Viscoelasticity and birefringence of syndiotactic polystyrene. I. Dynamic measurement in supercooled state

Inoue, Tadashi; Ryu, Deug-Soo; Osaki, Kunihiro; Takebe, Toshihiko

doi:10.1002/(sici)1099-0488(19990215)37:4<399::aid-polb13>3.0.co;2-c

Cited by 14 publications

(19 citation statements)

References 28 publications

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“…[13][14][15][16][17][18][19][20][21][22] The MSOR is considered to be a powerful tool also for epoxy glass to study its plastic deformation mechanism.…”

Section: )supporting

confidence: 69%

Molecular Cooperativity in Large Deformation and Subsequent Structural Relaxation for Epoxy Glass

Kawakami

2007

J. Soc. Rheol., Jpn

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In the present article, results from our recent studies on effects of chemical crosslinks in epoxy glass subjected to large deformation and subsequent aging under strain are reviewed. Bis-A type epoxy monomer was cured with DDM to form a sample with a crosslinked network structure. The monomer was also polymerized with aniline to form another sample with an uncrosslinked linear molecular structure. First, change in birefringence in the course of elongation was measured, and the modified stress-optical rule was applied to the experimental results. For the crosslinked sample, both internal potential and entropy changed in a small strain range. On the other hand, for the linear molecular sample only internal potential increased in a small strain range. Another series of results was obtained through thermomechanical experiments with largely deformed specimens, and the obtained results indicated that chemical crosslinks forced more rubbery strain to recover at temperatures below T g . From these studies it was proposed that chemical crosslinks in epoxy glass enhance cooperativity between molecular motions taking place in deformation as well as in subsequent retardation process. Such an effect of chemical crosslinks was also observed in the crosslinked sample under the state of aging under strain.

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“…[13][14][15][16][17][18][19][20][21][22] The MSOR is considered to be a powerful tool also for epoxy glass to study its plastic deformation mechanism.…”

Section: )supporting

confidence: 69%

Molecular Cooperativity in Large Deformation and Subsequent Structural Relaxation for Epoxy Glass

Kawakami

2007

J. Soc. Rheol., Jpn

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show abstract

“…The intensity of the transmitted light at each A. is related to the birefringence as follows. 11 ) can be obtained by solving eq 1.…”

Section: Apparatus and Methodsmentioning

confidence: 99%

“…Measurement was performed for atactic polystyrene (aPS)/ 0 syndiotactic polystyrene (sPS), 11 bisphenol A polycarbonate (PC), 10 poly( ethylene terephthalate) (PET), 12 and poly( ethylene naphthalate) (PEN). 10 Detailed studies of birefringence have been published for these materials.…”

Section: Methodsmentioning

confidence: 99%

“…The degree of crystallization was determined as 2.6%. 12 The sum of light intensities, Ij_+I 11 , and the ratio, Ij_/(Ij_+I 11 ), are given in the upper panel. The sum Ij_ + I 11 agreed well with I 0 , the intensity of transmitted light on removal of the specimen from the optical system.…”

Section: Examples Of Measurementsmentioning

confidence: 99%

“…+I 11 ) as seen in Figure 3 is evidently due to strain-induced crystallization. Similar behavior was not observed for aPS even when birefringence was very high.…”

Section: Effect Of Crystallizationmentioning

confidence: 99%

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