Conformational behaviour of poly(2,6-dimethyl-1,4-phenylene oxide) in solution—I

Berg, J.W.A. van den; Ridder, G. van de; Smolders, C.A.

doi:10.1016/0014-3057(81)90199-3

Cited by 12 publications

(11 citation statements)

References 18 publications

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“…The x-ray diagrams in Figures 4 to 10 A similar process of drying in the case of a sample a t 130°C requires a period of time of several weeks, and several months (Fig. Similar accounts for PPO were published elsewhere [12] in the instance of toluene and trichloroethylene, for which the conformational changes occur in a different temperature range (25 t o SOOC). The differing time of formation of the ordered structure of PPO indicates various degrees of convolutions of macromolecules in those cases.…”

Section: Results and Conclusionsupporting

confidence: 54%

X‐ray studies of crystallization of poly(2,6‐dimethyl‐1,4‐phenylene oxide) on swelling in certain systems

Hurek

Turska

1984

Acta Polymerica

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The processes of swelling and crystallization of poly(2,6-dinicthyl-l,4-phenylene oxide) (PPO) in polymer-swelling agent systems as well as the structures obtained were investigated by means of wide-angle x-ray scattering. As the swelling agents we used mainly decalin and also or-pinen and tetralin. The effect of the swelling parameters of PPO in decalin on the possibilities of obtaining various polymcr structures was studied. The role played by a low-molecular substance in the process of the formation of crystalline structure in PPO was examined. I t was found that the crystallization mechanism depends mainly on the chemical propertics of the polymer and the s~velling agent,. Rontgenographische Untersuchurig der Kristallisation von Poly(2,6-dimethyl-I,d-phenylen~len-oxid) wulzrend des Quellungsprozesses in bestimmten SystemenDie Quellungs-und Kristallisationsprozesse von Poly(2,6-dimethyl-1,4-phenyleiioxid) (PPO) in Polymcr-Quellungsmittel-Systemen sowic die erhaltenen Strulituren wurden mittels Rontgenweitwinkelstreuung untersucht. Als Quellungsmittel wurden vorwiegend Decalin sowie a-Piricn und Tetralin eingesetzt. Iler EinfluS der Quellungsbedingungen in Decalin auf die Moglichkeit, verschiedene Polymcrstrulcturen zu erhalten, wurde gepriift. Die Rolle niedermolekularer Substanz im ProzeS der Rildung kristalliner Strultturen in PPO wurde untersucht. Es wurde gefunden, daS der Verlauf der Kristallisation vorwiegcnd voii den chemischeri Eigenschaften des Polymers und des Qnellungsmittels ab hangt . Penmzenozpa@ultec~oe uccneaoeame ~pucmannuaayuu nonu(2,6-au.uem~n-l,4-~enuneno~cu~a) e npoyecce t l a 6 y x a~u~ e onpeaeJceltnux cucme.uax

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Section: Results and Conclusionsupporting

confidence: 54%

X‐ray studies of crystallization of poly(2,6‐dimethyl‐1,4‐phenylene oxide) on swelling in certain systems

Hurek

Turska

1984

Acta Polymerica

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“…7 (MI!=2250) [13]. ex from ~r2~ollii=7.7 x 10-t' CM2 derived from Ke=1.7XlO-3 (dl/g) [30][31][32]. GN andaf.…”

Section: Discussionmentioning

confidence: 99%

Viscoelastic Properties of Melts of 'RADEL R' Polysulfone Fractions

Roovers

Toporowski

Ethier

1990

High Performance Polymers

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The linear viscoelastic properties of a series of RADEL R polyethersulfone fractions have been studied. The molecular weight of the fractions ranged from 2.4 X 10 3 to 7.2 X 10 4 . The RADEL R polyethersulfone is a thermorheologically complex material. After correction to iso-free volume, it has been found that 1/0∝M 3.4, w in agreement with the relation expected for entangled flexible polymers. Below M w = 10 000, 1/0∝ M 2.0 w . From integration under the loss peak of high molecular weight fractions it is found that the plateau modulus G° N =3.6x 10 7 . It is calculated that at 282°C the molecular weight between entanglements is M e =1550. The high plateau modulus is related to the molecular parameters of RADEL R polyethersulfone. Both the Graessley-Edwards model and the Lin model are discussed for a number of polymers that contain phenylene groups in the main chain.

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“…The aim of the present study is to check our earlier estimation [1] of the change of the radius of gyration with temperature for poly(2,6-dimethyl-l,4-phenylene oxide) (PPO) dissolved, for example, in toluene. This change was calculated from the change of intrinsic viscosity with temperature, using the Flory Fox equation:…”

Section: Introductionmentioning

confidence: 98%

Conformational behaviour of poly(2,6-dimethyl-1,4-phenylene oxide) in solution—II. Sedimentation coefficients and permeabilities in the semi-dilute region as a function of temperature

Berg

Ridder

Smolders

1982

European Polymer Journal

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Sedimentation and flotation coefficients of poly(2,6-dimethyl-l,4-phenylene oxide) (PPO) solutions have been measured as a function of temperature between 60 and 25. The solvents were toluene and trichloroethene (TCE). Solvent permeabilities have been calculated from the sedimentation or flotation coefficients. PPO is less permeable to the solvents used than polystyrene of comparable molecular weight is to toluene and cyclohexane. Strong solvation of toluene and TCE by PPO molecules is proposed as an explanation for this finding. The measured permeabilities were used to check an earlier calculation of the change of radius of gyration with temperature from intrinsic viscosity data. A larger decrease in radius of gyration with increasing temperature has been calculated in this way than with the earlier assumption of essentially impermeable polymer coils, i.e. with the assumption of the value 2.5 × 1023 for the universal viscosity parameter ¢'o.

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Conformational behaviour of poly(2,6-dimethyl-1,4-phenylene oxide) in solution—I

Cited by 12 publications

References 18 publications

X‐ray studies of crystallization of poly(2,6‐dimethyl‐1,4‐phenylene oxide) on swelling in certain systems

X‐ray studies of crystallization of poly(2,6‐dimethyl‐1,4‐phenylene oxide) on swelling in certain systems

Viscoelastic Properties of Melts of 'RADEL R' Polysulfone Fractions

Conformational behaviour of poly(2,6-dimethyl-1,4-phenylene oxide) in solution—II. Sedimentation coefficients and permeabilities in the semi-dilute region as a function of temperature

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