On the influence of the chemical structure of polymers on their thermal stability

Matveyev, Yu.I.; Аскадский, А.А.; Zhuravleva, Irina; Slonimskii, G.L.; Korshak, V.V.

doi:10.1016/0032-3950(81)90244-6

Cited by 12 publications

(3 citation statements)

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“…When HFPO is used without PFOSF, initiation and termination by CF 3 groups is less likely, and films reveal the presence of OH and CO/COO moieties due to the reaction of unterminated CF 2 chain radicals with oxygen and moisture . Carboxyl end groups are observed in fluoropolymers produced using bulk processing methods and are generally considered deleterious and unstable. − CF 3 end groups can impart properties desirable for many applications, including thermal stability and hydrophobicity. , The presence of the PFOSF initiator radical thus provides a means for selectively endcapping the PTFE chains.…”

Section: Resultsmentioning

confidence: 99%

Perfluorooctane Sulfonyl Fluoride as an Initiator in Hot-Filament Chemical Vapor Deposition of Fluorocarbon Thin Films

2001

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We have demonstrated the successful use of an initiator species in hot-filament chemical vapor deposition (HFCVD) of poly(tetrafluoroethylene) thin films from the precursor hexafluoropropylene oxide (HFPO). The introduction of perfluorooctane sulfonyl fluoride (PFOSF) in small concentrations allows the enhancement of deposition rates and increased control over film composition. Endcapping by CF3 groups is possible, which may provide benefits such as enhanced thermal stability and higher hydrophobicity for HFCVD films. Conversion of the PFOSF is high, and HFPO utilization efficiency can be increased significantly. The generation of an initiator radical via the pyrolysis of PFOSF may contribute to enhanced nucleation rates during film growth. Initiation and/or nucleation is rate-limiting at low filament temperatures, and mass transport limitations dominate at higher filament temperatures.

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Section: Resultsmentioning

confidence: 99%

Perfluorooctane Sulfonyl Fluoride as an Initiator in Hot-Filament Chemical Vapor Deposition of Fluorocarbon Thin Films

2001

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“…Using the experimental value (0.5) of the (T g 7T g0 )/(T g1 7T g0 ) ratio and Eqn (38), we can find that a = 0.7. Hence, this system contains a mixture of linear and cross-linked fragments.…”

Section: The Values Ofmentioning

confidence: 92%

Peculiarities of the structure and properties of highly cross-linked polymer networks

Аскадский¹

1998

Russ. Chem. Rev.

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“…The polymers formed from relatively long and flexible monomer units generally have more amorphous polymer structures, which means that the thermal features of such polymers are worse when compared to the monomers with more rigid chemical groups. Accordingly, the presence of aromatic segments in the polymer backbone creates a positive effect on the thermal stability of the polymers, while the existence of double bonds or oxygen-including groups in the molecular chain of the polymer makes the material more vulnerable to the heat action [8].…”

Section: Introductionmentioning

confidence: 99%

Investigation of the decomposition behavior of the fluoroalkyl acrylate homopolymer and its grafted copolymers onto high-density polyethylene

Soykan,

Çetin

2024

Journal of New Results in Science

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In this study, the thermal degradation behavior of both poly(3,3,4,4,5,5,6,6,7,7,8,8,8-dodecafluoro-5-methyloctyl-4-(acryloyloxy) benzoate), poly(ABCF13) and its graft copolymers onto high-density polyethylene (HDPE) was investigated in detail. The homopolymers and grafted copolymers were synthesized using the bulk-melt polymerization method in the presence of benzoyl peroxide; 10% and 40% of ABCF13 were used in the graft copolymers. The combined analytical technique, Thermo Gravimetric Analysis coupled with Fourier Transform Infrared Spectroscopy (TGA/FTIR), was utilized to understand the obtained products' thermal behavior and formed decomposition chemicals. The thermal tests were carried out in both air and N2 atmospheres. The experimental results showed that the first weight loss of poly(ABCF13) in air and N2 atmospheres started at about 226°C (1.00%), and the primary and early decomposition product was determined as CO2. The weight loss pattern in graft copolymers at lower concentrations closely resembled that of the homopolymer. However, at higher concentrations, the resulting products exhibited a distinct decomposition mechanism characterized by a gradual decrease in trend. This segmented behavior may indicate the coexistence of the homopolymer and grafted copolymers within the matrix. Moreover, the findings showed that the semi-fluorinated grafted unit had a substantial retardation effect on the polymer.

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On the influence of the chemical structure of polymers on their thermal stability

Cited by 12 publications

References 1 publication

Perfluorooctane Sulfonyl Fluoride as an Initiator in Hot-Filament Chemical Vapor Deposition of Fluorocarbon Thin Films

Perfluorooctane Sulfonyl Fluoride as an Initiator in Hot-Filament Chemical Vapor Deposition of Fluorocarbon Thin Films

Peculiarities of the structure and properties of highly cross-linked polymer networks

Investigation of the decomposition behavior of the fluoroalkyl acrylate homopolymer and its grafted copolymers onto high-density polyethylene

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