Influence of asymmetric ratio of polystyrene-block-poly(methyl methacrylate) block copolymer on the crystallization rate of PLA

Chien Pang Wu, Cheng Chien Wang, Chuh-Yung Chen

Research output: Contribution to journalArticle

7 Citations (Scopus)

Abstract

To investigate the influence of the asymmetric ratio of polystyrene-block-poly(methyl methacrylate) (PS-b-PMMA) on the crystallization rate of polylactide (PLA), we synthesized PS-b-PMMA samples featuring distinct asymmetric ratios by using mercaptan/ε-caprolactam living polymerization and subsequently melt-blended the polymers with PLA. Optical micrographs showed that the PMMA block facilitated the dispersion of PS-b-PMMA in the PLA matrix because of the favorable miscibility between PLA and PMMA. The results of nonisothermal and isothermal experiments indicated that adding 0.5 wt% PS-b-PMMA increased the crystallization rate of PLA when the value of the asymmetric ratio was ≤4. However, when the asymmetric ratio of PS-b-PMMA approached 6, the long-chain PMMA block retarded the chain mobility of PLA and lowered the crystallization rate. The results of polarization optical microscopy revealed that incorporation of PS-b-PMMA enhanced the crystallization rate of PLA through heterogeneous nucleation. The PS block in the PLA matrix provided the nucleation sites, whereas the PMMA block interacted with the PLA polymer chain and facilitated crystal growth. Lastly, wide-angle X-ray diffraction patterns suggested that incorporating PS-b-PMMA in the PLA matrix did not change the crystalline structure of PLA when the block-length ratio between PS and PMMA was varied. The asymmetric ratio of PS-b-PMMA strongly influenced the crystallization, and we optimized the asymmetric ratio of PS-b-PMMA in order to accelerate PLA crystallization.

Original languageEnglish
Pages (from-to)160-169
Number of pages10
JournalEuropean Polymer Journal
Volume66
DOIs
Publication statusPublished - 2015 Jan 1

Fingerprint

Crystallization
block copolymers
Polymethyl methacrylates
polymethyl methacrylate
Block copolymers
Polystyrenes
polystyrene
crystallization
Polymethyl Methacrylate
Nucleation
matrices
nucleation
polystyrene-block-poly(methyl methacrylate)
poly(lactide)
Polymers
Living polymerization
Caprolactam
optical polarization
polymers
Crystal growth

All Science Journal Classification (ASJC) codes

  • Physics and Astronomy(all)
  • Organic Chemistry
  • Polymers and Plastics
  • Materials Chemistry

Cite this

@article{fac568569a3b4567a347ccb3fc0d6196,
title = "Influence of asymmetric ratio of polystyrene-block-poly(methyl methacrylate) block copolymer on the crystallization rate of PLA",
abstract = "To investigate the influence of the asymmetric ratio of polystyrene-block-poly(methyl methacrylate) (PS-b-PMMA) on the crystallization rate of polylactide (PLA), we synthesized PS-b-PMMA samples featuring distinct asymmetric ratios by using mercaptan/ε-caprolactam living polymerization and subsequently melt-blended the polymers with PLA. Optical micrographs showed that the PMMA block facilitated the dispersion of PS-b-PMMA in the PLA matrix because of the favorable miscibility between PLA and PMMA. The results of nonisothermal and isothermal experiments indicated that adding 0.5 wt{\%} PS-b-PMMA increased the crystallization rate of PLA when the value of the asymmetric ratio was ≤4. However, when the asymmetric ratio of PS-b-PMMA approached 6, the long-chain PMMA block retarded the chain mobility of PLA and lowered the crystallization rate. The results of polarization optical microscopy revealed that incorporation of PS-b-PMMA enhanced the crystallization rate of PLA through heterogeneous nucleation. The PS block in the PLA matrix provided the nucleation sites, whereas the PMMA block interacted with the PLA polymer chain and facilitated crystal growth. Lastly, wide-angle X-ray diffraction patterns suggested that incorporating PS-b-PMMA in the PLA matrix did not change the crystalline structure of PLA when the block-length ratio between PS and PMMA was varied. The asymmetric ratio of PS-b-PMMA strongly influenced the crystallization, and we optimized the asymmetric ratio of PS-b-PMMA in order to accelerate PLA crystallization.",
author = "Wu, {Chien Pang} and Wang, {Cheng Chien} and Chuh-Yung Chen",
year = "2015",
month = "1",
day = "1",
doi = "10.1016/j.eurpolymj.2015.02.018",
language = "English",
volume = "66",
pages = "160--169",
journal = "European Polymer Journal",
issn = "0014-3057",
publisher = "Elsevier Limited",

}

Influence of asymmetric ratio of polystyrene-block-poly(methyl methacrylate) block copolymer on the crystallization rate of PLA. / Wu, Chien Pang; Wang, Cheng Chien; Chen, Chuh-Yung.

In: European Polymer Journal, Vol. 66, 01.01.2015, p. 160-169.

Research output: Contribution to journalArticle

TY - JOUR

T1 - Influence of asymmetric ratio of polystyrene-block-poly(methyl methacrylate) block copolymer on the crystallization rate of PLA

AU - Wu, Chien Pang

AU - Wang, Cheng Chien

AU - Chen, Chuh-Yung

PY - 2015/1/1

Y1 - 2015/1/1

N2 - To investigate the influence of the asymmetric ratio of polystyrene-block-poly(methyl methacrylate) (PS-b-PMMA) on the crystallization rate of polylactide (PLA), we synthesized PS-b-PMMA samples featuring distinct asymmetric ratios by using mercaptan/ε-caprolactam living polymerization and subsequently melt-blended the polymers with PLA. Optical micrographs showed that the PMMA block facilitated the dispersion of PS-b-PMMA in the PLA matrix because of the favorable miscibility between PLA and PMMA. The results of nonisothermal and isothermal experiments indicated that adding 0.5 wt% PS-b-PMMA increased the crystallization rate of PLA when the value of the asymmetric ratio was ≤4. However, when the asymmetric ratio of PS-b-PMMA approached 6, the long-chain PMMA block retarded the chain mobility of PLA and lowered the crystallization rate. The results of polarization optical microscopy revealed that incorporation of PS-b-PMMA enhanced the crystallization rate of PLA through heterogeneous nucleation. The PS block in the PLA matrix provided the nucleation sites, whereas the PMMA block interacted with the PLA polymer chain and facilitated crystal growth. Lastly, wide-angle X-ray diffraction patterns suggested that incorporating PS-b-PMMA in the PLA matrix did not change the crystalline structure of PLA when the block-length ratio between PS and PMMA was varied. The asymmetric ratio of PS-b-PMMA strongly influenced the crystallization, and we optimized the asymmetric ratio of PS-b-PMMA in order to accelerate PLA crystallization.

AB - To investigate the influence of the asymmetric ratio of polystyrene-block-poly(methyl methacrylate) (PS-b-PMMA) on the crystallization rate of polylactide (PLA), we synthesized PS-b-PMMA samples featuring distinct asymmetric ratios by using mercaptan/ε-caprolactam living polymerization and subsequently melt-blended the polymers with PLA. Optical micrographs showed that the PMMA block facilitated the dispersion of PS-b-PMMA in the PLA matrix because of the favorable miscibility between PLA and PMMA. The results of nonisothermal and isothermal experiments indicated that adding 0.5 wt% PS-b-PMMA increased the crystallization rate of PLA when the value of the asymmetric ratio was ≤4. However, when the asymmetric ratio of PS-b-PMMA approached 6, the long-chain PMMA block retarded the chain mobility of PLA and lowered the crystallization rate. The results of polarization optical microscopy revealed that incorporation of PS-b-PMMA enhanced the crystallization rate of PLA through heterogeneous nucleation. The PS block in the PLA matrix provided the nucleation sites, whereas the PMMA block interacted with the PLA polymer chain and facilitated crystal growth. Lastly, wide-angle X-ray diffraction patterns suggested that incorporating PS-b-PMMA in the PLA matrix did not change the crystalline structure of PLA when the block-length ratio between PS and PMMA was varied. The asymmetric ratio of PS-b-PMMA strongly influenced the crystallization, and we optimized the asymmetric ratio of PS-b-PMMA in order to accelerate PLA crystallization.

UR - http://www.scopus.com/inward/record.url?scp=84923334345&partnerID=8YFLogxK

UR - http://www.scopus.com/inward/citedby.url?scp=84923334345&partnerID=8YFLogxK

U2 - 10.1016/j.eurpolymj.2015.02.018

DO - 10.1016/j.eurpolymj.2015.02.018

M3 - Article

VL - 66

SP - 160

EP - 169

JO - European Polymer Journal

JF - European Polymer Journal

SN - 0014-3057

ER -