Role of back-biting for generation of hybrid dimers and trimers on flash pyrolysis of poly(styrene-co-methacrylonitrile)

Yang, Minghao; Tsukame, Takahiro; Shibasaki, Yoshio

doi:10.1002/(sici)1099-0518(19990801)37:15<2747::aid-pola8>3.0.co;2-g

Cited by 6 publications

(1 citation statement)

References 11 publications

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“…According to the previous works on the thermal degradation of vinyl polymers,15–22 thermal degradation of the acrylic comb polymers seems to consist of following elementary reactions: (1) random scission of main chain by thermal agitation, (2) depolymerization (unzippering reaction), (3) back‐biting reaction, (4)β‐scission of main chain, (5) cutoff of side chain, (6) crosslinking, (7) carbonization (char formation). Furthermore, results of TG/FTIR measurements may be affected by the sample mass and the state of sample polymers (powder, solid‐mass, gel, liquid, etc.…”

Section: Discussionmentioning

confidence: 99%

Study on thermal degradation mechanisms of comb polyacrylates containing long fluorocarbon side chains by TG/FTIR

Shi

Saitoh

Shibasaki

2000

J. Polym. Sci. A Polym. Chem.

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Section: Discussionmentioning

confidence: 99%

Study on thermal degradation mechanisms of comb polyacrylates containing long fluorocarbon side chains by TG/FTIR

Shi

Saitoh

Shibasaki

2000

J. Polym. Sci. A Polym. Chem.

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Characterization of poly(styrene-co-methacrylonitrile)s obtained by low-temperature radiation polymerization and thermal degradation behavior measured by Py-GC and CRTG

Yang

Tsukame

Saitoh

et al. 2000

J. Polym. Sci. A Polym. Chem.

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Poly(styrene‐co‐methacrylonitrile)s were polymerized in solutions with different polarities (n‐hexane and THF) by low‐temperature γ‐ray irradiation polymerization in a temperature range of −83.6–30 °C. It was found by IR measurement that the composition of the copolymers changed remarkably due to the effects of the polarity of solvents and the polymerization temperature. The thermal degradation behavior in the flash pyrolysis and in the continuous heating pyrolysis of these copolymers was measured by Py‐GC and controlled rate thermogravimetry (CRTG). The effects of the copolymer composition and sequence distribution on the thermal degradation behavior were investigated. © 2000 John Wiley & Sons, Inc. J Polym Sci A: Polym Chem 38: 3569–3577, 2000

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Effect of functional groups on the thermal degradation of copolymers

Shibasaki

Yang

Sun

2002

Polymers for Advanced Techs

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Thermal degradation mechanisms of the copolymers of styrene (St) with methacrylonitrile (MAN) and amethylstyrene (aMSt) were studied by pyrolysis gas chromatography (Py-GC) and thermogravimetry (TG). Thermal degradation of vinyl polymers in flash pyrolysis proceeded mainly in the competition between depolymerization and back biting reaction caused by abstraction of H atom at a-position in pen-penultimate unit. Monomer molecules were regenerated by depolymerization, and dimer, trimer and ologomers were produced by back biting reaction. Methyl groups at a-position of monomer unit strictly hindered the back biting reaction. The role of functional groups on the thermal degradation was elucidated on the basis of bond dissociation energies of main chain (Q CÐC ), apparent activation energies (DE a ) obtained by Ozawa's method from the TG curves at various heating rates. Effect of chemical reactivity of ÐCN group in MAN unit on the thermal degradation was clarified by the controlled rate thermogravimetry (CRTG). Thermal Degradation of Copolymers / 265FIGURE 8. CRTG curves for PSt, PMAN and poly(St-co-MAN)s (F MAN = 33, 55, 78 mol%): constant rate of loss of mass, 20±30 mg min À1 .FIGURE 9. TG curves of PSt, PaMSt and poly(St-co-aMSt)s (F aMSt = 37, 52, 62 mol%): heating rate, 10°C min À1 .FIGURE 10. CRTG curves of PSt, PaMSt and poly(St-co-aMSt)s (F aMSt = 37, 52, 62 mol%): constant rate of loss of mass, 20±30 mg min À1 .

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Role of back-biting for generation of hybrid dimers and trimers on flash pyrolysis of poly(styrene-co-methacrylonitrile)

Cited by 6 publications

References 11 publications

Study on thermal degradation mechanisms of comb polyacrylates containing long fluorocarbon side chains by TG/FTIR

Study on thermal degradation mechanisms of comb polyacrylates containing long fluorocarbon side chains by TG/FTIR

Characterization of poly(styrene-co-methacrylonitrile)s obtained by low-temperature radiation polymerization and thermal degradation behavior measured by Py-GC and CRTG

Effect of functional groups on the thermal degradation of copolymers

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Role of back-biting for generation of hybrid dimers and trimers on flash pyrolysis of poly(styrene-co-methacrylonitrile)

Cited by 6 publications

References 11 publications

Study on thermal degradation mechanisms of comb polyacrylates containing long fluorocarbon side chains by TG/FTIR

Study on thermal degradation mechanisms of comb polyacrylates containing long fluorocarbon side chains by TG/FTIR

Characterization of poly(styrene-co-methacrylonitrile)s obtained by low-temperature radiation polymerization and thermal degradation behavior measured by Py-GC and CRTG

Effect of functional groups on the ­thermal degradation of copolymers

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Effect of functional groups on the thermal degradation of copolymers