New vinyl ester monomers for emulsion polymers

Smith, Oliver W.; Collins, Martha J.; Martin, Peter S.; Bassett, David R.

doi:10.1016/0033-0655(93)80012-y

Cited by 13 publications

(7 citation statements)

References 1 publication

Supporting

Mentioning

Contrasting

Unclassified

Order By: Relevance

“…By comparison, paints based on all-acrylic latex experienced approximately 20% erosion over the same time period, while those formulated from vinyl acrylics had completely eroded away after seven years of exterior weathering [Smith et al, 1993].…”

Section: Aspects Of Branched Vinyl Esters In Vinyl Latex Polymerizationmentioning

confidence: 96%

“…Branching and pendant length are also important for vinyl monomers. Accordingly, on a molar basis -: n-butyl acrylate < Neo 5 < vinyl 2-ethyl hexanoate ~ Neo 9 ~ Neo 10 in the resistance against alkali saponification of vinyl acetate/branched ester copolymers and vinyl acetate/branched ester/butyl acrylate terpolymer latexes at 2/1 vinyl acetate/branched ester molar ratios [Smith et al, 1993]. That Neo-5 provides lower protection than either Neo-9 and Neo-10 points to the importance of pendant chain length in enhancing hydrophobicity and alkali resistance (all three possesses dimethyl substituted (tertiary) alpha carbons).…”

Section: Aspects Of Branched Vinyl Esters In Vinyl Latex Polymerizationmentioning

confidence: 99%

“…Given that adjacent hydroxyl groups have been shown to promote hydrolysis of acetate moieties in partially hydrolyzed polyvinyl acetate, one would expect that any comonomer capable of separating the pendant acetate groups on the polymer backbone should effectively decrease the rate of saponification [Smith et al, 1993].…”

Section: Aspects Of Branched Vinyl Esters In Vinyl Latex Polymerizationmentioning

confidence: 99%

“…In other words, the comonomer would form a random copolymer with vinyl acetate, thereby separating the vinyl acetate moieties, which, in turn reduced the number and lengths of the vinyl acetate sequences, and thus the extent of hydrolysis. On the basis of this argument, ethylene is the co-monomer of choice because its low molecular weight allows for the maximum introduction of non-hydrolyzable segments on a per weight basis [Smith et al, 1993]. Contributing to ethylene's effectiveness is the fact that hydrocarbon segments tend to reduce water solubility, thus imparting greater hydrolytic stability.…”

Section: Aspects Of Branched Vinyl Esters In Vinyl Latex Polymerizationmentioning

confidence: 99%

See 3 more Smart Citations

Emulsion polymerization of ethylene-vinyl acetate-branched vinyl ester using a pressure reactor system

Tan¹

View full text Add to dashboard Cite

CHAPTER 1 INTRODUCTION 1.1 Overview 1 1.2 Motivation and objectives for this study CHAPTER 2 LITERATURE REVIEW 2.1 Relevance and motivations 4 2.2 Historical background of VAE pressure Latex 2.3 Review of patent literature on ethylene-based pressure latex 2.4 Typical monomer compositions used in pressure latexes 2.5 Plasticization of vinyl acetate 2.6 Comparison of ethylene vs. acrylates as co-monomer for vinyl acetate 2.7 Pressure emulsion polymerization techniques 2.8 Aspects of branched vinyl esters in vinyl latex polymerization 2.9 Physical properties of ethylene-based latex and analytical methods used ATTENTION: The Singapore Copyright Act applies to the use of this document. Nanyang Technological University Library iii CHAPTER 3 EXPERIMENTAL METHODS AND MATERIALS 3.1 Preparation of BEEVA latexes 3.1.1 Model BEEVA latexes 3.1.2 Materials used for synthesis of BEEVA latexes 3.1.3 Recipe for model BEEVA latexes 3.2 Preparation of samples 3.3 Rheological measurements 3.4 Contact angle measurements 69 3.5 Glass transition temperature measurements 3.6 Nuclear magnetic resonance (NMR) spectra measurements 70 3.7 Zeta potential and particle size measurements CHAPTER 4 DESIGN OF PRESSURE REACTOR SYSTEM 4.1 Design of pressure polymerization hardware 4.1.1 Pressure vessel 4.1.2 Agitator 4.1.3 Feed tanks and pumps 4.1.4 Haskel pump 4.1.5 Temperature control 4.1.6 Research motor valves 4.1.7 Monomer preparation system 4.2 Safety features 4.2.1 Safety devices ATTENTION: The Singapore Copyright Act applies to the use of this document. Nanyang Technological University Library iv 4.2.2 Effluent handling system CHAPTER 5 PHYSICAL PROPERTIES OF LATEXES 5.1 Introduction 5.2 Rheological properties 5.3 Determination of ethylene weight percentage using proton NMR 96 5.4 Glass transition temperature 5.5 Contact angle 5.6 Zeta potential and particle size CHAPTER 6 CONCLUSIONS AND RECOMMENDATIONS 6.1 Conclusions 6.1.1 The design of a new pressure reactor system 6.1.2 The preparation of model BEEVA latexes 6.1.3 The physical properties of model BEEVA latexes 6.2 Recommendations 123

show abstract

Section: Aspects Of Branched Vinyl Esters In Vinyl Latex Polymerizationmentioning

confidence: 96%

Section: Aspects Of Branched Vinyl Esters In Vinyl Latex Polymerizationmentioning

confidence: 99%

Section: Aspects Of Branched Vinyl Esters In Vinyl Latex Polymerizationmentioning

confidence: 99%

Section: Aspects Of Branched Vinyl Esters In Vinyl Latex Polymerizationmentioning

confidence: 99%

See 2 more Smart Citations

Emulsion polymerization of ethylene-vinyl acetate-branched vinyl ester using a pressure reactor system

Tan¹

View full text Add to dashboard Cite

show abstract

“…,001g/100g de água, respectivamente. Portanto, por serem pouco solúveis, estes monômeros dependem de emulsificantes para proporcionar estabilidade coloidal para suas gotas e para as partículas de polímero.Na polimerização em emulsão pode ocorrer limitação na difusão do monômero VeoVa-10 na fase aquosa desde as gotículas de monômero até as partículas de polímero, reduzindo assim a taxa de polimerização global ( )(BALIC et al 1997).A diferença de razão de reatividade entre um monômero éster vinílico e o estireno torna quase impraticável a copolimerização em emulsão, visto que haverá variação na composição do meio reacional.Visando evitar a coagulação das partículas de látex, faz-se necessário o uso de dois emulsificantes na formulação, sendo estes aniônico e não-iônico(SMITH et al, 1993). O emulsificante aniônico confere uma camada eletricamente carregada ao redor da superfície da partícula, causando a repelência destas partículas por meio de forças eletrostáticas.…”

unclassified

Copolimerização de estireno e VeoVa 10: determinação das razões de reatividade e estudo do processo de polimerização em emulsão.

Barbosa¹

View full text Add to dashboard Cite

In this work the reactivity ratios for the copolymerization between styrene and VeoVa-10 were determined through an experimental study of solution copolymerization in toluen. The parameters were obtained by fitting the experimental data with the Mayo-Lewis and Meyer-Lowry models using the error-in-variables criterion (non-linear least squares method that considers the existence of errors in all measured variables). The experimental methodology developed, solution polymerization in ampoules prepared in a glove box and reacted at 80 °C, resulted in low conversion of the monomers, suitable for estimation of the reactivity ratios by the models employed. The samples were analyzed quantitatively by infrared spectroscopy to determine, during the reaction, the conversion and the mole fractions of each monomer in the mixture, the composition of the copolymer being obtained by the consumption of the monomers. Very different reactivity ratios were obtained (rstyrene = 49.926 and rVeoVa10 = 1.062), showing that the batch copolymerization of these monomers leads to large composition drift, with a tendency to form two homopolymers. The same copolymerization system was also tested in emulsion polymerization process, in semicontinuous and intermittent batch modes. The overall conversion of the monomers and the mean particle diameter distribution were analyzed during the reaction through the samples collected throughout the process. The effects of the feeding strategies evaluated were only preliminary, as they did not present conclusive results.

show abstract

Hydrophobic coatings from emulsion polymers

Bassett¹

2001

J. Coatings Tech.

View full text Add to dashboard Cite

New vinyl ester monomers for emulsion polymers

Cited by 13 publications

References 1 publication

Emulsion polymerization of ethylene-vinyl acetate-branched vinyl ester using a pressure reactor system

Emulsion polymerization of ethylene-vinyl acetate-branched vinyl ester using a pressure reactor system

Copolimerização de estireno e VeoVa 10: determinação das razões de reatividade e estudo do processo de polimerização em emulsão.

Hydrophobic coatings from emulsion polymers

Contact Info

Product

Resources

About