Crystal-like Array Formation in Phase Separation Induced by Radical Polymerization

Wang, Xin; Okada, Mamoru; Matsushita, Yushu; Furukawa, Hidemitsu; Han, Charles C.

doi:10.1021/ma050896y

Cited by 26 publications

(21 citation statements)

References 33 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…It was also found that, as quench is in process, the evolution of the wetting layer thickness could cross over to a faster growth when the preferential component was the minority component. At the initial time, the polymer mixture exhibited the usual droplet morphology based on the formation mechanism of nucleation and growth in the off-critical phase separation [206,207]. With the increasing time, the coalescence of the droplets occurs.…”

Section: -6mentioning

confidence: 99%

A computational study of surface-directed phase separation in polymer blends under temperature gradient

Tabatabaieyazdi¹

2021

Preprint

View full text Add to dashboard Cite

To apprehend the real industrial behavior of polymeric materials phase separation phenomenon, the nonlinear Cahn-Hilliard theory incorporating the Flory-Huggins-de Gennes free energy theory was used to study the non-uniform thermal-induced phase separation phenomenon in a symmetric binary polymer blend in which surface(s) with short- and long-range attraction to one polymer component compete with temperature gradient effects. The numerical results indicate that an increase of diffusion coefficient value will increase the rate of phase separation in the bulk but will decrease the growth rate of the wetting layer on the surface regardless of the surface potential strength. Also, the morphology transition from complete to partial wetting of the surface with short range surface attraction is successfully demonstrated. However, no partial wetting is observed for the surface with long-range potential. For shallow quenches, first, a growth rate of t 0.5 is observed in the early stage of spinodal decomposition phase separation at the surface and then a decline in the growth rate to t 0.13 in the intermediate stage occurred. For short- and long-range surface potential, the growth rate value of t 0.33 obtained in the bulk. The morphology results of temperature gradient effect on surface directed spinodal decomposition in short-range, long- range and multiple-surface attraction cases have been presented for the first time. It is realized that regardless of surface potential magnitude, surface enrichment is increased by higher temperature gradient (deep quenches on the side with no surface attraction). The studied models would provide more in depth understanding of polymer blendiprocesses.

show abstract

Section: -6mentioning

confidence: 99%

A computational study of surface-directed phase separation in polymer blends under temperature gradient

Tabatabaieyazdi¹

2021

Preprint

View full text Add to dashboard Cite

show abstract

“…Reaction‐induced phase separation during isothermal polymerization has been studied to control the morphology of aromatic polymers 10–17. The isothermal polymerization can induce phase separation from homogeneous liquid phase.…”

Section: Introductionmentioning

confidence: 99%

Morphosynthesis of poly[4‐(1,4‐phenylene)oxyphthalimide] and copolymers prepared by reaction‐induced crystallization during polymerization

Sawai

Wakabayashi

Yamazaki

et al. 2012

J Polym Sci B Polym Phys

View full text Add to dashboard Cite

Morphosynthesis of poly[4‐(1,4‐phenylene)oxyphthalimide] (POPI) and poly[4‐(1,4‐phenylene)oxyphthalimide‐co‐4‐phthalimide] (POPI‐PPI) was examined by using the crystallization during the polymerization. The POPI fibrillar crystals were obtained as precipitates with the formation of spherical aggregates of plate‐like crystals. Some of the POPI fibrillar crystals were longer than 15 μm. They possessed high crystallinity and the molecules aligned perpendicular to the long direction of the fibers. On the other hand, one‐dimensional structures of POPI‐PPI such as ribbon, cone, rod, and fiber were obtained as precipitates by the copolymerization. The copolymer molecules might align along the long direction of the cone‐like crystals. The morphology of these poly(ether‐imide)s could be controlled by not only the polymerization condition but also with the aid of copolymerization. © 2012 Wiley Periodicals, Inc. J Polym Sci Part B: Polym Phys, 2012

show abstract

“…Isothermal polymerizations can induce phase separation from homogeneous solution26–31 and the reaction‐induced phase separation during isothermal solution polymerization is a very useful method for the morphology control of poor processable polymers, because the morphology is created by the phase‐separation of oligomers 32, 33. This method is not limited by the processability of polymers.…”

Section: Introductionmentioning

confidence: 99%

Morphology control of various aromatic Polyimidazoles—preparation of nanofibers

Gong

Uchida

Yamazaki

et al. 2011

J of Applied Polymer Sci

View full text Add to dashboard Cite

Morphology of four kinds of aromatic polyimidazoles was examined by using reaction-induced crystallization during solution polymerization at a concentration of 1% at 350 C in liquid paraffin (LPF), dibenzyltoluene (DBT), and the mixture of these solvents. Aggregates of ribbon-like crystals of poly[2,6-(2,6-naphthalene)-benzobisimidazole] were obtained in LPF, and those of plate-like crystals were obtained in DBT/LPF-50 and in DBT. In contrast to this, the network structures of poly[2,2 0 -(2,6-naphthalene)-5,5 0 -bibenzimidazole)](PNT-BBI) nanofibers with the diameter of 25 to 90 nm was mainly obtained in DBT. The network structures of the PNT-BBI nanofibers could be recognized as nonwoven fabrics of the high-performance polymers. Imidazole trimers were precipitated to form the ribbon-like crystals and then they were continuously supplied from solution to grow the crystals. Molecular weight increased by the polymerization on the surface of the crystals when they crystallized and in the crystals. The initially formed aggregates of ribbon-like crystals changed to the nanofibers with time. In the case of poly[2,6-(4,4 0 -biphenylene)-benzobisimidazole] and poly[2,2 0 -(4,4 0 -biphenylene)-5,5 0 -bibenzimidazole)], they exhibited various morphologies such as spheres, lath-like crystals, and the spherical aggregates of lath-like crystals depending on the solvent, but fibers like PNT-BBI were not formed. The crystals obtained in this study possessed very high crystallinity and the outstanding thermal stability measured by TGA.

show abstract

Crystal-like Array Formation in Phase Separation Induced by Radical Polymerization

Cited by 26 publications

References 33 publications

A computational study of surface-directed phase separation in polymer blends under temperature gradient

A computational study of surface-directed phase separation in polymer blends under temperature gradient

Morphosynthesis of poly[4‐(1,4‐phenylene)oxyphthalimide] and copolymers prepared by reaction‐induced crystallization during polymerization

Morphology control of various aromatic Polyimidazoles—preparation of nanofibers

Contact Info

Product

Resources

About