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Fundamentals of emulsion of polymeri...

Ortiz Alba, Emilio.

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Fundamentals of emulsion of polymerization studied by reaction calorimetry.

紀錄類型:	書目-語言資料,印刷品 : Monograph/item
正題名/作者:	Fundamentals of emulsion of polymerization studied by reaction calorimetry./
作者:	Ortiz Alba, Emilio.
面頁冊數:	287 p.
附註:	Adviser: Mohamed S. El-Aasser.
Contained By:	Dissertation Abstracts International68-10B.
標題:	Chemistry, Polymer. -
電子資源:	http://pqdd.sinica.edu.tw/twdaoapp/servlet/advanced?query=3285742
ISBN:	9780549277491

Fundamentals of emulsion of polymerization studied by reaction calorimetry.
Ortiz Alba, Emilio.

Fundamentals of emulsion of polymerization studied by reaction calorimetry. - 287 p.

Adviser: Mohamed S. El-Aasser.

Thesis (Ph.D.)--Lehigh University, 2007.

Another significant finding of this investigation was that the rate of polymerization during Stage II can vary in many different ways, and not only with an increasing profile. (Abstract shortened by UMI.)

ISBN: 9780549277491Subjects--Topical Terms:

1018428
Chemistry, Polymer.

Fundamentals of emulsion of polymerization studied by reaction calorimetry.
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100 1 $a Ortiz Alba, Emilio. $3 1280744
245 1 0 $a Fundamentals of emulsion of polymerization studied by reaction calorimetry.
300 $a 287 p.
500 $a Adviser: Mohamed S. El-Aasser.
500 $a Source: Dissertation Abstracts International, Volume: 68-10, Section: B, page: 6692.
502 $a Thesis (Ph.D.)--Lehigh University, 2007.
520 $a Another significant finding of this investigation was that the rate of polymerization during Stage II can vary in many different ways, and not only with an increasing profile. (Abstract shortened by UMI.)
520 $a Various fundamental aspects of the kinetics of emulsion polymerization were studied using reaction calorimetry to measure the actual kinetic profile. The major part of this investigation was carried out with styrene as the model monomer. The bench mark for comparison of results was a well characterized reaction reported in the literature for the system Styrene/sodium lauryl sulfate/potassium persulfate from which Stage II was defined as a reaction interval with increasing heat of reaction and increasing number of particles after the micelles disappearance. The three main objectives for the project were to gain understanding of the variables affecting the rate of polymerization during Stage II, to investigate the variables controlling the disappearance of monomer droplets and to evaluate the universality of Stage II.
520 $a To accomplish the goals, several series of reactions were carried out to evaluate the effect of the surfactant type and concentration, the effect of ionic strength and free radical charge, the effect of rate of decomposition of initiator, the effect of electrostatic interaction between the surfactant and the initiator, and the effect of monomer properties such as water solubility and propagation rate coefficient. The calorimetric profiles obtained in reactions with sodium lauryl sulfate, Aerosol MA-80 and Abex EP-110 were in agreement with results from Varela de la Rosa regarding the duration of Stage II and the magnitude of the increase in Qr. A significant increase in the number of particle during Stage II was observed only in some of the reactions; although the magnitude and duration was smaller than in previous works.
520 $a Our results confirmed the observation of Stage II nucleation in the S/SLS/KPS system at surfactant concentrations above 8 times the cmc, whereas no increase in Np was observed in this system at surfactant concentrations between 1.1 and 5 times the cmc. In the case of the system S/Aerosol MA/KPS we found that Stage II nucleation is present even at total surfactant concentrations below 1.5 times the cmc. The difference between the free energy of adsorption and free energy of micellization together with the dynamics of micelle formation and surfactant adsorption were discussed to provide a proposed explanation of these observations.
520 $a Stage II nucleation was also observed in reactions carried out with other surfactants or initiators although some reactions did not show any Stage II nucleation. For systems other than S/SLS/KPS the increase in N p was not observed usually for reactions with final particle size larger than 80 nm although it was commonly observed in reactions with final particle size below 60 nm. In some cases the magnitude and conversion range for this increment was reduced by updating the calibration used in the particle size analysis. TEM analysis and CHDF characterization confirmed that the Np became fixed at the beginning of Stage II for other systems studied including Styrene and Methacrylic monomers polymerized with anionic and cationic initiators or surfactants.
520 $a The results obtained in a series of reactions carried out with styrene at 20% solids and 50°C with increasing ionic strength using three different initiator systems, namely, potassium persulfate, VA-044 and hydrogen peroxide/ascorbic acid, indicated that regardless of the reaction components the number of particles became fixed when the average particle size of the PSD in the reaction reached a value between 36 and 41 nm. This finding could be indication that Stage II nucleation is controlled by the collision model for capture of precursor particles.
590 $a School code: 0105.
650 4 $a Chemistry, Polymer. $3 1018428
650 4 $a Engineering, Chemical. $3 1018531
690 $a 0495
690 $a 0542
710 2 $a Lehigh University. $3 515436
773 0 $t Dissertation Abstracts International $g 68-10B.
790 $a 0105
790 1 0 $a El-Aasser, Mohamed S., $e advisor
791 $a Ph.D.
792 $a 2007
856 4 0 $u http://pqdd.sinica.edu.tw/twdaoapp/servlet/advanced?query=3285742