Styrene--butyl Acrylate Copolymers

A prime example of these features can be found in the synthesis of styrene/ (meth)acrylate random copolymers. By controlling the initiator/total monomer ratio, the molecular weight can be accurately controlled for both styrene/methyl methacrylate and styrene/butyl acrylate random copolymers. As can be seen in Figure 2.3 the polydispersity for both systems is essentially 1.10-1.25 over comonomer ratios ranging from 1/9 to 9/1. 

J.A. Herbig and 1.0. Salyer, Binary blends of styrene/acrylonitrile copolymer and butyl acrylate/acry-lonitrile copolymer and methods for preparing the same, US Patent 3118855, assigned to Monsanto Chemicals, January 21,1964. 

Handel and co-workers [11] have investigated the influence of the polymerization conditions on the molecular weight and chemical composition of styrene-butyl acrylate copolymers ... 

Figure 7.1.9 Contour plot obtained for a typical GPC-NMR on-line coupling analysis of a styrene-butyl acrylate copolymer...

The cationic Surfmers produced much smaller particle sizes in the emulsion polymerization of styrene and styrene/butyl acrylate than the amphoterics (20-50 nm versus 100-300 nm). Some of the latter, however, conferred to the copolymer lattices stability to electrolytes and freeze-thaw [24]. Similar, but nonreactive surfactants produced from succinic anhydride gave similar stability but had much inferior water resistance [25]. 

Inaba et al. prepared a series of model styrene/butyl acrylate copolymer latexes with glass transition temperatures at room temperature. The functional monomer 2-(3-isopropenylphenyl)-2-methylethylisocyanate (TMI) was used as monomer/crosslinking agent for further film formation. A small amount of methacrylic acid was introduced in some formulations in order to enhance the crosslinking reaction. A redox initiation system was used to reduce premature crosslinking during the polymerization [82]. 

Addition of the XIII as a macroinitiator to styrene polymerization resulted in the formation of S-MMA-S triblock copolymer. The same procedure was also used to make styrene-butyl acrylate block copolymers. 

As a general statement, isomerizations occur much slower (around lOOtimes and more) in the film than in solution. It was already observed for azo compounds by Kamogawa et in the case of copolymers of 4-vinyl-4 -dimethylaminoazobenzene (I) with styrene and of 4-acryloylaminomethylaminoazobenzene (II) with styrene, butyl acrylate and methyl methacrylate. 

Plots of the relationship between the styrene content and retention volume for copolymers of styrene-acrylate and styrene-methacrylate with the same ester group lay roughly on the same line. This result indicates that a pair of copolymers with the same ester group and the same styrene content could not be separated (24), For example, copolymers of styrene-methyl acrylate and styrene-MMA with the same styrene content cannot be separated by this technique. In copolymers with the same styrene content, styrene-butyl acrylate and styrene-butyl methacrylate copolymers eluted first from a column, the copolymers of ethyl esters were next, and those of methyl esters eluted last. 

When styrene is eliminated from the monomer mix, there is an increase in conversion from 67 percent to 84 percent (D vs. C) with a corresponding decrease in the amount of unreacted VEC. Increasing the temperature from 100° to 120°C did not have a significant effect. Increasing the amount of butyl acrylate monomer relative to MMA improved the conversion (F), as did increasing the level of initiator (G). One of the better results we have been able to attain thus far is the copolymer with butyl acrylate (H), however, there is still some unreacted VEC present in the copolymer. 

Paints and coatings are based on polymers that can form a film. The polymer is considered the binder or vehicle that carries the pigments and additives that are used to impart color or protect the surface of the substrates on which the paint or coating is applied. Some examples of polymers used as paint base are copolymers of styrene-butyl acrylate or of acrylic monomer-vinyl acetate. In the product, the polymer is either finely dispersed in water forming a latex or dissolved in a solvent (in oil-based paints). Latexes for paints are usually produced by emulsion polymerization (Chapter 14). 

Acrylonitrile-styrene-acrylate (ASA) copolymers is another family of graft-copolymer-based materials in which the rubber phase is really a copolymer of butyl acrylate (BuA) and butadiene (at least in some recipes) [47, 48], and the matrix is made of a SAN copolymer. Originally, butadiene was not present in the rubber phase [49] and perhaps those were not really graft-copolymer-based materials. The main advantage of ASA over ABS is its increased UV stability and long-term heat resistance due to the lack of residual double bonds in the acrylate part of the rubber. 

Block copolymers of butyl acrylate-styrene and acrylonitrile-styrene have been prepared by irradiating butyl acrylate or acrylonitrile containing a photosensitive initiator (e.g., 1-azo-bis.l-cyanocyclo-hexane) with an intensive UV radiation. This creates a radical-rich monomer that when mixed with styrene yields the appropriate block copolymer. 

Glycidyl methacrylate copolymers Ethylene/butyl acrylate/maleic anhydride copolymers Styrene/ethylene-butylene/styrene block copolymer Poly(amide) (PA), MgO Silicone rubber and aminosilane Liquid crystalline polymers Improved impact strength Improved impact strength" Improved impact strength Improved electrical properties, in glass fiber applications" Improved mechanical properties" Viscosity reduction" ... 

Definition Copolymer of butyl acrylate and styrene monomers... 

Reactivity ratios exhibit a weak temperature dependence that is often difficult to measure. With increasing temperature, the ratios tend to approach unity as demonstrated for styrene-butyl acrylate [28], butyl acrylate-methyl methacrylate [29], and ethylene copolymer systems [30, 31]. The temperature dependencies of the latter values agree well with activation energies reported for addition of monomers to small radicals [32]. 

Emulsion polymerized copolymer of butyl acrylate, styrene, acrylic acid, and acrylamide Polyester Stainless steel 42 (24) [39] 190(39] 370 [39] ... 

The importance of restructuring on adhesion properties of polymers is the subject of a final illustration. This involves the peel strength of bonds made between a polymeric adhesive tape ( 3M manufacture) and supported films of styrene/butyl acrylate (S/BA) copolymers with mole ratio compositions of 98/2 and 93/7. Control specimens were made by casting the... 

Malilii, F.B. Kuo, C.Y. Provder, T. Determination of the absolute molecular weight of a styrene-butyl acrylate emulsion copolymer by low-angle laser light scattering (LALLS) and GPC/LALLS. J. Appl. Polym. Sci. 1984,29, 925. 

Inside the shell is a core of a more resilient, energy-absorbing polymer such as crosslinked polybutadiene, natural rubber, butadiene-styrene copolymer or butyl acrylate. The rubbery phase is thus prevented from mixing with the continuous phase (the polymer being toughened) and lowering its modulus. 

Styrene/butyl acrylate/acrylic acid copolymer 62/35/3... 

Strategies for controlling the copolymer composition and MWD of latices based on linear and non-linear copolymers, such as styrene/butyl acrylate copolymers and methyl methacrylate/n-butyl acrylate copolymers, are described. These strategies involve on-line procedures based on calorimetric measurements and open-loop processes employing a mathematical model for determining the trajectories of the manipulated variables, such as monomer feed flow rates and chain transfer agent. 35 refs. (3rd lUPAC-Sponsored International Symposium on Free-Radical Polymerization Kinetics and Mechanism, II Ciocco (Lucca), Tuscany, Italy, 3rd-9th June, 2001)... 

Journal of Applied Polymer Science 79, No.2,10th Jan.2001, p.333-6 PREPARATION AND PERFORMANCE IN PAPER COATING OF SILICONE-MODIFIED STYRENE-BUTYL ACRYLATE COPOLYMER LATEX... 

SiUcone-modified styrene-butyl acrylate copolymer latex was synthesised by emulsion copolymerisation using octamethylcyclotetrasiloxane(D4), styrene and butyl acrylate as raw materials, potassium persulphate as initiator and propylmethacrylate triethoxysilane as crosslinking agent. The IR spectroscopic studies showed that the vinyl monomers were completely copolymerised with D4. The prepared silicone-modified copolymer latex with the IPNs tended to have higher stability and better toluene and water resistance than styrene-butyl acrylate copolymer latex. The glossiness of coated paper was improved with silicone-modified copolymer latex and it was at a maximum when D4 was about 3% of total monomers. 16 refs. 

The composition and microstracture of polymers in a latex system were studied by pyrolysis gas chromatography. The composition and microstructure of a polymer in the emulsion phase were identified by direct pyrolysis of the latex system, followed by comparing the trimer peak pattern with appropriate microstructure standards. The polymer in the aqueous phase was pre-pyrolysis derivatised with tetrabutylammonium hydroxide to convert the acid to its butyl ester. Similar procedures were then used to explore the composition and microstructure of the polymer in the aqueous phase. Polymers analysed included SCX-2660 (probably a styrene-methyl methacrylate-butyl acrylate terpolymer), styrene-butyl acrylate copolymer and styrene-alpha-methylstyrene-butyl acrylate terpolymer. 17 refs. 

Polymers for Advanced Technologies 9, No. 12, Dec.1998, p.844-50 STUDY OF POLY(STYRENE/BUTYL ACRYLATE/METHACRYLIC ACID) COPOLYMER LATEXES WITH TRIMODAL PARTICLE SIZE DISTRIBUTION Fuxiang Chu Guillot J Guyot A CNRS-LCPP... 

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