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Transesterification of Poly(4,4′‐isopropylidene‐2,2′‐dimethyldiphenylene terephthalate) and Poly(ethylene adipate) Blend in Solution
Author(s) -
Krentsel Liya B.,
Markova Gali D.,
Kudryavtsev Yaroslav V.,
Filatova Marina P.,
Vasnev Valerii A.,
Litmanovich Arkady D.,
Platé Nikolay A.
Publication year - 2005
Publication title -
macromolecular chemistry and physics
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.57
H-Index - 112
eISSN - 1521-3935
pISSN - 1022-1352
DOI - 10.1002/macp.200500265
Subject(s) - adipate , transesterification , ethylene , polymer chemistry , materials science , chemistry , catalysis , chemical engineering , organic chemistry , engineering
Summary: Transesterification of poly(4,4′‐isopropylidene‐2,2′‐dimethyldiphenylene terephthalate) and poly(ethylene adipate) (PEA) has been carried out in concentrated o ‐dichlorobenzene solution at 210 °C with Bu 2 SnO as a catalyst. According to GPC data, during transesterification the reaction product acquires Flory MWD and only a slight degradation of chains proceeds in the system: on average each chain having undergone about one scission in 100 min. Chain structure of the reaction products was studied using 1 H NMR spectroscopy. The kinetic and statistical analysis of the process was performed using following assumptions: transesterification proceeds in a homogeneous medium as a reversible second‐order reaction between diads, and the product chain structure obeys the first‐order Markov statistics. Calculated dependences of the parameters characterizing an evolution of the chain structure during the reaction fit experimental data fairly well. In 100 min the reacting system reaches a state close to the equilibrium. The difference between distributions of diads of residues and units is considered.Change of the terephthalate‐centered r ‐triads content with time.