ABOUT INDEXING EDITORIAL BOARD ARCHIVES AUTHOR GUIDELINES SUBMIT MANUSCRIPT AUTHORS'S SUBSCRIPTIONS AUTHORS'S PAGE
Materiale Plastice
https://doi.org/10.37358/Mat.Plast.1964

Impact factor: 1.393

OSIM Nr. R102356
ISSN 0025-5289
ISSN 2668-8220 (online)
Journal Metrics
(academic-accelerator.com)

* IF 2018-19: 1.393
* 5-Year IF: 1.17
* CiteScore: 1.29
* SNIP: 0.798
* SJR: 0.409
Crossref Member Badge
 DOI  logo

Materiale Plastice - Latest Issue
Latest Issue >>>

ARCHIVES
   Volume 57, 2020
   Volume 56, 2019
   Volume 55, 2018
   Volume 54, 2017
   Volume 53, 2016
   Volume 52, 2015
   Volume 51, 2014
   Volume 50, 2013
   Volume 49, 2012
   Volume 48, 2011
   Volume 47, 2010
   Volume 46, 2009
   Volume 45, 2008
   Volume 44, 2007
   Volume 43, 2006
   Volume 42, 2005
   Volume 41, 2004
   Volume 40, 2003
 
<<<< back

Materiale Plastice, Volume 48, Issue 1, pp. (2011)




LAURA MADALINA Popescu, ROXANA MIOARA Piticescu, TINCA Buruiana The Influence of Pressure on Acid Polyurethane Structure


Abstract:
Acid polyurethane of hard type was prepared to be further treated in hydrothermal conditions at high pressures of 20, 40, 60 and 80 atm. The influence of pressure on chemical structure and morphology of macromolecular chains have been investigated using Fourier transform Infrared Spectroscopy (FT-IR) and Differential Scanning Calorimetry (DSC). Three endothermic peaks appear in hydrothermally treated polyurethanes, being related to conformational changes due to polymer shrinking, decomposition and melting. Their corresponding enthalpies increase with pressure, probably due to a more compact polymer structure at high pressure. Under the influence of pressure, macromolecular chains modify their conformation and approach each other, leading to an increased density of the hydrogen bonds. Stretching vibrations of the -C=O group are shifted from 1746 to 1724 cm-1. There is an optimum pressure (60-80 atm) range where the polyurethane presents an increased capacity of interaction through carbonyl groups (r1 =1.295 at 60 atm) which is favorable for further composite synthesis. Keywords: acid polyurethane, high pressure, hydrothermal process, IR spectroscopy, DSC



Issue: 2011 Volume 48, Number 1
Pages:
download pdf   Download Pdf Article

View number: 0    |     Downloads number: 0  
<<<< back
 
  Search Authors
polymer