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Seeded dispersion polymerization.

Song, Zhipeng.

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Seeded dispersion polymerization.

Record Type:	Language materials, printed : Monograph/item
Title/Author:	Seeded dispersion polymerization./
Author:	Song, Zhipeng.
Description:	216 p.
Notes:	Source: Dissertation Abstracts International, Volume: 71-06, Section: B, page: 3812.
Contained By:	Dissertation Abstracts International71-06B.
Subject:	Chemistry, Polymer. -
Online resource:	http://pqdd.sinica.edu.tw/twdaoapp/servlet/advanced?query=3404112
ISBN:	9781124006321

Seeded dispersion polymerization.
Song, Zhipeng.

Seeded dispersion polymerization. - 216 p.

Source: Dissertation Abstracts International, Volume: 71-06, Section: B, page: 3812.

Thesis (Ph.D.)--Lehigh University, 2010.

Particle formation, aggregation, and growth behavior were investigated in seeded dispersion polymerization of methyl methacrylate (MMA) using sub-micron size polymer particles as seed.

ISBN: 9781124006321Subjects--Topical Terms:

1018428
Chemistry, Polymer.

Seeded dispersion polymerization.
LDR:05179nam 2200397 4500 001 1391189
005 20101228074321.5
008 130515s2010 ||||||||||||||||| ||eng d
020 $a 9781124006321
035 $a (UMI)AAI3404112
035 $a AAI3404112
040 $a UMI $c UMI
100 1 $a Song, Zhipeng. $3 1669586
245 1 0 $a Seeded dispersion polymerization.
300 $a 216 p.
500 $a Source: Dissertation Abstracts International, Volume: 71-06, Section: B, page: 3812.
500 $a Advisers: Andrew Klein; Mohamed S. El-Aasser; E. David Sudol.
502 $a Thesis (Ph.D.)--Lehigh University, 2010.
520 $a Particle formation, aggregation, and growth behavior were investigated in seeded dispersion polymerization of methyl methacrylate (MMA) using sub-micron size polymer particles as seed.
520 $a The relationship between the final particle number (N(final)) and the initial seed number (N(initial)) was studied under various reaction conditions. It was found that there is a critical point for N(initial) to control N(final). The critical point is located at N(ab initio), which is the number of final particles obtained from the ab initio (non-seeded) dispersion polymerization using the same recipe. N(final) is equal to N(ab initio) when N (initial) is less than N(ab initio). A linear relationship between N(final) and N(initial) was found when N(initial) is greater than N( ab initio). The slope of the straight line, which indicates the ratio of N(final) over N(initial) is a function of reaction conditions (initial seed size, number, and material; initiator concentration). The slope decreases with the initiator concentration. It was found that when a high initiator concentration (0.52 wt% and 1 wt% AIBN) was used, the slope is typically less than 1 and increases with the seed size. In the cases of low initiator concentration (0.23 wt% and 0.3 wt% AIBN), the slope can be greater than 1. When the same size particles were used in seeded dispersion polymerizations of MMA, poly methyl methacrylate (PMMA) seed gave the largest slope, polystyrene (PS) gave a medium one, and crosslinked PMMA seed gave the smallest one (nearly zero).
520 $a Seed particles were traced in seeded dispersion polymerization of MMA using sub-micron size crosslinked fluorescent PMMA particles as seed. All of the seed particles ended up inside the final particles. Final particles containing more than one seed indicate that aggregation occurred during the reaction.
520 $a Seed particles were located and tracked in the seeded dispersion polymerization of MMA using sub-micron PS latex particles as seed by means of a refractive index matching technique. The populations of particles containing different number of seeds were analyzed during the reaction. It was found that there are two transition points for the population change. The number of PMMA particles containing no seed particle increased from zero to 9% at the first transition point, which occurred at a quite low conversion (<1%), and remained constant after that. The number of PMMA particles with one seed decreased from 100% to 75% at the first transition point and continued to decrease to 60% at the second transition point, which occurred at 8.7% conversion. After this point, its number remained constant towards the end of the reaction. The number of PMMA particles with two seeds increased from zero to 15% at the first transition point and continued to increase to 23% at the second transition point. It then remained constant. There were some PMMA particles containing more than two seed particles, but their population was less than 10% of the total.
520 $a A model was developed to describe the whole dispersion polymerization process, including: (1) polymerization in both particle and continuous phases; and (2) particle nucleation, aggregation, stabilization, and growth. Two particle populations were detected during the simulation using this model. The first population of particles are small, but have a number that is one to three orders of magnitude greater than that of the second population of particles. They are unstable and are considered as transient species. They are continuously generated and captured. They serve as a volume reservoir to the second population of particles. The second population of particles are large in size, but small in number compared to the first population. They are stable and capture all the first population particles. The model prediction for the seeded dispersion polymerization agrees well with the experimental data on the N(final) and N(initial) relationship.
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. $b Chemical Engineering. $3 1669587
773 0 $t Dissertation Abstracts International $g 71-06B.
790 1 0 $a Klein, Andrew, $e advisor
790 1 0 $a El-Aasser, Mohamed S., $e advisor
790 1 0 $a Sudol, E. David, $e advisor
790 1 0 $a Sudol, E. David $e committee member
790 1 0 $a Daniels, Eric S. $e committee member
790 1 0 $a Dimonie, Victoria L. $e committee member
790 1 0 $a Jiang, Sheng $e committee member
790 $a 0105
791 $a Ph.D.
792 $a 2010
856 4 0 $u http://pqdd.sinica.edu.tw/twdaoapp/servlet/advanced?query=3404112