Thermal oxidation and photo‐oxidation of poly(2,6‐dimethyl‐1,4‐phenylene oxide)

Kelleher, P. G.; Jassie, L. B.; Gesner, B. D.

doi:10.1002/app.1967.070110112

Cited by 58 publications

(12 citation statements)

References 4 publications

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“…carbonyl group), no such increase was observed for the other vacuum-annealed samples when compared with an unannealed standard. In agreement with these infrared spectroscopy results, Kelleher et al [22] found similar absorption bands for PXE heated to 125 ~ in air, while Madorsky [23] and Madorsky and Straus [24] observed that PXE annealed under vacuum was stable at 320 ~ Thus it appears that the decrease in bromine yield near the surface of PXE (see Fig. 5) can be attributed to the deactivation of the phenylene ring due to an oxidation reaction.…”

Section: Methodssupporting

confidence: 65%

Mutual diffusion studies of polystyrene and poly(xylenyl ether) using Rutherford backscattering spectrometry

Composto

Krämer

1991

J Mater Sci

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The concentration versus depth profile in diffusion couples initially consisting of layers of pure polystyrene (PS) and poly(xylenyl ether) (PXE) were measured. To reveal the profile, the PXE molecules (after diffusion) were preferentially stained in the glass by exposing the couple to a solution of 2 mol% Br in methanol; the covalently bound Br nuclei serve as heavy nuclear tags which permit a sensitive determination of the PXE depth profile by Rutherford backscattering spectrometry (RBS). The samples were annealed at temperatures, 7-, ranging from 1 77-21 0 ~ that are above the glass transition temperature, Tg, of the pure PS (105~ but below the Tg of pure PXE (21 6 ~ The measured concentration versus depth profile is markedly asymmetric, with a low slope at low values of the volume fraction of PXE, 4)PXE, but with a much greater slope at high values of qbpx E. These results are in qualitative agreement with the variation in the mutual diffusion coefficient, D, expected as qbpx E increases, causing the Tg of the blend to increase towards, and finally exceed, the diffusion temperature. Values of D extracted from these concentration versus depth profiles at low values of 4)PxE using the Boltzmann-Matano analysis are in good agreement with those measured by forward recoil spectrometry (FRES) in deuterated-PS: PXE couples with only small composition differences.

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Section: Methodssupporting

confidence: 65%

Mutual diffusion studies of polystyrene and poly(xylenyl ether) using Rutherford backscattering spectrometry

Composto

Krämer

1991

J Mater Sci

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“…This could be due to the oxidation process of aromatic methyl groups. 13 Analogous effect was not highlighted from the copolymer TGA trace.…”

Section: Synthesis and Thermal Properties Of Ppo-pc Block-copolymersmentioning

confidence: 88%

“…The composition and molecular characteristics of all synthesized material were performed by FTIR, 1 H NMR, 13 C NMR, MALDI-TOF, SEC, viscosimetric and calorimetric analyses. The spectroscopic and MALDI-TOF characterizations confirm the multi-block structure; 12 viscosimetric, calorimetric and SEC data are reported in Table I.…”

Section: Synthesis and Thermal Properties Of Ppo-pc Block-copolymersmentioning

confidence: 99%

“…The final product was then dissolved in chloroform, precipitated with an excess of isopropanol and immediately washed with ether. The composition and molecular characteristics of the synthesized product were performed by FTIR, 1 H NMR, 13 C NMR, SEC, viscosimetric, and calorimetric analyses (see Table I). …”

Section: Synthesis Of Ppo and Pc Diol-terminated And Of Pc-ppo Block-mentioning

confidence: 99%

“…from solvent or by compression molding. 1 H NMR and 13 C NMR spectra were conducted in deuterared chloroform with a 300 MHz Bruker AC300 spectrometer, using TMS as internal reference. The viscosity measurements were performed in chloroform at 32°C with a Schott Geräte mod AVS 310 semiautomatic viscometer.…”

Section: Introductionmentioning

confidence: 99%

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PPO–PC block‐copolymers used as compatibilizers in PS/PC blends

Sartore

Penco

Sciucca

et al. 2006

J of Applied Polymer Sci

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Block-copolymers containing poly(2,6-dimethyl-1,4-phenylene oxide) (PPO) and polycarbonate of bisphenol A (PC) segments were employed as compatibilizers in polystyrene (PS)/PC blends. Block-copolymers were prepared starting from oligomeric diols-terminated PPO and PC. The poly(phenylene ethers) was obtained by oxidative coupling of 2,6-dimethyl-phenol in presence of tetramethyl bisphenol A. The copolymers were obtained with a chain extension reaction between the starting oligomers using bischloroformate of bisphenol A or phosgene as coupling agent. PS/PC blends, cast from chloroform solutions or mixed by melt, were studied by differential scanning calorimeter (DSC), dynamic-mechanical thermal analysis (DMTA), and optical microscopy (OP). The thermal and morphological analyses showed a clear compatibilization effect between PS and PC, if PPO-PC copolymer is added when blending is performed in the melt; in addition, also mechanical properties are increased when compared with blends without PPO-PC.

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Some aspects of the photooxidation mechanism of poly(2,6‐dimethyl‐1,4‐phenylene oxide)

Wandelt¹,

Jachowicz²,

Κryszewski³

1981

Acta Polymerica

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The photooxidation of poly(2,6-dimethyl-l,4-phenylene oxide) was studied by using various analytical techniques such as UV, IR, MS spectroscopy as well as viscosity and oxygen uptake measurements. The photooxidation process was found to be diffusion controlled and the rate coefficients of oxygen uptake have similar values as other amorphous polymers. Spectroscopic techniques showed that UV irradiation in the presence of oxygen leads to statistical scission of the polymer and formation of aldehydes. Einige Aspekte des Photooxidationsmechanismus yon Poly(2,B-dimethyl-1 ,I-phenylemxid)Die Photooxidation von Poly(2,6-dimethyl-l,4-phenylenoxid) wurde mit verschiedencn Methoden wie UV-, IR-und Massenspektroskopie sowie durch die Bestimmung der Viskositat nnd Sauerstoffaufnahme untersucht. Es wurde gefunden, daB die Photooxidation durch die Sanerstoffdiffusion kontrolliert wird und daB die Geschwindigkeitskonstanten der Sauerstoffaufnahme ahnliche Werte haben, wie fur andere amorphe Polymere gefunden wurden. Die spektroskopischen Untersuchungen haben gezeigt, daW die UV-Bestrahlung in Anwesenheit von Sauerstoff zu einer statistischen Kettenspaltung und zur Erzeugung von Aldehyden fuhrt. Heicomopbie acneicmb6 wexanu3aa @omooKUc~enu~ noau-~,fi-dUAWnufi-1 ,d-@enuaeno~cuaaMCTOHaMH Y @ -, RH-R MaCC-CnCKTpoCKOnIIR, a TaHXC MCTOAaMR OnpCACJICHRR BFI3KOCTII R IIOPJIOqeHHR KMCJIOpOAa M3yYaJlOCb @OTOOKRCJICHGfC noJIR-2 ,6-ARMeTRJI-i ,4-@3HHJICHOKCRAa. YCTaHOBJICHO, 9 T O IlpOIICCC (IOTOOKHCJIeHRfl KOHTpOJIHPJVTCH AII@@y3Hefi KHCJIOpOAa II YTO KOHCTaHTbI CKOPOCTH IIOrJIOqCHlfFI KMCJIOpOAa 6JIM3KH K COOTBeT-CTBYIoqRM KOHCTaHTaM AJIFI Apyl'RX aMOp@HbIX IIOJIRMepOB. CIICKTpOCKOnRYCKRe RCCJIegOBaHIIR IIOKa3aJIR, YTO b'@-O6JIyYCHRe B IIpRCYTCTBHH IFRCJIOpOAa IIPMBOART K CTaTHCTHVCCKOMY PaCqCnJIeHHIo QCnCfi R 06pa30sa~nm aJIbACrRAOB.

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Thermal oxidation and photo‐oxidation of poly(2,6‐dimethyl‐1,4‐phenylene oxide)

Cited by 58 publications

References 4 publications

Mutual diffusion studies of polystyrene and poly(xylenyl ether) using Rutherford backscattering spectrometry

Mutual diffusion studies of polystyrene and poly(xylenyl ether) using Rutherford backscattering spectrometry

PPO–PC block‐copolymers used as compatibilizers in PS/PC blends

Some aspects of the photooxidation mechanism of poly(2,6‐dimethyl‐1,4‐phenylene oxide)

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