Study of the effect of conditions of synthesis on the phase-aggregate state of fluoroalkoxyphosphazene polymers

Sharov, V. N.; Иванова, Г. А.; Korol'ko, V. V.; Mileshkevich, V. P.; Klebanskii, A. L.; Saratovkina, T.I.; Sidorovich, Ye.A.; Surkova, N.S.; Kurlyand, S.K.; Pchelintsev, V.V.

doi:10.1016/0032-3950(81)90124-6

Cited by 3 publications

(5 citation statements)

References 9 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…If the groups are not sufficiently different in size or nature, the copolymers (8,29). Synthesis using lithium, in contrast to sodium, salts is claimed to produce rubber-like fluoroalkoxyphosphazene polymers (30). The presence of unreacted chlorine or low molecular weight oligomers can affect the bulk properties (31,32).…”

Section: Elastomers and Rubber Elasticitymentioning

confidence: 98%

Polyphosphazene Elastomers: Synthesis, Properties, and Applications

Singler¹,

Hagnauer²,

SICKA³

1982

ACS Symposium Series

View full text Add to dashboard Cite

The synthesis of a unique class of polymers with a phosphorus nitrogen backbone is described, with an emphasis on poly(dichlorophosphazene) and poly(organophosphazene) elastomers. Poly (dichlorophosphazene) can be prepared by high temperature melt or solution polymerization techniques, with or without the use of catalysts. High performance GPC and other dilute solution techniques have been used to monitor yield and to analyze molecular weight, molecular weight distribution, and chain structure. Although poly(dichlorophosphazene) is an elastomer, it must be modified in order to obtain long term hydrolytic stability and other useful properties. From a common poly(dichlorophosphazene) intermediate, one can introduce a variety of substituents giving polyorganophosphazenes with a wide range of physical properties. Some of the useful properties of phosphazene elastomers and their technological significance will be shown. This article concludes with a brief mention of alternate synthetic methods which may lead to useful polyphosphazene elastomers.The study of open-chain polyphosphazenes has attracted increasing attention in recent years, both from the standpoint of fundamental research and technological development. These polymers have been the subject of several recent reviews (1-6). Interest has stemmed from the continuing search for polymers with improved properties for existing applications as well as for new polymers with novel properties. The polyphosphazenes are highly flexible chains of alternating phosphorusnitrogen atoms with two substituents attached to the phosphorus atom. Although the properties of the polyphosphazenes are influenced to a degree by the molecular weight and chain structure, the properties are determined largely by the size and the nature of the substituent attached to the phosphorus-

show abstract

Section: Elastomers and Rubber Elasticitymentioning

confidence: 98%

Polyphosphazene Elastomers: Synthesis, Properties, and Applications

Singler¹,

Hagnauer²,

SICKA³

1982

ACS Symposium Series

View full text Add to dashboard Cite

show abstract

“…The polymeranalogous substitution of chlorine in PDCP by fluoroalkoxy groups has been studied in most detail (see early reviews 2,3 ). Sodium, 3, 42, 44, 46, 47, 66 ± 76 potassium, 75,77,78 and lithium 36, 74, 75, 77, 79 ± 81 alkoxides and also fluorinated alcohols (in the presence of triethylamine) have been used as nucleophilic agents. 3,48,82 Since some regularities of the formation of poly(fluoroalkoxyphosphazenes) have been considered in our previous review, 3 we do not discuss them here.…”

Section: Synthesis Of Poly(organophosphazenes) Based On Poly(dichloro...mentioning

confidence: 99%

“…For polymer B, the intrinsic viscosity substantially decreases (from 1.64 to 0.14 dl g 71 ) after a 20-h refluxing in aqueous acetone, while in the case of polymer A, it remains virtually the same. 79 This indicates that at a particular content of anomalous units, polyphosphazene undergoes hydrolytic destruction, which can occur, for example, as follows:…”

Section: Properties Of Poly(organophosphazenes) 1 Chemical Propertiesmentioning

confidence: 99%

“…Poly(fluoroalkoxyphosphazenes) do not burn in air; the oxygen index of their inflammability is 47 ± 65, and in some cases, it is as high as 80. 3,77,167,168 It has been found that the probability of decomposition of polyalkoxy-and polyaryloxyphosphazenes during photolysis 103,169 depends on the content of unsubstituted P ± Cl groups. In the absence of these groups, poly(organophosphazenes) possess high light resistance.…”

Section: Properties Of Poly(organophosphazenes) 1 Chemical Propertiesmentioning

confidence: 99%

“…3 For example, the glass transition temperature of {± N=P[OCH 2 (CF 2 ) 2 OCF 3 ] 2 ±} n determined by the thermomechanical method is 799 8C. 77 Tables 11 ± 14 contain data on the glass transition and melting temperatures of a series of poly(organophosphazenes) with different substituents. These data show that poly(alkoxy-and poly(fluoroalkoxy-phosphazenes) possess the lowest glass transition temperatures.…”

Section: Physical Propertiesmentioning

confidence: 99%

See 2 more Smart Citations