Enhancement of Mechanical Properties of Emulsion Copolymers by Gradual Variation in Feed Composition. I: Effect of Particle Size in the Butyl Acrylate-Styrene System

Núñez-Pérez, Francisco A.; González-Ortiz, Luis J.; Toral, Fernando A. López-Dellamary; Jasso-Gastinel, Carlos F.

doi:10.1080/1023666x.2012.668656

Cited by 6 publications

(9 citation statements)

References 12 publications

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“…The mechanical properties of gradient copolymers have scarcely been investigated, likely due to the difficulty obtaining enough mass of material. Actually, most of them were prepared by solution polymerization in very small amounts . Matyjaszewski et al reported remarkably different mechanical behaviors between an ABA‐isolated structure and an ABA‐sequential structure (here A is methyl methacrylate and B is n ‐butyl acrylate).…”

Section: Introductionmentioning

confidence: 99%

Mechanical properties of gradient copolymers of styrene and n -butyl acrylate

Guo

Gao

Luo

2015

J. Polym. Sci. Part B: Polym. Phys.

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The mechanical properties of linear and V-shaped compositional gradient copolymer of styrene and n-butyl acrylate with composition of around 55 wt % styrene were investigated by comparing with their block copolymer counterparts. Compared with their block copolymer counterparts, the gradient copolymers showed lower elastic modulus, much larger elongation at break, and similar ultimate tensile strength at room temperature. This performance could be ascribed to that the local moduli continuously change from the hardest nanodomains to the softest nanodomains in the gradient copolymer, which alleviates the stress concentration during tensile test. Compared with the V-shaped gradient (VG) copolymer, the linear gradient copolymer showed much higher elastic modulus but lower elongation at break. The mechanical properties of the gradient copolymers were more sensitive to the change in temperature from 9 C to 75 C. With recovery temperature increased from 10 C to 60 C, the strain recovery of VG copolymer would change steadily from 40% to 99%. However, the elastic recovery of linear and triblock copolymer was poor even at 60 C. V C 2015 Wiley Periodicals, Inc. J. Polym.Sci., Part B: Polym. Phys. 2015, 53, 860-868

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Section: Introductionmentioning

confidence: 99%

Mechanical properties of gradient copolymers of styrene and n -butyl acrylate

Guo

Gao

Luo

2015

J. Polym. Sci. Part B: Polym. Phys.

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“…The relevance of the aforementioned principles for the properties contribution of the components that apply to the two copolymer synthesis methods just mentioned (i.e., FRP and RDRP), has been demonstrated by means of the similar results that have been obtained with both methods, evaluating dynamic properties for styrene-butyl acrylate copolymers [8,10] as well as for stress-strain behavior [16].…”

Section: Introductionmentioning

confidence: 78%

“…In fact, the great potential to design the properties of a copolymer using that method was demonstrated, disclosing the different types of stress-strain behavior that can be obtained by variations in the feeding profiles while maintaining constant the global copolymer composition [7]. Briefly, the high modulus along with significant values in ultimate deformation that can be obtained denote that a synergistic performance can be achieved with that methodology [8,9].…”

Section: Introductionmentioning

confidence: 99%

“…The evolution of chains' composition along conversion (for the FCC) was followed by proton nuclear magnetic resonance ( 1 H NMR). In those works, the structure-properties relationship was clearly disclosed, "building histograms" of the distribution of copolymer chain's composition contained in each polymer system [6][7][8]. In fact, the great potential to design the properties of a copolymer using that method was demonstrated, disclosing the different types of stress-strain behavior that can be obtained by variations in the feeding profiles while maintaining constant the global copolymer composition [7].…”

Section: Introductionmentioning

confidence: 99%

“…As an extension, looking for methods to improve properties in three-component polymers (TCPs), the strategy to force a variation in chains' composition along the reaction using FRP can also be applied to polymer systems with three components, where the instantaneous composition of the polymer chains can be adjusted by feeding co-monomeric pairs (e.g., feeding A and B monomers first and then monomers A and C for a three-component system) to avoid the well-known relative reactivity problems that arise if three or more monomers are fed simultaneously. The chains' composition along each copolymerization can be oriented, taking as a guide previous reports [7,8], using variations in feed composition of each comonomer system to be fed.…”

Section: Introductionmentioning

confidence: 99%

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A Methodology Towards Mechanical Properties Optimization of Three-Component Polymers by the Gradual Variation of Feed Composition in Semi-Continuous Emulsion-Free Radical Polymerization

et al. 2019

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In this work, a new methodology for the synthesis of three-component polymers (TCPs) was developed using a seeded, semi-continuous free-radical emulsion polymerization towards the optimization of the moduli–ultimate deformation performance and energy dissipation capacity for a styrene (S), n-butyl acrylate (BA), and 4-vinylbenzyl chloride (VBC) system. The three components were sequentially fed in pairs, varying feed composition along the conversion using S as the common monomer. To prepare a reference material, an industrial method was utilized with those monomers, using an equivalent global composition in a two-stage batch process (TS). Nanophase formation in the particles was observed by transmission electron microscopy (TEM), while the separation of the phases in the solid samples was observed by atomic force microscopy (AFM). The changes in glass transition temperature were determined by differential scanning calorimetry (DSC) and dynamic mechanical analysis (DMA). The latter was primarily used to compare mechanodynamic properties as a function of temperature for the two synthesis methods used. Thus, the higher toughness of the forced composition three-component polymeric materials was evaluated by means of their energy dissipation capacity, toughness, and stress–strain measurements at several temperatures.

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