Semicontinuous emulsion polymerization of vinyl acetate. IV. Homopolymerization with poly(vinyl alcohol)

Donescu, D.; Goşa, Kristiana; Languri, I.

doi:10.1002/actp.1989.010400110

Cited by 10 publications

(2 citation statements)

References 18 publications

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“…Increased adsorption of poly(vinyl alcohol) will result in a reduction of the average particle size and, thus, an increase in latex viscosity 19. Donescu et al determined that the glass transition temperature of polyVAc decreases due to formation of a hydration shell when polyVAc latices are obtained in the semicontinuous process in the presence of poly(vinyl alcohol) 20. They reported the existence of bound water on the polymer particles using DTG and TGA measurements during the evaporation of polyVAc latices.…”

Section: Introductionmentioning

confidence: 99%

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Semicontinuous emulsion polymerization of vinyl acetate: Effect of ethoxylation degree of nonionic emulsifiers

Sarac

Erbil

Yıldırım

2002

J of Applied Polymer Sci

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Poly(vinyl acetate) latices were prepared in the presence of an ammonium persulfate initiator, 10 -50 mol of an ethoxylated nonylphenol nonionic emulsifier, and a poly(vinyl alcohol) colloid stabilizer by applying semicontinuous emulsion polymerization (delayed monomer and initiator addition process) in a laboratory scale similar to industrial practice. Two approaches were applied: the molar concentration of the nonionic emulsifier was kept constant and the weight ratios in the polymerization recipe varied or the weight ratios were kept constant. The effects of the change in the ethoxylation degree of the emulsifier to the final latex viscosity, average polymer molecular weight, polymer grafting degree, surface tension of the latex, and the surface free energy of the dried films were investigated. It was determined that the resultant latex viscosity decreases and the viscosity-average polymer molecular weight increases with increase of the nonionic emulsifier ethoxylation degree. The increase of the ethoxylation degree does not seriously affect the surface tension of the resultant latex or the surface free energy of the dried poly(vinyl acetate) films.

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Section: Introductionmentioning

confidence: 99%

“…They reported the existence of bound water on the polymer particles using DTG and TGA measurements during the evaporation of polyVAc latices. Water was considered as a true plastifier 20…”

Section: Introductionmentioning

confidence: 99%

Semicontinuous emulsion polymerization of vinyl acetate: Effect of ethoxylation degree of nonionic emulsifiers

Sarac

Erbil

Yıldırım

2002

J of Applied Polymer Sci

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Semicontinuous emulsion polymerization of vinyl acetate. VIII. Copolymerization with di‐2‐ethylhexyl maleate

1990

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The semicontinuous emulsion copolymerization of vinyl acetate with 2-ethylhexyl maleate has been studied. The amount of polymer obtained during the continuous addition ot comonomers increases at first nonlinearly than linearly with time. During this period the viscosity of the obtained emulsion is not proportional t o the polymer content. The conversions are affected by the reaction conditions, e.g. the stirring rate and the amount of the transfer agent nbutanol and its distribution between the initial reactor charge and the continuously introduced comonomers. Semikontinuierliche Emulsionspolymerisation von Vinylacetat. V I I I . Copolymerisation mit Di-2-ethylheqlmaleatDie semikontinuierliche Emulsionscopolymerisation von Vinylacetat mit 2-Ethplhexylmaleat wurde untersucht. Die Menge des bei kontinuierlicher Zufuhrung der Comonomere erhaltenen Polymers nimmt mit der Zeit zunachst nichtlinear, dann linear zu. In diesem Stadium des Prozesses ist die Viskositat der entstehenden Emulsion nicht proportional zum Polymergehalt. Der Umsatz wird durch die Reaktionsbedingungen beeinflufit, z. B. durch die Riihrgeschwindigkeit und durch die Menge des als Transfermittel zugegebenen n-Butanols sowie dessen Verteilung zwischen der anfanglichen Reaktorfullung und den kontinuierlich zugefuhrten Comonomeren. IIoaynenpepuenas s .~y~~b c u o n n a~ n o n w e p w a y u s sunmayemama. V I I I , ConoJcwepwayuR c a u -2 -a m m z e~c m -firnearno&u3YYeH npOqeCC IIOJIyHeIlpepbIBHOfi aMyJIbCkiOHHOfi COIIOJlHMepH3aqkiki BHHkiJIaqeTaTa C 2-3THJIreKCHJIMaJIeaTOM. ~OJIkiVeCTBO IIOJIHMepa, IIOJIyqaeMOrO npH HenpepbIBHOfi AO3kiPOBKe COMOHOMepOB, CO BpeMeHeM YBeJIHWiBaeTCR CHaqaJIa HeJIUHefiHO, a 3aTeM JIkiHefiHO. B 3TOfi CTWHki IIpOUeCCa BR3KOCTb 06paay101~eic~ BMyJIbCHH HenpOIIOpqHO-HaJIbHa COAepXaHkiIO nOJlHMepa. YCJIOBkiR PeaKqHH, HaIIpkiMep, CKOpOCTb nepeMeIlIHBaHUR, KOJIHqeCTBO U. 6yTaHOJIa (B KaqecTBe nepenaTsma), ero pacnpeAeneHHe Memny HaqajIbHm conepmmm peawropa ki Henpepbmio ZoaHpy-eMbIMki COMOHOMepaMH, OKa3bIBaIOT BJIHRHHe Ha KOHBePCHIO PeaKqHH.

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Semicontinuous emulsion polymerization of vinyl acetate IX. Decomposition of the initiator

Donescu¹,

Fusulan²

1991

Acta Polymerica

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The way in which the decomposition reaction of a persulfate initiator is influenced by the nature of reactants of the polymerization medium and by the working conditions during the semicontinuous polymerization and copolymerization of vinyl acetate is studied. The rate of the splitting reaction of potassium persulfate is higher in the aqueous phase containing a protective colloid and surfactant. The splitting rate is smaller in the presence of vinyl acetate. The presence of hydrophobic comonomers decreases the rate ofinitiator decomposition. An increase of the addition rate of monomers leads to an increase of the obtained polymer and of the splitting rate of the initiator. Semikontinuierliche Emulsionspolymerisation von Vin.dacetat. IX. Zer.~etziingsreuktion rles InitiatorsDer EinfluD der Reaktanten im Polymerisationsmedium und der Reaktionsbedingungen auf die Zersetzungsreaktion eines Persulfatinitiators wird untersucht. Die Geschwindigkeit der Spaltungsreaktion von Kaliumpersulfat steigt bei Anwesenheit eines Schutzkolloids und einer oberflkhenaktiven Substanz in der wPDrigen Phase. in Gegenwart von Vinylacetnt ist die Spaltungsgeschwindigkeit niedriger. Bei Anwesenheit hydrophober Comonomere nimmt die Zersetzungsgeschwindigkeit dcs Initiators ab. Ein Anstieg der Zufiihrungsgeschwindigkeit der Monomere erhoht die Menge an erhaltenem Polymer und die Spaltungsgeschwindigkeit des Initiators. DONESCU and FUSULAS: Scmicontinuous emulsion polymerizntion of vinyl acetate. 1X Systcm')Acta Polymcriu 42 (1Wl) Nr. 10

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Semicontinuous emulsion polymerization of vinyl acetate. IV. Homopolymerization with poly(vinyl alcohol)

Cited by 10 publications

References 18 publications

Semicontinuous emulsion polymerization of vinyl acetate: Effect of ethoxylation degree of nonionic emulsifiers

Semicontinuous emulsion polymerization of vinyl acetate: Effect of ethoxylation degree of nonionic emulsifiers

Semicontinuous emulsion polymerization of vinyl acetate. VIII. Copolymerization with di‐2‐ethylhexyl maleate

Semicontinuous emulsion polymerization of vinyl acetate IX. Decomposition of the initiator

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