Thermal degradation of poly(2,6‐dimethyl‐1,4‐phenylene oxide). I. The mechanism of degradation

Jachowicz, J.; Κryszewski, M.; Kowalski, Piotr

doi:10.1002/app.1978.070221015

Cited by 30 publications

(4 citation statements)

References 6 publications

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“…Additionally, in the region of aromatic structures, the signal broadened, which was due to the formation of the polyaromatic char (1457 and 963–720 cm −1 ) from the chemical rearrangement of PPO. 45–47 The broad band with center at 1035 cm −1 as well as signals at 621, 577, 473, and 417 cm −1 for low crystallite form of AlPO 4 was also found (Figure 11). ZB mainly acted in the condensed phase via a barrier mechanism limiting heat and mass transfer.…”

Section: Resultsmentioning

confidence: 80%

Flame-retardant mechanism of zinc borate and magnesium hydroxide in aluminum hypophosphite–based combination for TPE-S composites

Cheng

Yao³

et al. 2019

Journal of Fire Sciences

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Aluminum hypophosphite combined with melamine cyanurate and poly(phenylene oxide) was applied to flame retard TPE-S system (blends of SEBS and polyolefin). TPE-S containing 16 wt% aluminum hypophosphite, 20 wt% melamine cyanurate, and 10 wt% poly(phenylene oxide) pass a V-0 rating in the UL-94 test and its limiting oxygen index value is 28.2%. Zinc borate and magnesium hydroxide were added to modify the AHP/MCA/PPO formulation. Thermogravimetric–Fourier transform infrared analysis tests showed that aluminum hypophosphite and melaminecyanurate acted in gaseous phase while aluminum hypophosphite and poly(phenylene oxide) helped to form char residue. TPE-S/AHP/MCA/PPO significantly decreased the heat release rate (reduction in peak heat release rate from 2001 to 494 kW m−2). Scanning electron microscopy/energy dispersive spectrometry results demonstrated that zinc borate and magnesium hydroxide promoted to retain more P and O elements in residue. Zinc borate and magnesium hydroxide in AHP/MCA/PPO formulation enhanced the char formation and reduced gas evolution of TPE-S, thus deteriorating the combination between gaseous phase and condensed phase.

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Section: Resultsmentioning

confidence: 80%

Flame-retardant mechanism of zinc borate and magnesium hydroxide in aluminum hypophosphite–based combination for TPE-S composites

Cheng

Yao³

et al. 2019

Journal of Fire Sciences

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“…On the other hand, PPE has an aryl ether backbone with much greater thermal stability. Studies on the thermal degradation of PPE have shown that the thermal degradation occurs in two steps [ 61 , 62 , 63 ]. The first step in the degradation occurs between 430 and 500 °C where the polymer undergoes thermal Fries-type rearrangements of the polymer chain [ 64 ].…”

Section: Resultsmentioning

confidence: 99%

Poly(phenylene ether) Based Amphiphilic Block Copolymers

Peters

2017

Polymers

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Polyphenylene ether (PPE) telechelic macromonomers are unique hydrophobic polyols which have been used to prepare amphiphilic block copolymers. Various polymer compositions have been synthesized with hydrophilic blocks. Their macromolecular nature affords a range of structures including random, alternating, and di-and triblock copolymers. New macromolecular architectures can offer tailored property profiles for optimum performance. Besides reducing moisture uptake and making the polymer surface more hydrophobic, the PPE hydrophobic segment has good compatibility with polystyrene (polystyrene-philic). In general, the PPE contributes to the toughness, strength, and thermal performance. Hydrophilic segments go beyond their affinity for water. Improvements in the interfacial adhesion between polymers and polar substrates via hydrogen bonding and good compatibility with polyesters (polyester-philic) have been exhibited. The heterogeneity of domains in these PPE based block copolymer offers important contributions to diverse applications.

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“…be relatively more important in the region of aliphatic C{H stretching (2800-3000 cm 01 ) owing The pyrolysis products were separated by HP-1 Hewlett-Packard chromatographic column of 12.5 to the relative concentration of these groups in 8E20 4813 / 8e20$$4813 01-20-98 23:36:32 polaa W: Poly Applied observed in the thermal degradation of pure PPE carried out under inert atmosphere or vacuum. [9][10][11][12] A simultaneous decrease of intensity ratio of the ether band at 1188 cm 01 to the CH 3 band (1379 cm 01 ) is seen in the spectrum of the combustion residue, indicating that phenol groups result from scission of ether bonds of PPE. Another difference between spectra 1(a) and 1(b) concerns the relative decrease in the latter of the typical absorption of PS at 698 cm 01 .…”

Section: Resultsmentioning

confidence: 99%

Combustion and fire retardance of poly(2,6‐dimethyl–1,4‐phenylene ether)–high‐impact polystyrene blends. II. Chemical aspects

Boscoletto¹,

Checchin²,

Milan³

et al. 1998

J. Appl. Polym. Sci.

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ABSTRACT:The chemical reactions occurring during the intumescent process taking place in the combustion of the poly(2,6-dimethyl-1,4-phenylene ether) -high-impact polystyrene blends (PPE-HIPS) are studied in detail through the chemical characterization of the burnt and original material by infrared, pyrolysis-gas chromatographymass spectrometry, and direct insertion probe spectrometry. Evidence is given of thermal rearrangement in the blend of the polyether PPE chains to polybenzylic structures occurring in the heating conditions of pyrolysis or combustion, as previously shown, to take place in thermal degradation of PPE. The rearranged chain segments are shown to give a larger contribution to the intumescent char, while volatile blowing products are mostly formed by polystyrene and polybutadiene components. From PPE-HIPS blends, the volatilization of the fire-retardant triphenyl phosphate (TPP), which when heated alone volatilizes at a temperature below that of PPE-HIPS degradation, is delayed probably by hydrogen bonding with PPE. This allows TPP to play the typical flame inhibition role of volatile phosphorus compounds. Moreover, it is found that TPP favors the PPE rearrangement and henceforth increases the char yield of the burning blend, which is a typical condensed phase fire-retardant action.

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Thermal degradation of poly(2,6‐dimethyl‐1,4‐phenylene oxide). I. The mechanism of degradation

Cited by 30 publications

References 6 publications

Flame-retardant mechanism of zinc borate and magnesium hydroxide in aluminum hypophosphite–based combination for TPE-S composites

Flame-retardant mechanism of zinc borate and magnesium hydroxide in aluminum hypophosphite–based combination for TPE-S composites

Poly(phenylene ether) Based Amphiphilic Block Copolymers

Combustion and fire retardance of poly(2,6‐dimethyl–1,4‐phenylene ether)–high‐impact polystyrene blends. II. Chemical aspects

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