Microstructure evolution of poly[tetrafluoroethylene-co-(perfluoropropylvinylether)] films under uniaxial deformation

Chaoqing Yin, Daniel F. Miranda, Shihai Zhang, Qinghua Zhang, James Runt

Research output: Contribution to journalArticle

3 Citations (Scopus)

Abstract

This paper presents an investigation of semi-crystalline poly[tetrafluoroethylene -co-(perfluoropropylvinylether)] (PFA) films uniaxially drawn at two temperatures. The extent of crystal unit cell orientation increased significantly with drawing at both draw temperatures as expected, but crystallinity was found to increase with draw ratio only at the lower draw temperature, remaining unchanged at the higher temperature. Considering the evolution of small-angle X-ray scattering patterns as a function of deformation, a model for the changes in PFA lamellar microstructure on drawing was developed. The observed mechanical α and γ relaxations of PFA were assigned to relaxation of rigid and mobile amorphous segments, respectively. Drawing at 200 °C to a draw ratio of 7 leads to a ∼40 °C increase in the α transition temperature compared to the unoriented film, and the findings support the key role of molecular orientation in suppressing the cooperative motions of non-crystalline segments in drawn polymers.

Original languageEnglish (US)
Pages (from-to)480-487
Number of pages8
JournalPolymer
Volume99
DOIs
StatePublished - Sep 2 2016

Fingerprint

Microstructure
Temperature
Molecular orientation
X ray scattering
Crystal orientation
Superconducting transition temperature
Polymers
Crystalline materials
Crystals
tetrafluoroethylene

All Science Journal Classification (ASJC) codes

  • Organic Chemistry
  • Polymers and Plastics
  • Materials Chemistry

Cite this

Yin, Chaoqing ; Miranda, Daniel F. ; Zhang, Shihai ; Zhang, Qinghua ; Runt, James. / Microstructure evolution of poly[tetrafluoroethylene-co-(perfluoropropylvinylether)] films under uniaxial deformation. In: Polymer. 2016 ; Vol. 99. pp. 480-487.
@article{c0d619791436425c977041c7e88125ed,
title = "Microstructure evolution of poly[tetrafluoroethylene-co-(perfluoropropylvinylether)] films under uniaxial deformation",
abstract = "This paper presents an investigation of semi-crystalline poly[tetrafluoroethylene -co-(perfluoropropylvinylether)] (PFA) films uniaxially drawn at two temperatures. The extent of crystal unit cell orientation increased significantly with drawing at both draw temperatures as expected, but crystallinity was found to increase with draw ratio only at the lower draw temperature, remaining unchanged at the higher temperature. Considering the evolution of small-angle X-ray scattering patterns as a function of deformation, a model for the changes in PFA lamellar microstructure on drawing was developed. The observed mechanical α and γ relaxations of PFA were assigned to relaxation of rigid and mobile amorphous segments, respectively. Drawing at 200 °C to a draw ratio of 7 leads to a ∼40 °C increase in the α transition temperature compared to the unoriented film, and the findings support the key role of molecular orientation in suppressing the cooperative motions of non-crystalline segments in drawn polymers.",
author = "Chaoqing Yin and Miranda, {Daniel F.} and Shihai Zhang and Qinghua Zhang and James Runt",
year = "2016",
month = "9",
day = "2",
doi = "10.1016/j.polymer.2016.07.044",
language = "English (US)",
volume = "99",
pages = "480--487",
journal = "Polymer",
issn = "0032-3861",
publisher = "Elsevier BV",

}

Microstructure evolution of poly[tetrafluoroethylene-co-(perfluoropropylvinylether)] films under uniaxial deformation. / Yin, Chaoqing; Miranda, Daniel F.; Zhang, Shihai; Zhang, Qinghua; Runt, James.

In: Polymer, Vol. 99, 02.09.2016, p. 480-487.

Research output: Contribution to journalArticle

TY - JOUR

T1 - Microstructure evolution of poly[tetrafluoroethylene-co-(perfluoropropylvinylether)] films under uniaxial deformation

AU - Yin, Chaoqing

AU - Miranda, Daniel F.

AU - Zhang, Shihai

AU - Zhang, Qinghua

AU - Runt, James

PY - 2016/9/2

Y1 - 2016/9/2

N2 - This paper presents an investigation of semi-crystalline poly[tetrafluoroethylene -co-(perfluoropropylvinylether)] (PFA) films uniaxially drawn at two temperatures. The extent of crystal unit cell orientation increased significantly with drawing at both draw temperatures as expected, but crystallinity was found to increase with draw ratio only at the lower draw temperature, remaining unchanged at the higher temperature. Considering the evolution of small-angle X-ray scattering patterns as a function of deformation, a model for the changes in PFA lamellar microstructure on drawing was developed. The observed mechanical α and γ relaxations of PFA were assigned to relaxation of rigid and mobile amorphous segments, respectively. Drawing at 200 °C to a draw ratio of 7 leads to a ∼40 °C increase in the α transition temperature compared to the unoriented film, and the findings support the key role of molecular orientation in suppressing the cooperative motions of non-crystalline segments in drawn polymers.

AB - This paper presents an investigation of semi-crystalline poly[tetrafluoroethylene -co-(perfluoropropylvinylether)] (PFA) films uniaxially drawn at two temperatures. The extent of crystal unit cell orientation increased significantly with drawing at both draw temperatures as expected, but crystallinity was found to increase with draw ratio only at the lower draw temperature, remaining unchanged at the higher temperature. Considering the evolution of small-angle X-ray scattering patterns as a function of deformation, a model for the changes in PFA lamellar microstructure on drawing was developed. The observed mechanical α and γ relaxations of PFA were assigned to relaxation of rigid and mobile amorphous segments, respectively. Drawing at 200 °C to a draw ratio of 7 leads to a ∼40 °C increase in the α transition temperature compared to the unoriented film, and the findings support the key role of molecular orientation in suppressing the cooperative motions of non-crystalline segments in drawn polymers.

UR - http://www.scopus.com/inward/record.url?scp=84979701229&partnerID=8YFLogxK

UR - http://www.scopus.com/inward/citedby.url?scp=84979701229&partnerID=8YFLogxK

U2 - 10.1016/j.polymer.2016.07.044

DO - 10.1016/j.polymer.2016.07.044

M3 - Article

AN - SCOPUS:84979701229

VL - 99

SP - 480

EP - 487

JO - Polymer

JF - Polymer

SN - 0032-3861

ER -