Isotactic polystyrene/poly(vinyl methyl ether) blends: miscibility, crystallization and phase structure

Amelino, L.; Martuscelli, E.; Sellitti, C.; Silvestre, Clara

doi:10.1016/0032-3861(90)90252-t

Cited by 28 publications

(11 citation statements)

References 15 publications

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“…Increases in spherulite growth rates have instead been detailed for a few miscible blends . Remarkable examples are blends of isotactic or syndiotactic poly(styrene) with poly(vinyl methyl ether) , poly(vinylidene fluoride) with poly(1,4‐butylene adipate) , and PLA with poly(ethylene oxide) . In all these miscible blends, the glass transition of the noncrystallizable component is lower than that of the crystallizable polymer, which results in a progressive decrease of T g with the content of the amorphous polymer.…”

Section: Resultsmentioning

confidence: 99%

Peculiar crystallization kinetics of biodegradable poly(lactic acid)/poly(propylene carbonate) blends

Lorenzo

Ovyn

Malinconico

et al. 2015

Polymer Engineering & Sci

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Binary blends of poly(lactic acid) (PLA) and poly(propylene carbonate) (PPC) were found to display a peculiar crystallization kinetics. The two biodegradable polymers were blended by melt mixing, to obtain binary blends at various compositions. Temperature‐modulated calorimetry and dynamic‐mechanical analysis indicated that the blend components are partially miscible, and display two separate glass transitions, at temperatures intermediate to those of the plain polymers. Electron microscopy analysis disclosed the morphology of PLA/PPC blends, made of PPC‐rich particles finely dispersed within the PLA‐rich matrix. The possible establishment of interactions between the functional groups of the two polymers upon melt mixing has been hypothesized as the reason for partial miscibility and compatibility of the two biodegradable polymers. The PLA/PPC blends display good mechanical properties, with enhanced performance at rupture compared with plain PLA. Most importantly, the addition of PPC affects also the crystallization kinetics of PLA, since the more mobile PPC chains favor diffusion of the stiffer PLA chain segments towards the growing crystals, which fastens the spherulite growth rate of PLA. Such positive influence of an amorphous polymer on crystal growth rate has been demonstrated here for the first time in blends that display phase‐separation in the melt. POLYM. ENG. SCI., 55:2698–2705, 2015. © 2015 Society of Plastics Engineers

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Section: Resultsmentioning

confidence: 99%

Peculiar crystallization kinetics of biodegradable poly(lactic acid)/poly(propylene carbonate) blends

Lorenzo

Ovyn

Malinconico

et al. 2015

Polymer Engineering & Sci

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“…Martuscelli et al reported that the radial growth rates of miscible blends of isotactic i-PS with poly(vinyl methyl ether) (PVME) are higher than neat i-PS, and increases with the PVME content in the blend. 19 Note that in Martuscelli's study, PVME possesses a low T g of Ϫ30°C. The activation free energy (⌬E) is supposed to be different depending on the T g of the miscible polymer component to be blended with s-PS.…”

Section: Radial Growth Ratesmentioning

confidence: 96%

Polymorphic crystal forms and morphology of syndiotactic polystyrene in miscible states

Woo

1998

J. Polym. Sci. B Polym. Phys.

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“…The interaction in this case is between the electrons of the ether groups and the aromatic polystyrene ring. In fact, PMVE can function as a diluent for isotactic polystyrene enhancing spherulite formation (72). Depending on the molecular weight and tacticity of the PMVE employed, separated regions of crystallized PMVE can function as reinforcement for polystyrene blends and offer improved plastic properties (73).…”

Section: Polymer-polymer Compatibilitymentioning

confidence: 99%

Vinyl Ether Monomers and Polymers

2000

Kirk-Othmer Encyclopedia of Chemical Technology

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The history of vinyl ether homopolymers has been more involved with the progress of polymer science than in the generation of highly successful commercial products. The reason appears to be economic, as less‐expensive monomers such as acrylic and vinyl ester types have dominated end‐use polymer technologies. Copolymers of methyl vinyl ether, especially with maleic anhydride, continue to be important in personal care and pharmaceutical markets. The polymerization of vinyl ethers, because of the strong electron‐donating oxygen, can be readily accomplished with cationic initiators to produce polymers and copolymers having the potential for significant variety. Only poly(methyl vinyl ether), however, achieved commercial success among the homopolymers, though its commercial importance has faded. Divinyl ethers are emerging as important ingredients in radiation‐cured coatings because they are more insensitive than acrylates to atmospheric oxygen present during cationic polymerization. Copolymers based on methyl vinyl ether/maleic anhydride, easily prepared by free‐radical initiation, continue to hold academic interest. The observation in 1949 that isobutyl vinyl ether can be polymerized with stereoregularity ushered in the stereochemical study of polymers, eventually leading to the development of stereoregular polypropylene. In fact, vinyl ethers were key monomers in the early polymer literature. Academic interest in living cationic polymerization and in the unusual compatibility of poly(methyl vinyl ether) with polystyrene continue to demonstrate that vinyl ether‐containing polymers are still valuable for contemporary interest.

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Isotactic polystyrene/poly(vinyl methyl ether) blends: miscibility, crystallization and phase structure

Cited by 28 publications

References 15 publications

Peculiar crystallization kinetics of biodegradable poly(lactic acid)/poly(propylene carbonate) blends

Peculiar crystallization kinetics of biodegradable poly(lactic acid)/poly(propylene carbonate) blends

Polymorphic crystal forms and morphology of syndiotactic polystyrene in miscible states

Vinyl Ether Monomers and Polymers

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