In:
Die Makromolekulare Chemie, Wiley, Vol. 191, No. 8 ( 1990-08), p. 1853-1861
Abstract:
The copolymerization equation considering the penultimate unit effect, the so called penultimate model, takes a simplified shape in the case of r 2 = 0 (monomer 2, M 2 , does not homopolymerize). For this case a method analogous to the conventional KT(Kelen‐Tüdős)‐transformation for estimation of r 1 and r 1 ′ is proposed. The new method was verified by literature data for the system styrene/fumarodinitrile, polymerized with benzoyl peroxide at 70°C, yielding r 1 = 0,062 and r 1 ′ = 0,812. Classification of copolymerization curves by means of the classical copolymerization model permits to distinguish between three curve‐types: r 1 〈 2 (alternation with respect to M 2 ), r 1 = 2 (linear diagram with slope 0,5) and r 1 〉 2 (non alternating system). The penultimate model permits to generate further curve‐types of “S”‐shape with r 1 〉 2 and r 1 ′ 〉 2 or r 1 〉 2 and r 1 ′ 〈 2 ( r 1 = r 1 ′ for classically behaving systems and r 1 ≠ r 1 ′ for non‐classically behaving systems).
Type of Medium:
Online Resource
ISSN:
0025-116X
,
0025-116X
DOI:
10.1002/macp.02.v191:8
DOI:
10.1002/macp.1990.021910811
Language:
English
Publisher:
Wiley
Publication Date:
1990
detail.hit.zdb_id:
1475026-0
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