Ringed spherulites in ternary polymer blends of poly(?-caprolactone), poly(styrene-co-acrylonitrile), and polymethacrylate

Su, Chean-Cheng; Lin, Jiann-Horng

doi:10.1007/s00396-004-1119-y

Cited by 25 publications

(23 citation statements)

References 25 publications

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“…The presence of extinction ring in the spherulite is a very common phenomenon of PCL in most of the miscible PCL blends with variety of noncrystallizable polymers. 61,67,68 The sizes of spherulite formed for neat PCL-2.5K both at 40 C and 45 C, are much bigger than the spherulite formed for Pep-PCL-Ib hybrid (Fig. 7).…”

Section: Spherulitic Crystallization Studymentioning

confidence: 90%

Peptide‐poly(ε‐caprolactone) biohybrids by grafting‐from ring‐opening polymerization: Synthesis, aggregation, and crystalline properties

Paira

Banerjee

Mandal

2012

J. Polym. Sci. A Polym. Chem.

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Well‐defined peptide‐poly(ε‐caprolactone) (Pep‐PCL) biohybrids were successfully synthesized by grafting‐from ring‐opening polymerization (ROP) of ε‐caprolactone (CL) using designed amine‐terminated sequence‐defined peptides as macroinitiators. MALDI‐TOF‐MS and 1H NMR analyses confirmed the successful attachment of peptide to the PCL chain. The gel permeation chromatography (GPC) measurement showed that the Pep‐PCL biohybrids with controllable molecular weights and low polydispersities (PDI <1.5) were obtained by this approach. The aggregation of Pep‐PCL hybrid molecules in THF solution resulted in the formation of micro/nanospheres as confirmed through FESEM, TEM, and DLS analyses. The circular dichroism study revealed that the secondary structure of peptide moiety was changed in the peptide‐PCL biohybrids. The crystallization and melting behavior of Pep‐PCL hybrids were somewhat changed compared with that of neat PCL of comparable molecular weight as revealed by DSC and XRD measurements. In Pep‐PCL biohybrids, extinction rings were observed in the PCL spherulites, in contrast with the normal spherulite morphology of the neat PCL. There was a substantial decrease (4–5 folds) in the spherulitic growth rate after the incorporation of peptide moiety at the end of PCL chain as measured by polarizing optical microscopy. Pseudomonas lipase catalyzed enzymatic degradation was studied for Pep‐PCL hybrids and neat PCL. © 2012 Wiley Periodicals, Inc. J Polym Sci Part A: Polym Chem, 2012

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Section: Spherulitic Crystallization Studymentioning

confidence: 90%

Peptide‐poly(ε‐caprolactone) biohybrids by grafting‐from ring‐opening polymerization: Synthesis, aggregation, and crystalline properties

Paira

Banerjee

Mandal

2012

J. Polym. Sci. A Polym. Chem.

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“…But at 45 °C, the sample shows clear ringed spherulites. The presence of extinction ring in the spherulite is a very common phenomenon of PCL in most of the miscible PCL blends with variety of noncrystallizable polymers 61, 67, 68. The sizes of spherulite formed for neat PCL‐2.5K both at 40 °C and 45 °C, are much bigger than the spherulite formed for Pep‐PCL‐Ib hybrid (Fig.…”

Section: Resultsmentioning

confidence: 91%

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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“…Studies of blends of PCL and SAN have provided the rare opportunity of investigating various types of phase behavior such as phase separation, phase dissolution and crystallization, and many research groups have examined this blend [23][24][25]. Both, PCL and SAN are miscible only when SAN contains 8$28 wt% of acrylonitrile, and near to the borders of this "miscibility window," LCST behavior is observed.…”

Section: Model Blend Of Poly(e-caprolactone) (Pcl) and Poly(styrene-cmentioning

confidence: 99%

Characterization of Phase Behavior in Polymer Blends by Light Scattering

Svoboda

2014

Characterization of Polymer Blends

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Ringed spherulites in ternary polymer blends of poly(?-caprolactone), poly(styrene-co-acrylonitrile), and polymethacrylate

Cited by 25 publications

References 25 publications

Peptide‐poly(ε‐caprolactone) biohybrids by grafting‐from ring‐opening polymerization: Synthesis, aggregation, and crystalline properties

Peptide‐poly(ε‐caprolactone) biohybrids by grafting‐from ring‐opening polymerization: Synthesis, aggregation, and crystalline properties

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

Characterization of Phase Behavior in Polymer Blends by Light Scattering

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