Poly-2,6-dimethyl- 1,4-phenylene ether

Chalk and co-workers (99, 100), using the same complex, reported the lithiation of poly(2,6-dimethyl-1,4-phenylene) ether and poly(2,6-diphenyl-1,4-phenylene) ether under various metalation conditions. They achieved a catalyst efficiency of only 17%, as determined by the lithium content in the polymers. 

The polymer redistribution reaction with functionalized dendrimers has been investigated by Van Aert et al. for the case of the transetherification of poly-(2,6-dimethyl-1,4-phenylene ether) (PPE) by means of phenols attached to dendrimers [143]. The number average molecular weight of the arms is controlled by the ratio of moles of PE units and the moles of added phenol. The phenols have been attached to poly(propylene imine) dendrimers by means of a tert-butyloxycarbonyl tyrosine(Scheme 19a). The redistribution rate is slow but can be increased by adding CuCl / 4-dimethylaminopyridine catalyst. Oxygen-free... 

Zoller, P. Hoehn, H. H., "Pressure-Volume-Temperature Properties of Blends of Poly(2,6-dimethyl-1,4-phenylene ether) with Polystyrene," J. Polym. Sci., Polym. Phys. Ed., 20, 1385 (1982). 

Poncet et al. (1999) monitored frequency-dependent dielectric measurements to examine the phase-separation process in poly(2,6-dimethyl-1,4-phenylene ether) (PPE) in a DGEBA-MCDEA resin. Dielectric measurements measured the build up in Tg both in the PPE-rich continuous phase and in the epoxy-rich occluded phases for 30-60-wt.% PPE mixtures. In the 30% PPE mixmre, the rate of reaction of the thermoset phase is equivalent to that of the neat system due to two opposing effects, namely a slower reaction rate due to dilution and a low level of conversion at vitrification due to the presence of high-Tg PPE. In the 60-wt.% mixture the dilution effect of the PPE has a large effect of decreasing the reaction rate. The continuous thermoplastic-rich phase vitrifies first, followed by the thermoset occluded phase. The final morphology (size of occluded particles and composition of continuous phase) is affected by kinetics, diffusion and viscosity during phase separation. 

Abbreviations for the polymeric units in Table 2.10 (C H )- - phenyl ring, a-MS - alpha-methyl styrene, AN, acrylonitrile, BMA - butylmethacrylate, CHMA - cyclohexylmethacrylate. Cl - caprolactone, C(VC) - unit of chlorinated PVC, DNS - 2,4-dini-trostyrene-co-styrene, DTC -2,2-dimethyltrimethylenecarbonate, HFPC - hexafluoro bisphenol-A polycarbonate, MA - maleic anhydride, MMA - methylmethacrylate, PAr - unit of polyarylate, Phenoxy - unit of polyhydroxy ether of bisphenol-A, PPE - unit of poly(2,6-dimethyl-1,4-phenylene ether), S - styrene, TMPAr - unit of tetramethyl bisphenol-A polyarylate, TMPC - unit of tetramethyl bisphenol-A polycarbonate, VAc - vinyl acetate, VC - vinyl chloride, VCVAc90 - VC-co-VAc copolymer with 90 wt% VC, VME - vinylmethylether. 

Thermodynamic miscibility between the components such as in the case of polystyrene (PS) and poly(2,6-dimethyl 1,4-phenylene ether) (PPE) blends. 

Much of the published literature has been involved with the study of polymer miscibility. If there was a single development in polymer blend technology to choose, which promoted the interest in polymer blends (and miscibility), it would probably have to be the commercialization of miscible blends of poly(2,6 dimethyl-1,4 phenylene ether) and polystyrene (PPE/PS). This commercial, miscible blend provided the polymer science community an example of the potential of combining dissimilar polymer mixtures into unique compositions offering a price/performance balance not achievable with the unblended constituents. 

The aim of this work is to study the semi-batch precipitation of the polymer poly (2,6-dimethyl-1,4-phenylene ether) from a solution in toluene, using high-pressure CO2 as an anti-solvent. The influence of the process conditions on the degree of crystallinity, and the particle size and size distribution has been determined. 

D. Lovera, H. Ruckdaschel, A. Goldel, N. Behrendt, T. Frese, J. K. Sandler, V. Altstadt, R. Giesa, and H.-W. Schmidt. Tailored polymer electrets based on poly (2,6-dimethyl-1,4-phenylene ether) and its blends with polystyrene. Eur. Polym. J., 43(4) 1195-1201, April 2007. 

PPE poly(2,6-dimethyl-1,4-phenylene ether) ancient abbreviation ... 

Jain, R. K., Simha, R., Zoller, R, Theoretical equation of state of polymer blends, The poly(2,6-dimethyl-1,4-phenylene ether)-polystyrene pair. Journal of Polymer Science Polymer Physics Edition, 20(8), pp. 1399-1408 (1982). 

See Hexadimethrine chloride Poly 2,6-dimethyl-1,4-phenylene ether Poly (2,6-dimethyl-p-phenylene oxide) Poly (2,6-dimethyl-1,4-phenylene) oxide resin. See Polyphenylene ether Polydimethylsiloxane CAS 9016-00-6 INSgOOa... 

The copolymer exhibits a higher thermal air stability of about 70 °C along with improved mechanical properties in comparison to a conventional poly(2,6-dimethyl-1,4-phenylene ether). However, PPE with an end-capped methyl end group shows a higher thermal stability. This indicates that the thermal degradation mainly occurs from the polymer end group in air atmosphere. Thus, the higher thermal stability of the copolymer can be attributed to the 2,5-dimethylphenol unit which is found at the end of the copolymer [38]. 

JAN Janeczek, H., Turska, E., Szekely, T., Lengyel, M., and Till, F., D.s.c. studies on the phase separation of solutions of poly (2,6-dimethyl-1,4-phenylene ether) in deeaUn,... 

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