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TEMPO-mediated "living" free radical...

Lin, Marcus.

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TEMPO-mediated "living" free radical polymerization of styrene.

紀錄類型:	書目-電子資源 : Monograph/item
正題名/作者:	TEMPO-mediated "living" free radical polymerization of styrene./
作者:	Lin, Marcus.
面頁冊數:	140 p.
附註:	Source: Masters Abstracts International, Volume: 42-01, page: 0280.
Contained By:	Masters Abstracts International42-01.
標題:	Engineering, Chemical. -
電子資源:	http://pqdd.sinica.edu.tw/twdaoapp/servlet/advanced?query=MQ81091
ISBN:	0612810917

TEMPO-mediated "living" free radical polymerization of styrene.
Lin, Marcus.

TEMPO-mediated "living" free radical polymerization of styrene. - 140 p.

Source: Masters Abstracts International, Volume: 42-01, page: 0280.

Thesis (M.Sc.(Eng))--Queen's University at Kingston (Canada), 2003.

In an effort to increase the rate of miniemulsion polymerization mediated by stable free radicals while monitoring such important parameters as 'livingness' (proportion of polymer chains still capped by stable free radicals) and molecular weight distribution, such factors as initial aqueous pH, polymerization method, temperature, surfactant and additives have been studied. Stable free radical polymerization (SFRP) in miniemulsion has been carried out with different routes of initiation. In polymerization initiated by benzoyl peroxide, the rate of conversion increases with decreasing initial aqueous pH. Molecular weight distribution remains narrow with the polydispersity index staying below 1.35. In comparison, hexadecane-free miniemulsions initiated with TEMPO-terminated oligomer of polystyrene give a higher polymerization rate. In addition, rate of polymerization increases with temperature. Lower conversion is observed when DOWFAX 8390 instead of SDBS is used as the surfactant. On the other hand, conversions are much improved when ascorbic acid is delivered to the miniemulsion in a semi-batch feed. With little sacrifice of product quality, polymerization rate has been increased, giving high (>95%) or even complete conversion, which cannot be otherwise achieved. The degree of 'livingness' (DOL), defined as the mole fraction of stable free radical-capped chains, decreases with conversion in each case. Moreover, additives that accelerate polymerizations do not lower the DOL at a given conversion.

ISBN: 0612810917Subjects--Topical Terms:

1018531
Engineering, Chemical.

TEMPO-mediated "living" free radical polymerization of styrene.
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