Paper Title:
The Properties of Dangling Chain-Networks Prepared by Cyclotrimerisation of Telechelic Diisocyanates
  Abstract

Here, as part of our experimental investigations dealing with poly(urethane-isocyanurate) networks, we investigate model irregular networks with increasing amount of dangling chains. In our study such an irregular network topology was obtained by partial substitution of a diol for a monohydroxy component during the preparation of isocyanate terminated precursors. Telechelic diisocyanates were synthesized from aromatic diisocyanate (2,4-TDI), α,ω-dihidroxypoly (oxypropylene) (PPG 2000), and diethyleneglycolmonomethylether (an aliphatic low-molecularweight monool component). The networks in undiluted state were prepared by cyclotrimerisation, in the presence of a catalyst. The network properties were estimated by multiple extraction in solvent, differential scanning calorimetry and photoelastical measurements. Independently of mechanical testing, the fraction and concentration of dangling and elastically active network chains were evaluated by the theory of branching processes (cascade theory). The influence of dangling chains on the mechanical properties was analyzed.

  Info
Periodical
Edited by
Dragan P. Uskokovic, Slobodan K. Milonjic and Dejan I. Rakovic
Pages
399-404
DOI
10.4028/www.scientific.net/MSF.518.399
Citation
J. Budinski-Simendić, M. Špírková, K. Dušek, T. Dikić, R. Radičević, S. Prendzov, I. Krakovsky, M. Ilavsky, "The Properties of Dangling Chain-Networks Prepared by Cyclotrimerisation of Telechelic Diisocyanates ", Materials Science Forum, Vol. 518, pp. 399-404, 2006
Online since
July 2006
Export
Price
$32.00
Share

In order to see related information, you need to Login.

In order to see related information, you need to Login.

Authors: Andrzej Sikorski
Abstract:Simple lattice model of polymer systems was developed and studied using the Monte Carlo method. The model chains were star-branched with f =...
169
Authors: Akira Shinozaki, Kikuo Kishimoto, Hirotsugu Inoue
Abstract:The mechanical properties of polymers are strongly influenced by meso-scale (10-9~10-3 m) structure such as entanglement, molecular weight...
983
Authors: Andrzej Sikorski
Abstract:Properties of macromolecules confined in a narrow slit, pore or capillary are important due to of their practical importance. Theoretical...
451
Authors: Ying Jun Jin, Tie Jun Wang
Abstract:The objective of the work is to numerically study the meso-scale deformation of amorphous glassy polymer. A molecular polymerization...
573
Authors: Rui Cheng, Wen Guang Wang, Teng Zhou Yang, Yu Jiang, Jia Ling Pu
Chapter 1: Supermolecular Chemistry and Crystal Engineering
Abstract:A new HBC derivative HBC-C17 containing 6 odd-carbon alkyl chains surrounding the hexabenzocoronene core was synthesized, and...
43