1997
DOI: 10.1021/ma970294h
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Chain Flexibility and 31P NMR Spin−Lattice Relaxation Measurements on Melts of Halogenated Poly(thionylphosphazenes)

Abstract: The chain flexibility of halogenated poly(thionylphosphazenes) (PTPs) [(NSOX) (NPCl2)2] n (X = F, Cl) was investigated by measuring the 31 P spin−lattice relaxation times of PTP melts. T 1 times were obtained at two different magnetic fields and at various temperatures above the glass transition of the polymers. The minimal T 1 time occurred at lower temperatures for the fluorinated polymer than for the chlorinated polymer. This result is in agreement with trends in glass transition temperatures of these poly… Show more

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Cited by 3 publications
(3 citation statements)
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“…To our knowledge, no previous ab initio investigation has been performed on these systems, though a study of the six member cycles with the CNPNPN and SNPNPN patterns has been performed by Jaeger and co-workers . The same group evaluated the structure, conformation and flexibility of polythionylphosphazene. , The present study aims to rationalize the impact of copolymerization on β. Such rationalization is particularly welcome as, in this case, the nature of the two “parent” polymers are very different (organic/inorganic, with second/third raw atoms, presenting a delocalized electron cloud/island-π bonding, ...).…”
Section: Introductionmentioning
confidence: 99%
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“…To our knowledge, no previous ab initio investigation has been performed on these systems, though a study of the six member cycles with the CNPNPN and SNPNPN patterns has been performed by Jaeger and co-workers . The same group evaluated the structure, conformation and flexibility of polythionylphosphazene. , The present study aims to rationalize the impact of copolymerization on β. Such rationalization is particularly welcome as, in this case, the nature of the two “parent” polymers are very different (organic/inorganic, with second/third raw atoms, presenting a delocalized electron cloud/island-π bonding, ...).…”
Section: Introductionmentioning
confidence: 99%
“…24 The same group evaluated the structure, conformation and flexibility of polythionylphosphazene. 27,28 The present study aims to rationalize the impact of copolymerization on β. Such rationalization is particularly welcome as, in this case, the nature of the two "parent" polymers are very different (organic/inorganic, with second/third raw atoms, presenting a delocalized electron cloud/island-π bonding, ...).…”
Section: Introductionmentioning
confidence: 99%
“…The relaxation rate is related to ␥ H 2 ␥ P 2 R Ϫ6 , where ␥ denotes the gyromagnetic ratios of the unlike nuclei and R the internuclear distance. 9 In inorganic materials, it is believed that the interaction between the protons and phosphorus contribute less to the relaxation pathways because of the absence of protons. However, the hydrogen bond in an HA unit cell is in the form of OH⅐⅐⅐OϭPO 3 linkages.…”
Section: Resultsmentioning
confidence: 99%