The effect of supercooling of the melt on the semicrystalline morphology of PA 66

Research output: Contribution to journalArticle

17 Citations (Scopus)

Abstract

Fast scanning chip calorimetry (FSC) was used to prepare isothermally crystallized samples of polyamide 66 (PA 66) in a wide range of temperatures between 70 and 230 °C for subsequent analysis of the semicrystalline morphology by X-ray diffraction, polarized-light optical microscopy and atomic force microscopy. At high crystallization temperatures stable triclinic α-crystals of lamellar shape, organized within a spherulitic superstructure are formed. At low crystallization temperatures, in contrast, the less stable pseudohexagonal γ-crystal structure/mesophase develops. The mesophase of PA 66, which forms at temperatures close to the glass transition, is of grainy, non-lamellar habit, and not organized within spherulites. The formation of such qualitatively different semicrystalline morphologies of PA 66 is suggested to be caused by different densities of crystal nucleation, supported by observation of a bimodal temperature-dependence of the crystallization rate. The experimental findings reported in this work are important to allow tailoring of the microstructure of PA 66 by variation of the conditions of processing as well as contribute to the ongoing research about crystal nucleation in polymers.

Original languageEnglish (US)
Pages (from-to)313-318
Number of pages6
JournalThermochimica Acta
Volume655
DOIs
StatePublished - Sep 10 2017

Fingerprint

Supercooling
Nylons
supercooling
Polyamides
Crystallization
crystallization
Crystals
Optical microscopy
nucleation
crystals
Nucleation
spherulites
Temperature
temperature
habits
polarized light
Calorimetry
Light polarization
heat measurement
chips

All Science Journal Classification (ASJC) codes

  • Instrumentation
  • Condensed Matter Physics
  • Physical and Theoretical Chemistry

Cite this

@article{588fed4b009c4861b765f74c0d63fb80,
title = "The effect of supercooling of the melt on the semicrystalline morphology of PA 66",
abstract = "Fast scanning chip calorimetry (FSC) was used to prepare isothermally crystallized samples of polyamide 66 (PA 66) in a wide range of temperatures between 70 and 230 °C for subsequent analysis of the semicrystalline morphology by X-ray diffraction, polarized-light optical microscopy and atomic force microscopy. At high crystallization temperatures stable triclinic α-crystals of lamellar shape, organized within a spherulitic superstructure are formed. At low crystallization temperatures, in contrast, the less stable pseudohexagonal γ-crystal structure/mesophase develops. The mesophase of PA 66, which forms at temperatures close to the glass transition, is of grainy, non-lamellar habit, and not organized within spherulites. The formation of such qualitatively different semicrystalline morphologies of PA 66 is suggested to be caused by different densities of crystal nucleation, supported by observation of a bimodal temperature-dependence of the crystallization rate. The experimental findings reported in this work are important to allow tailoring of the microstructure of PA 66 by variation of the conditions of processing as well as contribute to the ongoing research about crystal nucleation in polymers.",
author = "Gohn, {Anne M.} and Rhoades, {Alicyn Marie} and Wonderling, {Nichole M.} and Tighe, {Timothy B.} and Ren{\'e} Androsch",
year = "2017",
month = "9",
day = "10",
doi = "10.1016/j.tca.2017.07.012",
language = "English (US)",
volume = "655",
pages = "313--318",
journal = "Thermochimica Acta",
issn = "0040-6031",
publisher = "Elsevier",

}

The effect of supercooling of the melt on the semicrystalline morphology of PA 66. / Gohn, Anne M.; Rhoades, Alicyn Marie; Wonderling, Nichole M.; Tighe, Timothy B.; Androsch, René.

In: Thermochimica Acta, Vol. 655, 10.09.2017, p. 313-318.

Research output: Contribution to journalArticle

TY - JOUR

T1 - The effect of supercooling of the melt on the semicrystalline morphology of PA 66

AU - Gohn, Anne M.

AU - Rhoades, Alicyn Marie

AU - Wonderling, Nichole M.

AU - Tighe, Timothy B.

AU - Androsch, René

PY - 2017/9/10

Y1 - 2017/9/10

N2 - Fast scanning chip calorimetry (FSC) was used to prepare isothermally crystallized samples of polyamide 66 (PA 66) in a wide range of temperatures between 70 and 230 °C for subsequent analysis of the semicrystalline morphology by X-ray diffraction, polarized-light optical microscopy and atomic force microscopy. At high crystallization temperatures stable triclinic α-crystals of lamellar shape, organized within a spherulitic superstructure are formed. At low crystallization temperatures, in contrast, the less stable pseudohexagonal γ-crystal structure/mesophase develops. The mesophase of PA 66, which forms at temperatures close to the glass transition, is of grainy, non-lamellar habit, and not organized within spherulites. The formation of such qualitatively different semicrystalline morphologies of PA 66 is suggested to be caused by different densities of crystal nucleation, supported by observation of a bimodal temperature-dependence of the crystallization rate. The experimental findings reported in this work are important to allow tailoring of the microstructure of PA 66 by variation of the conditions of processing as well as contribute to the ongoing research about crystal nucleation in polymers.

AB - Fast scanning chip calorimetry (FSC) was used to prepare isothermally crystallized samples of polyamide 66 (PA 66) in a wide range of temperatures between 70 and 230 °C for subsequent analysis of the semicrystalline morphology by X-ray diffraction, polarized-light optical microscopy and atomic force microscopy. At high crystallization temperatures stable triclinic α-crystals of lamellar shape, organized within a spherulitic superstructure are formed. At low crystallization temperatures, in contrast, the less stable pseudohexagonal γ-crystal structure/mesophase develops. The mesophase of PA 66, which forms at temperatures close to the glass transition, is of grainy, non-lamellar habit, and not organized within spherulites. The formation of such qualitatively different semicrystalline morphologies of PA 66 is suggested to be caused by different densities of crystal nucleation, supported by observation of a bimodal temperature-dependence of the crystallization rate. The experimental findings reported in this work are important to allow tailoring of the microstructure of PA 66 by variation of the conditions of processing as well as contribute to the ongoing research about crystal nucleation in polymers.

UR - http://www.scopus.com/inward/record.url?scp=85026770593&partnerID=8YFLogxK

UR - http://www.scopus.com/inward/citedby.url?scp=85026770593&partnerID=8YFLogxK

U2 - 10.1016/j.tca.2017.07.012

DO - 10.1016/j.tca.2017.07.012

M3 - Article

AN - SCOPUS:85026770593

VL - 655

SP - 313

EP - 318

JO - Thermochimica Acta

JF - Thermochimica Acta

SN - 0040-6031

ER -