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Effects of agitation in emulsion pol...

Krishnan, Sitaraman.

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Effects of agitation in emulsion polymerization of n-butyl methacrylate and its copolymerization with N-methylol acrylamide.

Record Type:	Electronic resources : Monograph/item
Title/Author:	Effects of agitation in emulsion polymerization of n-butyl methacrylate and its copolymerization with N-methylol acrylamide./
Author:	Krishnan, Sitaraman.
Description:	427 p.
Notes:	Source: Dissertation Abstracts International, Volume: 63-12, Section: B, page: 5971.
Contained By:	Dissertation Abstracts International63-12B.
Subject:	Engineering, Chemical. -
Online resource:	http://pqdd.sinica.edu.tw/twdaoapp/servlet/advanced?query=3073982
ISBN:	0493936726

Effects of agitation in emulsion polymerization of n-butyl methacrylate and its copolymerization with N-methylol acrylamide.
Krishnan, Sitaraman.

Effects of agitation in emulsion polymerization of n-butyl methacrylate and its copolymerization with N-methylol acrylamide. - 427 p.

Source: Dissertation Abstracts International, Volume: 63-12, Section: B, page: 5971.

Thesis (Ph.D.)--Lehigh University, 2003.

Effects of agitation in emulsion polymerization were investigated using a 2 dm<super>3</super> stirred reactor and Rushton turbine agitators and a semi-batch mode of reaction. High-solids recipes giving monodisperse polymer particles with core-shell morphology were developed for monomer-starved, semi-batch emulsion copolymerization of <italic>n</italic>-butyl methacrylate (BMA) and N-methylol acrylamide (NMA). A larger agitator, or a higher agitation speed, resulted in higher particle concentration, more viscous latex, less water-soluble polymer, and higher mass of coagulum. Better incorporation of NMA in the polymer particles was because of greater particle-water interfacial area and more efficient macromixing in the reactor. A mechanism where the surface of the polymer particles is the most favorable site for copolymerization, is proposed for the incorporation of NMA. Nucleation of a greater number of particles at higher agitation intensity was a general observation for recipes with surfactant concentrations below the critical micelle concentration (cmc).

ISBN: 0493936726Subjects--Topical Terms:

1018531
Engineering, Chemical.

Effects of agitation in emulsion polymerization of n-butyl methacrylate and its copolymerization with N-methylol acrylamide.
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100 1 $a Krishnan, Sitaraman. $3 1946605
245 1 0 $a Effects of agitation in emulsion polymerization of n-butyl methacrylate and its copolymerization with N-methylol acrylamide.
300 $a 427 p.
500 $a Source: Dissertation Abstracts International, Volume: 63-12, Section: B, page: 5971.
500 $a Adviser: Andrew Klein.
502 $a Thesis (Ph.D.)--Lehigh University, 2003.
520 $a Effects of agitation in emulsion polymerization were investigated using a 2 dm<super>3</super> stirred reactor and Rushton turbine agitators and a semi-batch mode of reaction. High-solids recipes giving monodisperse polymer particles with core-shell morphology were developed for monomer-starved, semi-batch emulsion copolymerization of <italic>n</italic>-butyl methacrylate (BMA) and N-methylol acrylamide (NMA). A larger agitator, or a higher agitation speed, resulted in higher particle concentration, more viscous latex, less water-soluble polymer, and higher mass of coagulum. Better incorporation of NMA in the polymer particles was because of greater particle-water interfacial area and more efficient macromixing in the reactor. A mechanism where the surface of the polymer particles is the most favorable site for copolymerization, is proposed for the incorporation of NMA. Nucleation of a greater number of particles at higher agitation intensity was a general observation for recipes with surfactant concentrations below the critical micelle concentration (cmc).
520 $a Effects of agitation on the kinetics of emulsion polymerization of BMA were studied using reaction calorimetry. At a reaction temperature of 70°C, the molecular weight was higher at higher agitation speed, while at 50°C, the converse was true. The order of dependence of the mass of coagulum on the agitation speed depended on the surfactant coverage of the polymer particles: the variation was almost two-fold (1.2 to 2.3). The coagulum mass was related to surfactant coverage using results from the DLVO theory. The volume-surface average diameter of the monomer droplets in the emulsion scaled to the 1.6 power of agitation speed, and the droplet size distribution was log-normal.
520 $a Thermal crosslinking of the copolymer particles and films was investigated, and the effect of carbon tetrabromide on the gel content of the copolymer films was studied experimentally and theoretically. The increase in the gel content as a function of time during thermal curing was studied at temperatures of 90°C, 120°C, and 150°C. The calculated time required for disentanglement of the polymer chains explained the observed induction periods for gel formation at 90°C and 120°C. Morphologies of copolymer particles and latex films were studied using transmission electron microscopy and atomic force microscopy. Unique surface features attributable to crosslinked shell and linear core of the copolymer particles, were observed by AFM.
590 $a School code: 0105.
650 4 $a Engineering, Chemical. $3 1018531
650 4 $a Chemistry, Polymer. $3 1018428
650 4 $a Engineering, Materials Science. $3 1017759
690 $a 0542
690 $a 0495
690 $a 0794
710 2 0 $a Lehigh University. $3 515436
773 0 $t Dissertation Abstracts International $g 63-12B.
790 1 0 $a Klein, Andrew, $e advisor
790 $a 0105
791 $a Ph.D.
792 $a 2003
856 4 0 $u http://pqdd.sinica.edu.tw/twdaoapp/servlet/advanced?query=3073982