Crystal structure of poly(p-phenylene sulfide) by nuclear magnetic resonance spectroscopy

Jurga, J.

doi:10.1016/0032-3861(93)90177-c

Cited by 12 publications

(7 citation statements)

References 8 publications

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“…Tabor et al,3 who performed X‐ray studies on oriented films, proposed an orthorhombic unit cell with a = 8.67, b = 5.61, and c = 10.26 A, and space group Pbcn. This structure received confirmation by successive studies by Lovinger et al4 and Uemura et al5 Jurga6 found that the structure of PPS depends on sample preparation conditions. In particular, a new structure was proposed for samples extracted with water and tetrahydrofuran.…”

Section: Introductionmentioning

confidence: 79%

Crystallization, morphology, and thermal behavior of poly(p-phenylene sulfide)

Silvestre¹,

Pace²,

Napolitano

et al. 2001

J. Polym. Sci. B Polym. Phys.

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This article deals with the structure, crystallization, morphology, and thermal behavior of poly(p‐phenylene sulfide) (PPS) with low‐molecular mass, probed by DSC, optical, and electron microscopy. The growth rates of spherulites were measured over the temperature range 235–275°C. A regime II–III transition was found at T = 250°C. The regime transition was accompanied by a morphological change from sheaflike structure to classical spherulites. The Avrami equation poorly described the isothermal crystallization of PPS, for the occurrence of mixed growth mechanisms and secondary crystallization, in agreement with the morphology and the thermal behavior. Two melting peaks were detected on DSC curves and attributed to the melting of crystals formed isothermally at Tc by primary and secondary crystallization. © 2001 John Wiley & Sons, Inc. J Polym Sci B: Polym Phys 39: 415–424, 2001

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Section: Introductionmentioning

confidence: 79%

Crystallization, morphology, and thermal behavior of poly(p-phenylene sulfide)

Silvestre¹,

Pace²,

Napolitano

et al. 2001

J. Polym. Sci. B Polym. Phys.

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“…This structure received confirmation by successive studies of Lovinger et al [104] and Uemura et al [105]. Jurga [106] found that the structure of PPS depends on sample preparation conditions. New insight into the PPS structure was given by Napolitano et al [107].…”

Section: Poly(p-phenylene Sulfide)mentioning

confidence: 80%

Conducting Polymers: Concepts and Applications

Mishra

2018

Jour. Atomic Mole. Conden. Nano Phys.

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The developments in the field of electrically conducting polymers have grown very rapidly since the discovery and there is a very sharp increase in conductivity when intrinsically insulating organic conjugated polymers are doped with oxidizing and reducing agents. An overview of technological developments involving conducting polymers clearly indicates that the field expands at unprecedented rates. The manuscript first introduces the conducting polymers (CPs), conducting mechanism, concepts of doping and briefly introduces main applications. Different types of CPs, their unique properties and synthesis is discussed. The present review will help the effective implementation of conducting polymers in different fields, which directly depends on the degree of understanding of their behaviour and properties.properties of the conjugated polymers can be varied to a very large extent by appropriate functionalization. Most extensively studied area of the application of undoped conjugated polymers is the fabrication of the polymeric light-emitting diodes, i.e. electronic devices which exploit the phenomenon of electroluminescence. Electroluminescence of conjugated polymers and more precisely poly(p-phenylene vinylene) was first reported by Burroughes et al. [11] in 1990. These undoped conjugated polymers can also be used in the fabrication of a large variety of other devices like organic field-effect transistors. Polymer LEDs show attractive characteristics, including efficient light generation, with great potential for commercialisation. Again the polymer interests in polymers is in their potential use for rapid, low-cost processing using film-forming polymer solutions. Like the conductive polymers, the semi-conductive polymers obtain their properties from their conduction-molecular orbitals and valence molecular orbitals, i.e., bonding π and antibonding π * orbitals, respectively.In electro-chemical light emitting cells, the semi-conductive polymer could be surrounded asymmetrically with a hole-injection electrode on one side, and a low work function, electron injecting metal contact like aluminum, magnesium, calcium etc. on the other side. The emission of light is then the result of radiative charge carrier recombination in the polymer as electrons from one side and holes from the other recombine.Conducting polymers are conjugated polymers, namely organic compounds that have an extended p-orbital system, through which electrons can move from one end of the polymer to the other. In conjugated polymers, the bonding leads to one unpaired electron (the π-electron) per carbon atom. Moreover, π-bonding, in which the carbon orbitals are in the sp 2 pz configuration and in which the orbitals of successive carbon atoms along the backbone overlap, leads to electron delocalization along the backbone of the polymer. This electronic delocalization provides the "highway" for charge mobility along the backbone of the polymer chain. Electronically conducting polymers are extensively conjugated molecules, and it is believed that they po...

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“…Polyphenylene sulfide (PPS) is one kind of high performance engineering polymer with a unique combination of excellent physical, thermal, and mechanical properties. Although the physical, thermal and mechanical properties of PPS are widely investigated, 1–27 very few of PPS can directly be used as plastic products 28–34 . In order to improve the physical, thermal, and mechanical properties, PPS composites reinforced by fiber 14,35–43 or filled by mineral filler 44–59 have been developed.…”

Section: Introductionmentioning

confidence: 99%

Thermal aging performance of glass fiber/polyphenylene sulfide composites in high temperature

Wang

Ding

et al. 2021

J of Applied Polymer Sci

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In order to use the glass fiber reinforced polyphenylene sulfide composites (GF/PPS) in high temperature environments, thermal aging performance of two kinds of commercial grade PPS composites, reinforced by 40% glass fiber, PPS‐G40 HM and 1140L4, in thermal aging temperature of 250°C was compared by tensile strength, oxidized layer, color, crystallization and melting behavior. The results showed that tensile strength of GF/PPS composites is significantly decreased with increasing of aging time below 200 h and the tensile strength of aged PPS‐G40 HM is higher than that of aged 1140L4. The thickness of dark color area is increased with increasing of aging time. The thickness of oxidized layer of 1140L4 is thinner than that of PPS‐G40 HM. However, the color of oxidized layer of PPS‐G40 HM is lighter than that of 1140L4. The recrystallization in thermal aging results in the formation of crystal with higher melting point and increased melting temperature of GF/PPS composites. It is found that addition of epoxy resin can increase the initial mechanical property and improve the thermal aging performance of GF/PPS composites. A novel modified GF/PPS composite with higher thermal aging properties was obtained.

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Crystal structure of poly(p-phenylene sulfide) by nuclear magnetic resonance spectroscopy

Cited by 12 publications

References 8 publications

Crystallization, morphology, and thermal behavior of poly(p-phenylene sulfide)

Crystallization, morphology, and thermal behavior of poly(p-phenylene sulfide)

Conducting Polymers: Concepts and Applications

Thermal aging performance of glass fiber/polyphenylene sulfide composites in high temperature

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