The glass transition temperatures of homogeneous blends of polystyrene, poly(methyl methacrylate), and copolymers of styrene and methyl methacrylate

Braun, Dietrich; Kohl, P. R.; Hellmann, G. P.

doi:10.1002/macp.1988.021890721

Cited by 11 publications

(8 citation statements)

References 21 publications

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“…Each has a sharp peak in the glass transition region, all with widths of about 10 K. When the fraction of MMA units increased from 0 to 100% in the copolymers, the T g went down a little at first and then went up to 125 °C for homo-PMMA. This behavior is similar to that previously reported. , Generally, the T g of PMMA is in the range 105−128 °C, depending on the tacticity. Free radical propagation typically gives predominantly syndiotactic segments, and the T g of syndiotactic PMMA is about 130 °C .…”

Section: Resultssupporting

confidence: 92%

“…Combinations of monomers like styrene (S) and methyl methacrylate (MMA) may be varied in composition to fine-tune the surface interactions. It has been shown that the bulk T g , and the adsorbed amounts from solutions , of PS- r -PMMA copolymer depend on monomer composition. A variation in the monomer composition allowed Tsui et al to control the surface energy of PS−PMMA copolymer films.…”

Section: Introductionmentioning

confidence: 99%

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Modulated Differential Scanning Calorimetry of Ultrathin Adsorbed PS-r-PMMA Copolymers on Silica

Zhang

Blum

2003

Macromolecules

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A series of polystyrene-random-poly(methyl methacrylate) (PS-r-PMMA) copolymers with different compositions, adsorbed from toluene onto silica, were studied with modulated differential scanning calorimetry (MDSC). The equilibrium adsorbed amount increased monotonically with an increase in the methyl methacrylate (MMA) content in the copolymers. From the derivative MDSC curves, dCp/ dT vs T, the thermal transitions of the adsorbed chains were found to be dependent on the composition of the copolymers and representative of films with chain segments which were spatially heterogeneous. The intensities of the thermal transitions associated with more-mobile fractions in the polymer films decreased, and those associated with the more-rigid fractions increased when the MMA content in the copolymers increased. These changes were attributed to the strong interaction between MMA units and silanol groups on the silica surface. In addition, for the polymers studied, the relative intensities of the transitions associated with the more-mobile segments increased with increases in the adsorbed amounts.

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Section: Resultssupporting

confidence: 92%

Section: Introductionmentioning

confidence: 99%

Modulated Differential Scanning Calorimetry of Ultrathin Adsorbed PS-r-PMMA Copolymers on Silica

Zhang

Blum

2003

Macromolecules

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“…(The unusual behavior of the glass transition of the copolymer-copolymer blends is described in Ref. 31.) The Flory-Huggins parameters XFH of the copolymers with solvents used in the miscibility analysis were determined by light scattering in dilute solutions (Fig.…”

Section: Polymersmentioning

confidence: 99%

Miscibility of poly (styrene‐co‐methylmethacrylate)s differing in composition

Kohl

Seifert

Hellmann

1990

J Polym Sci B Polym Phys

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SynopsisThe mutual miscibility of random poly( styrene-co-methylmethacry1ate)s with different compositions hut a constant molecular weight of M , 150,000 was studied at room temperature and at 180°C. Compatibility was analyzed with films cast from solutions with different solvents. The reliability of the analytical technique is discussed. The miscibility windows { x , y , } , which define the limits of miscibility of the blends of a given copolymer P(S,MMAI-,) with other copolymers P (S,MMA,,), were determined for all x. The widths I xy z I of these windows are, contrary to the predictions of the Flory-Huggins model, different for yx > x and yx < z, and depend strongly on x . Miscibility is better for blends with a high MMA content. The windows are markedly wider at room temperature. Many blends are, therefore, "semicompatible," i.e., have a critical point of the LCST type between room temperature and 180°C.

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“…S1). In general, The T g of PMMA range from about 100 to 128 °C; the range is so wide because of the commercial PMMA compositions which are copolymers with comonomers other than methyl methacrylate. The addition of MA decreases the T g of pM from approximately 127.2 to 124.6 °C, and the addition of MA/CTA decreases the T g to approximately 122.2 °C.…”

Section: Resultsmentioning

confidence: 99%

Controllable synthesis of silica nanoparticle size and packing efficiency onto PVP‐functionalized PMMA via a sol–gel method

Kim

Hwang

Kang

et al. 2020

Journal of Polymer Science

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This study aimed to investigate synthesis and adsorption behavior of silica nanoparticles onto polyvinylpyrrolidone (PVP)‐functionalized poly(methyl methacrylate) under various conditions such as methanol/water ratio, ammonium hydroxide concentration, polymer contents, tetraethylorthosilicate contents, and total volume of solvent via sol–gel method. First, the copolymerization of methyl acrylate as a comonomer and 1‐dodecanethiol as a chain transfer agent increased the thermal stability of the product; however, the uniformity of the PMMA particles decreased because of the chain transfer reaction. Second, the adsorption behavior and size of silica nanoparticles could be controlled by adjusting the silica synthesis conditions. The adsorbed silica particle size was greatly influenced by the ammonium hydroxide concentration and the addition of water further enhanced the size increase. However, increasing the water content reduced the packing efficiency of the adsorbed silica particles. Increasing the PVP‐functionalized PMMA content at a fixed TEOS content linearly decreased the silica particle size. But TEOS concentration did not significantly affect the silica particle size. © 2020 Wiley Periodicals, Inc. J. Polym. Sci. 2020, 58, 662–672

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The glass transition temperatures of homogeneous blends of polystyrene, poly(methyl methacrylate), and copolymers of styrene and methyl methacrylate

Cited by 11 publications

References 21 publications

Modulated Differential Scanning Calorimetry of Ultrathin Adsorbed PS-r-PMMA Copolymers on Silica

Modulated Differential Scanning Calorimetry of Ultrathin Adsorbed PS-r-PMMA Copolymers on Silica

Miscibility of poly (styrene‐co‐methylmethacrylate)s differing in composition

Controllable synthesis of silica nanoparticle size and packing efficiency onto PVP‐functionalized PMMA via a sol–gel method

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