous nucleation effect on the crystallization of dispersed PA6 phase; in situ polymerization could further reduce crystallization enthalpy of PA6 component on the level of reactive compatibilization.

研究表明，230℃下进行阴离子聚合得到的PA6为β-介晶型；EPDM对这种分散在橡胶相中的PA6的结晶具有异相成核作用；原位聚合可在反应增容的基础上使得共混物中PA6的结晶焓进一步降低。

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 stability of GA-PBCA-NP was also studied.ResultsDue to the agglomerationg of nanoparticles with no stabilizer,it was difficult to preparate.GA-PBCA-NP produced by the two methods both had spheric and smooth outer appearance,uniform distribution,nonadherence and stability.The diameter,ebeding ratio and drug loading in GA-PBCA-NP produced by emulsification polymerization and interfacial polymerization methods were 90～600 nm and 200 nm,60.49% and 73.87%,18.15% and 22.23%,respectively.

结果未添加稳定剂的纳米球表面粘连团聚现象严重，难以成球；乳化聚合法制备的GA-PBCA-NP在透射电镜下观察表面圆整光滑，粒子之间不团聚，不黏连，粒径范围在90～600 nm，包封率为60.49%，载药量为18.15%；界面缩聚法制得的纳米粒表面圆整光滑，粒子之间不团聚，不黏连，粒径大小均匀，都在200 nm左右，包封率为73.87%，载药量为22.23%，两种方法制备的稳定性都较好。

GA-PBCA-NP produced by the two methods both had spheric and smooth outer appearance,uniform distribution,nonadherence and stability.The diameter,ebeding ratio and drug loading in GA-PBCA-NP produced by emulsification polymerization and interfacial polymerization methods were 90～600 nm and 200 nm,60.49% and 73.87%,18.15% and 22.23%,respectively.ConclusionIt is important to add dextran 70 in preparation.

结果未添加稳定剂的纳米球表面粘连团聚现象严重，难以成球；乳化聚合法制备的GA-PBCA-NP在透射电镜下观察表面圆整光滑，粒子之间不团聚，不黏连，粒径范围在90～600 nm，包封率为60.49%，载药量为18.15%；界面缩聚法制得的纳米粒表面圆整光滑，粒子之间不团聚，不黏连，粒径大小均匀，都在200 nm左右，包封率为73.87%，载药量为22.23%，两种方法制备的稳定性都较好。

There are currently three kinds of LFRPs, i.e., 2,2,6,6-tetramethylpiperi- dinyl- N -oxyl mediated system, atom transfer radical polymerization and RAFT-based (reversible addition-fragmentation chain transfer reaction) radical polymerization.

迄今为止，已有稳定自由基如2，2，6，6-四甲基哌啶氮氧游离基调控的体系、原子转移自由基聚合体系和可逆加成-裂解链转移聚合体系问世。

By the inverse microemulsion polymerization,(NH4)2S2O8-Na2SO3 as initiators,with the polymerization systems of the liquid paraffine/Span80-Tween60/AM-H2O-NaAc or the liquid paraffine/Span80-Tween60/AM- DMDAAC-H2O-NaAc, non-ionic PAM and the cationic copolymer P have been synthesized respectively.

采用反相微乳液聚合法，(NH4)2S2O8-Na2SO3为引发剂，液体石蜡/Span80-Tween60/AM-H2O-NaAc和液体石蜡/ Span80-Tween60/AM-DMDAAC-H2O-NaAc为聚合体系，分别制备了PAM和P。

Since historical times,England ,where the early inhabitants were Celts, has been conquered three times .

从有历史以来，英国，在此地早期居住的是凯尔特人，已经被征服了三次。

Bluetooth OBEX File Transfer Enables the sending and receiving of files on your phone via Bluetooth.

蓝牙OBEX文件移动允许经过蓝牙传送和接受文件。。。。