نتایج جستجو برای: viscometric degree of polymerization

تعداد نتایج: 21171127  

Journal: :Journal 1999
M G Fleming W A Maillet

Because of the dental profession's increased utilization of light-cured restorative materials, there has been a corresponding increase in research into the light sources used to initiate polymerization. The argon laser is one promising source, as the wavelength of light emitted by this laser is optimal for the initiation of polymerization of composite resins. The literature reflects a strong di...

Journal: :علوم و تکنولوژی پلیمر 0
محمدعلی سمسارزاده محمدرضا کلایی

as we know oxygen is one of the main inhibitors of polymerization of vinyl acetate. therefore, nitrogen is used in order to make sure of system's high purity. to maintain purity it is necessary to find out the rate of the oxygensolution in polymerization system under different conditions of polymerization. it is concluded that incoming nitrogen to the system would remove the oxygen from th...

Journal: :Soft Matter 2021

Judicious control over the mean degree of polymerization each block in a amphiphilic diblock copolymer ensures that corresponding worm gel exhibits thermoreversible (de)gelation behavior, as judged by TEM, SAXS and rheology studies.

2013
Jiangping Huang Wenzhi Luo Anan Liu

In the procedure of polyvinyl alcohol production, it is hardly accurate measuring the Vinyl Acetate (VAC) polymerization rate. To solve this awkward situation, this paper adopt Genetic Algorithm-Back Propagation (GA-BP) Neural Network to fit the nonlinear relation of the variables which derives from the production process by setting the VAC polymerization rate as the master variable and the ini...

2017
Jian Wu Lifen Zhang Zhenping Cheng Xiulin Zhu

Photochemistry serves as a wonderful means to facilitate various chemical reactions and is indeed unique in its powerful ability to meet the energetic requirements for conducting processes that would not be accomplished using thermal counterparts. In this work, a novel photocatalyzed Fe-based atom transfer radical polymerization (ATRP) of methyl methacrylate (MMA) was performed under UV irradia...

Journal: :Chemcatchem 2022

The Cover Feature shows an artistic interpretation of a supported polymerization catalyst particle that is fragmenting during ethylene polymerization. In their Research Article, F. Meirer, B. M. Weckhuysen and co-workers used high resolution X-ray electron microscopy to elucidate the origins sectioning fragmentation mechanism in two different silica-supported olefin catalysts at single level. o...

2010
Magnus Eriksson

Telechelic polyesters have successfully been synthesized with lipasecatalyzed polymerization. The produced telechelics had a high degree of difunctionalization, high purity (requiring little or no workup) and controlled degree of polymerization. The syntheses were performed in one-pot one-step reaction systems. Two different types of lipase-catalyzed polymerizations were applied – ring-opening ...

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