Crystallization behavior of poly(ϵ‐caprolactone) in poly(ϵ‐caprolactone) and poly(vinyl methyl ether) mixtures

Meng, Yanfeng; Li, Hongfei; Huo, Hong; Jiang, Shichun; An, Lijia

doi:10.1002/app.26241

Cited by 7 publications

(4 citation statements)

References 43 publications

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“…In miscible blends, the presence of the noncrystallizable component strongly influences the crystallization behavior of PCL and the resulting morphology. As previously reported, ,− the spherulitic growth rate of PCL in bulk samples is depressed upon adding a noncrystallizable component due to a decrease in chain mobility and diffusion of the chain segments, while the morphology of PCL crystals becomes more disordered. ,, In ultrathin films, the perturbation is expected to be even more important than in bulk samples due to space confinement. − …”

Section: Introductionmentioning

confidence: 72%

Morphologies of Various Polycaprolactone/Polymer Blends in Ultrathin Films

2015

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Morphologies of ultrathin films of nine poly(ε-caprolactone)/polymer miscible and immiscible binary blends have been investigated under isothermal crystallization conditions by real time atomic force microscopy, optical microscopy, and electron diffraction techniques. It was found that the truncated lozenge-shape morphology of the pure poly(ε-caprolactone) (PCL) crystals is modified in miscible blends, forming regular or inverted S- or C-shaped crystals, the curvature depending on the nature of the second polymer and increasing with blend composition. Moreover, the growth rate decreases with the addition of the second polymer following the same order as the crystal curvature: PVC > CPE(48%) > SAN(25%) > PC > SAN(9.5%) > PVME. In contrast, for immiscible blends, no significant changes in kinetics and morphology were observed since a constant crystal growth rate and the same truncated lozenge-shape morphology as pure PCL crystals are obtained at all compositions. Kinetic and morphological changes in miscible blends are discussed in terms of PCL/polymer intermolecular interactions since the growth rate decreases and the curvature increases with the addition of polymers of increasing interactions.

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Section: Introductionmentioning

confidence: 72%

Morphologies of Various Polycaprolactone/Polymer Blends in Ultrathin Films

2015

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“…PCL530 with a low T m of 5.5 °C was essentially amorphous in the studied T c range. Similar to other amorphous polymers blended with high-molecular-weight PCL that has substantial χ c and T m higher than 50 °C, PCL530 significantly impeded the crystallization of PCL80k because the dilution of crystallizable polymer chains can influence the free energy of nuclear formation and the transport process of the crystallizable component to the growing front of crystals. ,, …”

Section: Resultsmentioning

confidence: 99%

“…Similar to other amorphous polymers blended with highmolecular-weight PCL that has substantial χ c and T m higher than 50 °C, PCL530 significantly impeded the crystallization of PCL80k because the dilution of crystallizable polymer chains can influence the free energy of nuclear formation and the transport process of the crystallizable component to the growing front of crystals. 20,42,43 Surface Morphology. The spin-coated films and hotcompressed disks of PCL80k and PCL80k/2k (ϕ 80k = 75%) were used to examine the effects of processing method and T c on surface morphology and roughness.…”

Section: ■ Results and Discussionmentioning

confidence: 99%

Poly(ε-caprolactone)-Banded Spherulites and Interaction with MC3T3-E1 Cells

Wang

Cai

Jesse³

et al. 2012

Langmuir

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We report that protein adsorption, cell attachment, and cell proliferation were enhanced on spherulites-roughened polymer surfaces. Banded spherulites with concentric alternating succession of ridges and valleys were observed on spin-coated thin films of poly(ε-caprolactone) (PCL) and two series of PCL binary homoblends composed of high- and low-molecular-weight components when they were isothermally crystallized at 25-52 °C. Their thermal properties, crystallization kinetics, and surface morphology were examined. The melting temperature (T(m)), crystallinity (χ(c)), crystallization rate, and spherulitic patterns showed strong dependence on the crystallization temperature (T(c)) and the blend composition. The surface roughness of the spherulites was higher when T(c) was higher; thus, the larger surface area formed in banded spherulites could adsorb more serum proteins from cell culture media. In vitro mouse preosteoblastic MC3T3-E1 cell attachment, proliferation, and nuclear localization were assessed on the hot-compressed flat disks and spherulites-roughened films of the high-molecular-weight PCL and one of its homoblends. The number of attached MC3T3-E1 cells and the proliferation rate were greater on the rougher surfaces than those on the flat ones. It is interesting to note that cell nuclei were preferentially, though not absolutely, located in or close to the valleys of the banded spherulites. The percentage of cell nuclei in the valleys was higher than 78% when the ridge height and adjacent ridge distance were ~350 and ~35 nm, respectively. This preference was weaker when the ridge height was lower or at a higher cell density. These results suggest that isothermal crystallization of semicrystalline polymers can be an effective thermal treatment method to achieve controllable surface roughness and pattern for regulating cell behaviors in tissue-engineering applications.

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“…A detailed survey of the literature revealed that the spherulitic morphology of semicrystalline PCL and its miscible blends with other noncrystallizable polymers has been studied in great detail 61–64. However, there are very few such studies to date for PCL containing block copolymers 65, 66.…”

Section: Resultsmentioning

confidence: 99%

Effect of dispersion state of organoclay on cellular foam structure and mechanical properties of ethylene vinyl acetate copolymer/ethylene‐1‐butenecopolymer/organoclay nanocomposite foams

Park¹,

Chowdhury²,

Park³

et al. 2007

J of Applied Polymer Sci

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In this study, our goal is to obtain lower density of ethylene-vinyl acetate copolymer (EVA)/ethylene-1-butene copolymer (EtBC) foams without sacrificing mechanical properties. For this purpose EVA/EtBC/organoclay (Cloisite 15A, Closite 30B) nanocomposite foams were prepared. To investigate the effect of compatibilizer on the dispersion state of organoclay in cellular foam structure and mechanical properties of the EVA/EtBC/ organoclay foams composites were prepared with and without maleic anhydride grafted EtBC (EtBC-g-MAH). The dispersion of organoclay in EVA/EtBC/organocaly foams was investigated by X-ray diffraction and transmission electron microscopy. The EVA/EtBC nanocomposite foams with the compatibilzer, especially EVA/EtBC/Cloisite 15A/EtBC-g-MAH foams displayed more uniform dispersion of organoclay than EVA/EtBC nanocomposite foams without the compatibilzer. As a result, EVA/EtBC/ Cloisite 15A/EtBC-g-MAH foams have the smallest average cell size and highest 100% tensile modulus followed by EVA/EtBC/Cloisite 30B/EtBC-g-MAH foams.

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Crystallization behavior of poly(ϵ‐caprolactone) in poly(ϵ‐caprolactone) and poly(vinyl methyl ether) mixtures

Cited by 7 publications

References 43 publications

Morphologies of Various Polycaprolactone/Polymer Blends in Ultrathin Films

Morphologies of Various Polycaprolactone/Polymer Blends in Ultrathin Films

Poly(ε-caprolactone)-Banded Spherulites and Interaction with MC3T3-E1 Cells

Effect of dispersion state of organoclay on cellular foam structure and mechanical properties of ethylene vinyl acetate copolymer/ethylene‐1‐butenecopolymer/organoclay nanocomposite foams

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