Compatibility of poly(ϵ‐caprolactone) (PCL) and poly(styrene‐co‐acrylonitrile) (SAN) blends. II. The influence of the AN content in SAN copolymer upon blend compatibility

Chiu, S. C.; Smith, Theodore G.

doi:10.1002/app.1984.070290532

Cited by 93 publications

(68 citation statements)

References 17 publications

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“…For example, Janarthanan et al (1993) have used Fourier transform infrared spectroscopy to detect intramolecular interaction in blends of poly(ecapro1actone) and poly(styrene-co-acrylonitrile). This system displays a miscibility window as a function of copolymer composition (Chiu and Smith, 1984). The shift of the y-CH outof-plane deformation band of styrene to higher frequencies shows that miscibility in this system is mainly due to the dilution of the unfavorable intramolecular interaction between styrene and acrylonitrile segments by poly(&-caprolactone).…”

Section: Introductionmentioning

confidence: 90%

Vapor-liquid equilibria for copolymer/solvent systems: Effect of “intramolecular repulsion”

Gupta¹,

Prausnitz²

1996

Fluid Phase Equilibria

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The role of intramolecular interactions in blend miscibility is well documented for polymer+copolymer mixtures (ten Brinke et al., 1983;Paul and Barlow, 1984). Some copolymer+polymer mixtures are miscible although their corresponding homopolymers are not miscible; for example, over a range of acrylonitrile content, styrene/acrylonitrile copolymers are miscible with poly(methy1 methacrylate) but neither polystyrene nor polyacrylonitrile is miscible with poly(methy1 methacrylate). Similarly, over a composition range, butadiendacrylonitrile copolymers are miscible with poly(viny1 chloride) while none of the binary combinations of the homopolymers [polybutadiene, polyacrylonitrile, and poly(viny1 chloride)] are miscible. This behavior has been attributed to "intramolecular repulsion" between unlike copolymer segments.We have observed similar behavior in vapor-liquid equilibria (VLE) of copolymer+solvent systems. We find that acrylonitrile/butadiene copolymers have higher affmity for acetonitrile solvent than do polyacrylonitrile or polybutadiene. We attribute this non-intuitive behavior to "intramolecular repulsion" between unlike segments of the copolymer. This repulsive interaction is weakened when acetonitrile molecules are in the vicinity of unlike copolymer segments, favoring copolymer+solvent miscibility. We find similar behavior when acetonitrile is replaced by methyl ethyl ketone. To our best knowledge, this effect has not been reported previously for VLE. We have obtained VLE data for mixtures containing a solvent and a copolymer as a function of copolymer composition. It appears that, at a given solvent partial pressure, there may be copolymer composition that yields maximum absorption of the solvent. This highly non-ideal VLE phase behavior may be useful for optimum design of a membrane for a separation process.

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Section: Introductionmentioning

confidence: 90%

Vapor-liquid equilibria for copolymer/solvent systems: Effect of “intramolecular repulsion”

Gupta¹,

Prausnitz²

1996

Fluid Phase Equilibria

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“…[14] Numerous studies have been carried out to modify PCL by blending or co-polymerization with other polymers. [15][16][17][18][19][20][21][22][23][24][25] In the case of PCL/SAN blend, the miscibility of this system and the influence of acrylonitrile (AN) content in the copolymer upon blend miscibility have been studied by Chiu et al [20] They found that SAN and PCL are miscible when the AN content in SAN ranges from 8 to 28 wt.-%. Savoboda et al [21,22] studied the morphology of PCL/SAN blend via competition with spinodal decomposition.…”

Section: Introductionmentioning

confidence: 99%

Isothermal Crystallization of Poly(ε‐caprolactone) in Blend with Poly(styrene‐co‐acrylonitrile): Influence of Phase Separation Process

Madbouly

Ougizawa

2004

Macro Chemistry & Physics

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Summary: The isothermal crystallization process of poly(ε‐caprolactone) (PCL) and its blend with styrene‐acrylonitrile random copolymer containing 27.5 wt.‐% acrylonitrile has been investigated as a function of crystallization and melting temperatures for different melting times in the vicinity of the lowest critical solution temperature (LCST)‐type phase diagram using DSC. The obtained results showed that the isothermal crystallization kinetics from the melt of PCL in the blend was greatly affected by the presence of SAN. For a given crystallization temperature, the crystallization half time (t0.5) in the case of PCL/SAN = 80/20 blend was much longer than the corresponding value for pure PCL. This depression in the crystallization kinetics of PCL in the blend was mainly attributed to the favorable interaction between the two components and the reduction in chain mobility as a result of increasing the Tg by adding the amorphous component (SAN). In addition, the value of t0.5 was found to be independent of the melting temperature (Tm) and melting time for pure PCL. The isothermal crystallization kinetics for samples that were crystallized after decomposition into different stages of phase separation were also investigated. A major acceleration in the crystallization kinetics was observed isothermally for the samples that had undergone phase separation in the early and middle stages. The isothermal crystallization kinetics was also analyzed based on the Avrami approach. Although the crystallization kinetics was accelerated to a great extent by the liquid‐liquid phase separation, no change in the crystallization mechanism could be predicted. Furthermore, the phase separation process of PCL/SAN blend has been studied indirectly by following the variation in t0.5 at different melting temperatures and melting times above the LCST phase diagram.

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“…Therefore, it is very imethylene-propylene-diene terpolymer. portant for the development of rubber-modified SAN can readily blend with a number of other polymers to find how to improve the impact polymers including poly(1-caprolactone), 3,4 polystrength without deterioration of the other propcarbonate, [5][6][7][8][9] poly(vinylidenefluoride), 10 nylon, …”

Section: Introductionmentioning

confidence: 99%

Effect of the type of SAN in SAN/CPE blend: Morphology, mechanical, and rheological properties

Hwang

Kim

1998

J. Appl. Polym. Sci.

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ABSTRACT:The effect of the molecular weight and acrylonitrile (AN) content of the styrene-acylonitrile copolymer (SAN) on the morphology, mechanical, and rheological properties of SAN/chlorinated polyethylene (CPE) blends was studied. The interaction between dispersed particle and matrix is expected to be optimal at the 25% AN content of SAN. Phase inversion from a dispersion to a continuous phase appears to occur above 50 wt % CPE. Mechanical properties increased with molecular weight at a constant AN content of SAN. Morphological, mechanical, and rheological properties were more sensitive to the AN content, rather than the molecular weight of SAN.

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Compatibility of poly(ϵ‐caprolactone) (PCL) and poly(styrene‐co‐acrylonitrile) (SAN) blends. II. The influence of the AN content in SAN copolymer upon blend compatibility

Cited by 93 publications

References 17 publications

Vapor-liquid equilibria for copolymer/solvent systems: Effect of “intramolecular repulsion”

Vapor-liquid equilibria for copolymer/solvent systems: Effect of “intramolecular repulsion”

Isothermal Crystallization of Poly(ε‐caprolactone) in Blend with Poly(styrene‐co‐acrylonitrile): Influence of Phase Separation Process

Effect of the type of SAN in SAN/CPE blend: Morphology, mechanical, and rheological properties

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