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Title: Effects of Environmental and Experimental Design Parameters on the Dielectric Properties of Poly(ethylene) Terephthalate.

Abstract

Abstract not provided.

Authors:
;
Publication Date:
Research Org.:
Sandia National Lab. (SNL-NM), Albuquerque, NM (United States)
Sponsoring Org.:
USDOE National Nuclear Security Administration (NNSA), Office of Defense Nuclear Security (NA-70)
OSTI Identifier:
1398852
Report Number(s):
SAND2016-9863C
647951
DOE Contract Number:
AC04-94AL85000
Resource Type:
Conference
Resource Relation:
Conference: Proposed for presentation at the Rio Grande Symposium on Advanced Materials held October 3, 2016 in Albuquerque, NM.
Country of Publication:
United States
Language:
English

Citation Formats

Belcher, Cami Beth, and Appelhans, Leah. Effects of Environmental and Experimental Design Parameters on the Dielectric Properties of Poly(ethylene) Terephthalate.. United States: N. p., 2016. Web.
Belcher, Cami Beth, & Appelhans, Leah. Effects of Environmental and Experimental Design Parameters on the Dielectric Properties of Poly(ethylene) Terephthalate.. United States.
Belcher, Cami Beth, and Appelhans, Leah. Sat . "Effects of Environmental and Experimental Design Parameters on the Dielectric Properties of Poly(ethylene) Terephthalate.". United States. doi:. https://www.osti.gov/servlets/purl/1398852.
@article{osti_1398852,
title = {Effects of Environmental and Experimental Design Parameters on the Dielectric Properties of Poly(ethylene) Terephthalate.},
author = {Belcher, Cami Beth and Appelhans, Leah},
abstractNote = {Abstract not provided.},
doi = {},
journal = {},
number = ,
volume = ,
place = {United States},
year = {Sat Oct 01 00:00:00 EDT 2016},
month = {Sat Oct 01 00:00:00 EDT 2016}
}

Conference:
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  • Abstract not provided.
  • Abstract not provided.
  • Differential scanning calorimetry, density and microhardness (H) of poly(ethylene terephthalate) (PET) samples crystallized isothermally at various temperatures from the melt under high pressure (4kbar) was determined to establish correlations with microstructure. Results reveal that these materials show density, enthalpy of fusion, and melting temperature values which are not far off from those corresponding to chain extended crystals. The high crystallinities obtained (0.7-0.95) for high pressure crystallized PET are shown to give rise to high microhardness values which are in the vicinity of some metals (300-400) MPa. Data are analyzed on the basis of a two-phase model which allows an estimationmore » of the influence of crystal thickness upon H. The temperature dependence of microhardness of high pressure crystallized PET is also reported.« less
  • Small-angle X-ray scattering (SAXS) studies and polarized optical microscopy were undertaken to explore possible morphological explanations for the poor mechanical strength in the petaloid bases of poly(ethylene terephthalate) bottles. With a standard commercial production line, one set of injection-molded preforms was overpacked by 1.1 wt % to investigate the effect on the molecular morphology with respect to a set of control samples. Both sets of preforms showed highly crystalline and oriented areas corresponding to the injection gate region. The main body of the control preform was amorphous, and although the overpacked preform was essentially amorphous, there was some evidence formore » weak crystallinity. The SAXS patterns of the bottle petaloid base blown from the corresponding preforms produced similar SAXS patterns for overpacked and control bottle bases, indicating that the commercial process is robust at least to this degree of overpacking. Optical microscopy showed detailed crystalline features around the gate region and thin crystalline layers sandwiched between a quenched skin layer in direct contact with the cold mold walls and the main flow of material into the mold.« less