Spherulite Structure in Compatible Mixtures of Poly(ε-caprolactone) and Poly(vinyl chloride)

Nojima, Shuichi; Watanabe, Kazuya; Zheng, Zhaohui; Ashida, Tamaichi

doi:10.1295/polymj.20.823

Cited by 26 publications

(13 citation statements)

References 5 publications

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“…30, No. 4,1998 appeared in our case. To verify the specific interaction in PBSU/PVDF blends, further studies on the miscibility of various blends of biodegradable polyesters with vinylidene halides are now in progress.…”

Section: Specific Interaction In the Blendssupporting

confidence: 48%

Miscibility and Crystallization Behavior of Poly(butylene succinate) and Poly(vinylidene fluoride) Blends

Lee

Tazawa

Ikehara

et al. 1998

Polym J

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ABSTRACT:Miscibility and crystallization behavior of biodegradable poly(butylene succinate) (PBSU) and poly(vinylidene fluoride) (PVDF) blends, where two components are crystallizable have been investigated by differential scanning calorimerty and optical microscopy. From cloud point observation of the blends they are found to have lower critical solution temperature behavior. Spherulites of PVDF grew linearly with crystallization time and the growth rate decreased with increase in PBSU content The interaction parameter x, 2 , obtained from melting point depression of PVDF gave the value of -0. 139. However,

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Section: Specific Interaction In the Blendssupporting

confidence: 48%

Miscibility and Crystallization Behavior of Poly(butylene succinate) and Poly(vinylidene fluoride) Blends

Lee

Tazawa

Ikehara

et al. 1998

Polym J

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“…The spherulites with the banded structure are frequently reported for completely miscible blends consisting of crystalline/amorphous homopolymers [30][31][32][33] and microphase-separated crystalline-amorphous diblock copolymers. 34,35 In particular, PCL-b-PB forms regularly banded spherulites at any composition and T c , 34 in which amorphous PB blocks covalently linked with PCL blocks can intimately interact with PCL blocks during crystallization though the repulsive interaction works between PCL and PB blocks.…”

Section: Overview Of Crystallization Process Observed By Pommentioning

confidence: 92%

Temperature Dependence of Crystallization Behavior in a Phase-Separated Blend of Poly(ε-caprolactone) Homopolymer and Poly(ε-caprolactone)-block-Polybutadiene Copolymer

Akaba

Nojima

2006

Polym J

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ABSTRACT:The crystallization behavior in a macroscopically phase-separated blend consisting of poly("-caprolactone) homopolymer (PCL) and PCL-block-polybutadiene copolymer (PCL-b-PB) is investigated both by synchrotron small-angle X-ray scattering (SR-SAXS) and polarized optical microscope (POM) as a function of crystallization temperature T c . The characteristic size of the phase-separated structure existing in this blend before crystallization can arbitrarily be controlled by changing the phase separation time. When the blend with ¼ 2:5 mm is quenched into various T c , two scattering peaks are observed in the SR-SAXS curve during crystallization, which arise from the crystallized PCL and PCL-b-PB regions. The growth rates of these scattering peaks are identical at lower T c ( 35 C), while they deviate gradually with increasing T c . Only one type of spherulites is observed for the blend with ¼ 10 mm crystallized at T c ¼ 35C to give a single growth rate, while two different types of spherulites appear at higher T c (! 40 C)and their growth rates are significantly different. Therefore the T c dependence of crystallization behavior observed by POM is qualitatively similar to that obtained by SR-SAXS, though is moderately different between both cases.[doi:10.1295/polymj.PJ2005148] KEY WORDS Binary Blend / Phase-separated Structure / Crystallization / Small-angle X-ray Scattering / Optical Microscopy / Morphology formation in polymer blends is sometimes driven by a combined effect of the liquid-liquid phase separation between components and the crystallization of constituent polymers. The mechanism of such morphology formation has been studied by many groups for crystalline/amorphous polymer blends with an UCST-or LCST-type phase-separated region.1-18 For example, we have previously investigated the crystallization process in a binary blend of poly("-caprolactone) homopolymer (PCL, crystalline) and polystyrene oligomer (PSO, amorphous) by timeresolved small-angle X-ray scattering with synchrotron radiation (SR-SAXS), 2,6,7 where this blend had an UCST-type phase separation between PCL and PSO at the same temperature range of PCL crystallization. The process of morphology formation was considerably complicated, and the system consisted of two regions, amorphous region mainly made of PSO and crystallized region consisting of PCL lamellae and amorphous layers, at all times during morphology formation even for the blend without any phase separation before crystallization. In these studies, we could get SAXS peak from the crystallized region but not from the amorphous region since the crystallized region had a definite structure inside, and accordingly we obtained information on the morphology formation only from the crystallized region.Therefore we believe that crystalline/crystalline polymer blends have a potential advantage to investigate the complicated morphology formation, because two kinds of crystallization behavior might be observed simultaneously to get more information on the morphology formation. However ...

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“…With increasing PVB concentration in same results were reported by other researchers PCL/PVB blends, the band spacing decreased, using the PCL/PVC system. 18,19 The cause of the whereas the intensity of PTC increased. Band drastic changes in PTC property of the PCL/PVB spacing of the blends also decreased with the moblend with varying PVB content will be discussed lecular weight of PVB at the constant blend comin the next section.…”

Section: Influence Of Pvb Concentrationmentioning

confidence: 99%

Morphology and electrical properties of carbon black‐filled poly(ε‐caprolactone)/poly(vinyl butyral) blends

Lee

Ikehara

Nishi

1998

J of Applied Polymer Sci

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Electrical properties of poly( 1-caprolactone) (PCL)/poly(vinyl butyral) (PVB) blends containing carbon black (CB) were studied as a function of a small amount of PVB content and a wide range of molecular weight of PVB. For samples with the same CB content, the intensity of positive temperature coefficient ( I PTC , defined as the ratio of peak resistivity to resistivity at room temperature) of the blends was increased, with PVB content greatly and molecular weight of PVB weakly. As the band spacings of PCL spherulites in PCL/PVB blends decrease with PVB content and molecular weight of PVB, the changes of the positive temperature coefficient property are ascribed to the morphological difference (i.e., period of twisted lamellae) in the blends. We confirmed our previous conclusion that the origin of the positive temperature coefficient phenomenon is the changes of the distribution of the CB on the melting of the crystalline phase.

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Spherulite Structure in Compatible Mixtures of Poly(ε-caprolactone) and Poly(vinyl chloride)

Cited by 26 publications

References 5 publications

Miscibility and Crystallization Behavior of Poly(butylene succinate) and Poly(vinylidene fluoride) Blends

Miscibility and Crystallization Behavior of Poly(butylene succinate) and Poly(vinylidene fluoride) Blends

Temperature Dependence of Crystallization Behavior in a Phase-Separated Blend of Poly(ε-caprolactone) Homopolymer and Poly(ε-caprolactone)-block-Polybutadiene Copolymer

Morphology and electrical properties of carbon black‐filled poly(ε‐caprolactone)/poly(vinyl butyral) blends

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