Structure-property relationships in PMR-type polyimide resins: 4. Investigation of materials derived from diamino(diaryl)methanes

Preston, Peter N.; Jigajinni, Veerappa B.; Soutar, Ian; Woodfine, Barry; Stewart, Nevin J.; Hay, J. N.

doi:10.1016/0032-3861(94)90776-5

Cited by 4 publications

(4 citation statements)

References 11 publications

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“…Two of these routes are initiated by O 2 and the third one by the thermolysis of C−CF 3 bond. As in the earlier cases, the oxygen initiated routes result in a bicyclic compound (21) and an epoxide (24), and the effective free energy barriers are 82.1 and 117.1 kcal mol −1 , respectively (Figure S10 and Table S6). Along the thermolysis initiated reaction pathways (Figure 1d S12), however free energy barrier along this route was found to have about 45 kcal mol −1 higher compared to other routes.…”

Section: ■ Resultssupporting

confidence: 54%

“…7,15,16,23−33 Many of these studies were focused on the improvement of thermo-oxidative stability of the existing polymers by chemical modifications of different molecular fragments of the polymer. 7,24,[26][27][28]34 Among various possible chemical modifications, fluorination of the polymer backbone is identified as a good strategy to improve the thermo-oxidative stability of the polymer. 8,29,30,35−37 In addition to the improved thermo-oxidative stability fluorination of the polymer backbone can also increase the T g of the polymer.…”

Section: ■ Introductionmentioning

confidence: 99%

“…In order to understand the mechanism and factors affecting the degradation of such polymers, various experimental and theoretical studies were performed. ,,,− Many of these studies were focused on the improvement of thermo-oxidative stability of the existing polymers by chemical modifications of different molecular fragments of the polymer. ,,− , Among various possible chemical modifications, fluorination of the polymer backbone is identified as a good strategy to improve the thermo-oxidative stability of the polymer. ,,,− In addition to the improved thermo-oxidative stability fluorination of the polymer backbone can also increase the T g of the polymer . Improved properties of fluorinated polymers is attributed to the high bond strength, low polarizability of the C–F bond and small size of the fluorine atom …”

Section: Introductionmentioning

confidence: 99%

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Insights into the Mechanism and Kinetics of Thermo-Oxidative Degradation of HFPE High Performance Polymer

Kunnikuruvan¹,

Parandekar²,

Prakash³

et al. 2016

J. Phys. Chem. B

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The growing requisite for materials having high thermo-oxidative stability makes the design and development of high performance materials an active area of research. Fluorination of the polymer backbone is a widely applied strategy to improve various properties of the polymer, most importantly the thermo-oxidative stability. Many of these fluorinated polymers are known to have thermo-oxidative stability up to 700 K. However, for space and aerospace applications, it is important to improve its thermo-oxidative stability beyond 700 K. Molecular-level details of the thermo-oxidative degradation of such polymers can provide vital information to improve the polymer. In this spirit, we have applied quantum mechanical and microkinetic analysis to scrutinize the mechanism and kinetics of the thermo-oxidative degradation of a fluorinated polymer with phenylethenyl end-cap, HFPE. This study gives an insight into the thermo-oxidative degradation of HFPE and explains most of the experimental observations on the thermo-oxidative degradation of this polymer. Thermolysis of C-CF3 bond in the dianhydride component (6FDA) of HFPE is found to be the rate-determining step of the degradation. Reaction pathways that are responsible for the experimentally observed weight loss of the polymer is also scrutinized. On the basis of these results, we propose a modification of HFPE polymer to improve its thermo-oxidative stability.

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Section: ■ Resultssupporting

confidence: 54%

Section: ■ Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

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Insights into the Mechanism and Kinetics of Thermo-Oxidative Degradation of HFPE High Performance Polymer

Kunnikuruvan¹,

Parandekar²,

Prakash³

et al. 2016

J. Phys. Chem. B

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“…for reasons of solubility. Many efforts have been made to overcome these shortcomings 2,3) . Recently, a modified PMR procedure (MPMR) has been developed in our laboratory 4) .…”

Section: Introductionmentioning

confidence: 99%

Study on a novel polyimide precursor prepared by a modified polymerization of monomeric reactants (MPMR) procedure

Chu

Zhang

et al. 2000

Macromol. Chem. Phys.

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N-(2-biphenylenyl)-4-[2′-phenylethynyl]phthalimide—new monomer synthesis, cure and thermal properties of resulting high temperature polymer

Georgiades

Hamerton

Hay

et al. 2002

Polymer

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Structure-property relationships in PMR-type polyimide resins: 4. Investigation of materials derived from diamino(diaryl)methanes

Cited by 4 publications

References 11 publications

Insights into the Mechanism and Kinetics of Thermo-Oxidative Degradation of HFPE High Performance Polymer

Insights into the Mechanism and Kinetics of Thermo-Oxidative Degradation of HFPE High Performance Polymer

Study on a novel polyimide precursor prepared by a modified polymerization of monomeric reactants (MPMR) procedure

N-(2-biphenylenyl)-4-[2′-phenylethynyl]phthalimide—new monomer synthesis, cure and thermal properties of resulting high temperature polymer

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