Polymers Containing Sulfur, Poly(Phenylene Sulfide)

Geibel, Jon F.; Leland, John Everard

doi:10.1002/0471238961.1615122507050902.a01

Cited by 2 publications

(1 citation statement)

References 87 publications

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“…Poly(phenylene sulfide) [PPS; poly(thio-1,4-phenylene)] is a high-performance semicrystalline thermoplastic with excellent thermal and chemical resistance properties. − PPS, in filled and neat forms, is currently utilized in a variety of market segments that include electrical, electronic, automotive, appliance, industrial, and chemical sectors. The semirigid backbone of PPS renders the crystallization kinetics to be slow enough such that an isotropic melt can be quenched to a wholly amorphous form.…”

Section: Introductionmentioning

confidence: 99%

Influence of Semicrystalline Morphology on the Physical Aging Characteristics of Poly(phenylene sulfide)

2003

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We report on the influence of semicrystalline morphology on the physical aging characteristics of poly(phenylene sulfide) or PPS. Specifically, the semicrystalline morphology of PPS was described in terms of a three-phase system comprising a crystalline phase, a mobile-amorphous phase, and a rigidamorphous phase. The physical aging kinetics were observed to depend on the relative amounts of the mobile-amorphous and rigid-amorphous phases, with accelerated aging rates measured in specimens with higher rigid-amorphous phase fraction. We suggest that the rigid-amorphous phase, which includes chain segments that are more tightly packed relative to the mobile-amorphous phase, is able to accelerate physical aging due to its relative proximity to a state of lower configurational entropy. It is also possible for localized cooperative relaxations within the rigid-amorphous phase to facilitate molecular rearrangements that accelerate the aging process. We also suggest that the configurational entropic state of the mobile-and the rigid-amorphous phases are perhaps more relevant to physical aging in semicrystalline polymers than the proximity of the aging temperature to the glass transition temperatures of the respective phases.

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Section: Introductionmentioning

confidence: 99%

Influence of Semicrystalline Morphology on the Physical Aging Characteristics of Poly(phenylene sulfide)

2003

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Heat-setting Effect on the Morphology and Phase Structures of PPS Nonwovens

Xu¹,

Liu²,

Jiang

et al. 2020

ACS Appl. Polym. Mater.

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Thermal shrinkage has for long been a critical issue in nonwoven industrial applications. A dimensionally stable nonwoven web with excellent mechanical property was achieved by heat treatment with tension [taut annealed (TA)] instead of annealing under free state [free annealed (FA)], while the original high porosity was not affected. To better understand the fundamental structure−property relationship, these two different heat treatments' effects on the thermal behaviors, morphology, and phase structures of poly(phenylene sulfide) (PPS) nonwovens were elucidated via a combination of different experimental techniques such as temperature-modulated differential scanning calorimetry (DSC), two-dimensional wide-angle X-ray diffraction, two-dimensional small-angle X-ray scattering, and polarized Raman spectroscopy. It is evidenced that no obvious online stressinduced crystallization occurs during the melt-blowing process, making virgin PPS fibers mostly in the amorphous state. However, experimental results confirm that a certain amount of mesophase or constrained amorphous exists in the virgin PPS fibers without any presence of crystallites. After annealing, the DSC melting curves of both TA and FA PPS nonwovens exhibit endothermic annealing peaks, the origin of which is interpreted as the relaxation and devitrification of the rigid amorphous phase. However, the annealing peak position of the FA sample is always higher than that of the TA sample, which is reported for the first time. As compared with the FA sample annealed at the same temperature, TA PPS nonwovens reveal lower crystallinity and slightly larger lamellar long period (L p ) but a higher level of macroscopic fiber alignment and molecular chain orientation. These morphology and microstructure differences provide a good explanation for the superior mechanical property of TA PPS nonwovens with higher elastic modulus and tensile strength. The results are helpful in deepening the understanding of essential physical pictures of PPS nonwovens and promoting the development of the high-temperature nonwoven industry.

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Polymers Containing Sulfur, Poly(Phenylene Sulfide)

Cited by 2 publications

References 87 publications

Influence of Semicrystalline Morphology on the Physical Aging Characteristics of Poly(phenylene sulfide)

Influence of Semicrystalline Morphology on the Physical Aging Characteristics of Poly(phenylene sulfide)

Heat-setting Effect on the Morphology and Phase Structures of PPS Nonwovens

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