Blends of polycarbonate and acrylic polymers: Crystallization of polycarbonate

Debier, D.; Jonas, Alain M.; Legras, Roger

doi:10.1002/(sici)1099-0488(19980915)36:12<2197::aid-polb17>3.0.co;2-v

Cited by 27 publications

(15 citation statements)

References 39 publications

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“…This phenomenon arises from the poor mobility of the amorphous polymer chains with a similar or higher T g than the T c of the second crystallizable polymer component. [13] On the contrary, when the T c becomes higher than the T g of the noncrystallizable component, the mobility of the latter increases and this component tends to be rejected into the inter-fibrillar or inter-spherulitic zones. As detected above by DSC, catechin in the amorphous state have a glass transition located at 124 8C, which arises from its strong self-association.…”

Section: Lamellar Morphologymentioning

confidence: 99%

“…Kinetically, the chain mobility may be also an important factor. [12,13] If the diffusion rate is slower than the crystal growth rate, resulting from the poor chain mobility of diluent, diluent molecules may be trapped inside the inter-lamellar regions before they had a chance to diffuse out. Talibuddin et al [14] have considered the roles of both intermolecular interaction and diluent's T g on the segregation distance.…”

Section: Introductionmentioning

confidence: 99%

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Hydrogen‐Bonding Interaction and Crystalline Morphology in the Binary Blends of Poly(ε‐caprolactone) and Polyphenol Catechin

Zhu

et al. 2003

Macromolecular Bioscience

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The specific intermolecular hydrogen‐bonding interaction between the ester carbonyl groups of poly(ε‐caprolactone) (PCL) and the phenolic hydroxyl groups of catechin has been studied by Fourier‐transform infrared spectroscopy (FT‐IR) and differential scanning calorimetry (DSC). According to quantitative curve‐fitting analysis of the FT‐IR spectra of PCL/catechin blends, it was found that the fraction of hydrogen‐bonded carbonyl groups of PCL increased with catechin content, while that of hydrogen‐bonded hydroxyl groups of catechin decreased. The calculated crystallinity of PCL in the binary blends, based on the curve‐fitting results, suggested that the crystallization of PCL was restrained in the blends with catechin. Only single glass transition temperature, Tg, was observed over the whole range of blend compositions, which was between those of the pure components. The melting point, Tm, depressed and Tg increased, indicating also the existence of strong intermolecular association. The blend composition dependence of Tg could be predicted very well by the Kwei equation with a positive ‘q’ value of 124. With the aid of small angle X‐ray scattering measurement, the segregation of catechin was investigated. It was found that the extent of extra‐lamellar segregation increased with catechin content. It was suggested that the crystal growth rate played the dominant role in the formation of morphology. With decreasing crystal growth rate of PCL component in the blends, enough time has been given to catechin molecules to diffuse into extra‐lamellar region.

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Section: Lamellar Morphologymentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Hydrogen‐Bonding Interaction and Crystalline Morphology in the Binary Blends of Poly(ε‐caprolactone) and Polyphenol Catechin

Zhu

et al. 2003

Macromolecular Bioscience

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“…Furthermore such systems offer an opportunity to learn more about the occurrence of nonequilibrium phenomena in mixtures containing crystallizable components. The freezing in of intermediate states during the 16.04.03 approach of equilibria is well documented for polymer blends of semi-crystalline and amorphous components in general [1][2][3][4][5][6][7][8][9][10][11][12][13] and with PEO as one component in particular [14][15][16][17][18][19] . Analogous investigations for the considerably less viscous solutions of such polymers (which should therefore be less prone to non-equilibria phenomena) are to our knowledge lacking.…”

Section: Introductionmentioning

confidence: 99%

PEO/CHCl₃. Crystallinity of the Polymer and Vapor Pressure of the Solvent. Equilibrium and Nonequilibrium Phenomena

Khasanova

Wolf

2003

Macromolecules

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Vapor pressures were measured for the system CHCl 3 /PEO 1000 (PEO stands for polyethylene oxide and 1000 for M w in kg/mol) at 25 °C as a function of the weight fraction w of the polymer by means of a combination of head space sampling and gas chromatography. The establishment of thermodynamic equilibria was assisted by employing thin polymer films. The degrees of crystallinity α of the pure PEO and of the solid polymer contained in the mixtures were determined via DSC. An analogous degree of polymer insolubility β was calculated from the vapor pressures measured in this composition range. The experiments demonstrate that both quantities and their concentration dependence are markedly affected by the particular mode of film preparation. These non-equilibrium phenomena are discussed in terms of frozen local and temporal equilibria, where differences between α and β are attributed to the occlusion of amorphous material within crystalline domains. Equilibrium information was obtained from two sources, namely from the vapor pressures in the absence of crystalline material (gas/liquid) and from the saturation concentration PEO (liquid/solid). The thermodynamic consistency of these data is demonstrated using a new approach that enables the modeling of composition dependent interaction parameters by means of two adjustable parameters only.

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“…It has also been pointed out that a greater diffusivity of the diluents in polymers or slower crystal growth may lead to a more significant segregation distance 14. 15…”

Section: Introductionmentioning

confidence: 99%

Influence of molecular interactions on spherulite morphology in miscible poly(ethylene oxide)/epoxy network versus poly(ethylene oxide)/poly(4‐vinyl phenol) blend

Huang

Kuo

Woo

2001

Polymer International

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Relationships between the spherulite morphology and changes in hydrogen‐bonding interactions between the linear poly(ethylene oxide) (PEO) polymer and a crosslinking epoxy system (diglycidylether of bisphenol‐A resin with 4,4′‐diaminodiphenylsulfone) (DGEBA/DDS) before and after cure have been explored The hydrogen‐bonding interaction is more significant before cure because of the interactions between the ether group of PEO and the amine group of DDS. The interaction between PEO and epoxy/DDS becomes less in the cured network. The morphology of the PEO crystals is, in turn, affected by the contents and chemical structures (functional groups, molecular weights, crosslinks, etc) of crosslinking epoxy/DDS. PEO/poly(4‐vinyl phenol) (PVPh), a thermoplastic non‐curing miscible system with the hydrogen bonding between the ether group of PEO and the OH group of PVPh, is also compared. In comparison with the PEO/epoxy/DDS system, the spherulite morphology of PEO/PVPh becomes more extensively spread out, with the extents increasing with the PVPh contents in the PEO/PVPh blend. © 2001 Society of Chemical Industry

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Blends of polycarbonate and acrylic polymers: Crystallization of polycarbonate

Cited by 27 publications

References 39 publications

Hydrogen‐Bonding Interaction and Crystalline Morphology in the Binary Blends of Poly(ε‐caprolactone) and Polyphenol Catechin

Hydrogen‐Bonding Interaction and Crystalline Morphology in the Binary Blends of Poly(ε‐caprolactone) and Polyphenol Catechin

PEO/CHCl₃. Crystallinity of the Polymer and Vapor Pressure of the Solvent. Equilibrium and Nonequilibrium Phenomena

Influence of molecular interactions on spherulite morphology in miscible poly(ethylene oxide)/epoxy network versus poly(ethylene oxide)/poly(4‐vinyl phenol) blend

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Blends of polycarbonate and acrylic polymers: Crystallization of polycarbonate

Cited by 27 publications

References 39 publications

Hydrogen‐Bonding Interaction and Crystalline Morphology in the Binary Blends of Poly(ε‐caprolactone) and Polyphenol Catechin

Hydrogen‐Bonding Interaction and Crystalline Morphology in the Binary Blends of Poly(ε‐caprolactone) and Polyphenol Catechin

PEO/CHCl3. Crystallinity of the Polymer and Vapor Pressure of the Solvent. Equilibrium and Nonequilibrium Phenomena

Influence of molecular interactions on spherulite morphology in miscible poly(ethylene oxide)/epoxy network versus poly(ethylene oxide)/poly(4‐vinyl phenol) blend

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Product

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About

PEO/CHCl₃. Crystallinity of the Polymer and Vapor Pressure of the Solvent. Equilibrium and Nonequilibrium Phenomena