Abstract
PBZO's having average molecular length of 27,49 and 128 nm were crystallized from dilute solution in conc.H2SO2. At high crystallization temperature, the shorter PBZO (L∼30nm) formed lath shaped lamellar crystals. Electron diffraction indicated that the long axis of the lamella to be along the crystallographic b-axis forming 100 twins, and that the molecular chains was perpendicular to the lamella. High resolution electron micrograph showed that 100 lattice fringe had an orientation distribution and curved within one crystallite. Decrease in crystallization temperature and/or increase in the chain length changed the morphology essentially into flat fibrils. Branchings through repetitive twinning across {100} and [formula-ommited] planes lead to a square network. Vacancies in the fibrillar network were finally filled by post lamellar growth resuting in a mosaic structure, except with PBZO of the longest molecular chain. Oriented rigid cilia on the lamellar surface facilitated the growth rate of daughter crystals and regulated their orientation.
| Original language | English |
|---|---|
| Pages (from-to) | 374-378 |
| Number of pages | 5 |
| Journal | Sen'i Gakkaishi |
| Volume | 54 |
| Issue number | 7 |
| DOIs | |
| Publication status | Published - 1998 |
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ASJC Scopus subject areas
- Chemical Engineering (miscellaneous)
- Materials Science (miscellaneous)
- Polymers and Plastics
- Industrial and Manufacturing Engineering
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Crystallization of poly (p-phenylene benzobisoxazole) from dilute solution. / Shimamura, Kaoru; Uchida, Tetsuya; Suzuki, Makoto; Zhang, Chunxiao.
In: Sen'i Gakkaishi, Vol. 54, No. 7, 1998, p. 374-378.Research output: Contribution to journal › Article
}
TY - JOUR
T1 - Crystallization of poly (p-phenylene benzobisoxazole) from dilute solution
AU - Shimamura, Kaoru
AU - Uchida, Tetsuya
AU - Suzuki, Makoto
AU - Zhang, Chunxiao
PY - 1998
Y1 - 1998
N2 - PBZO's having average molecular length of 27,49 and 128 nm were crystallized from dilute solution in conc.H2SO2. At high crystallization temperature, the shorter PBZO (L∼30nm) formed lath shaped lamellar crystals. Electron diffraction indicated that the long axis of the lamella to be along the crystallographic b-axis forming 100 twins, and that the molecular chains was perpendicular to the lamella. High resolution electron micrograph showed that 100 lattice fringe had an orientation distribution and curved within one crystallite. Decrease in crystallization temperature and/or increase in the chain length changed the morphology essentially into flat fibrils. Branchings through repetitive twinning across {100} and [formula-ommited] planes lead to a square network. Vacancies in the fibrillar network were finally filled by post lamellar growth resuting in a mosaic structure, except with PBZO of the longest molecular chain. Oriented rigid cilia on the lamellar surface facilitated the growth rate of daughter crystals and regulated their orientation.
AB - PBZO's having average molecular length of 27,49 and 128 nm were crystallized from dilute solution in conc.H2SO2. At high crystallization temperature, the shorter PBZO (L∼30nm) formed lath shaped lamellar crystals. Electron diffraction indicated that the long axis of the lamella to be along the crystallographic b-axis forming 100 twins, and that the molecular chains was perpendicular to the lamella. High resolution electron micrograph showed that 100 lattice fringe had an orientation distribution and curved within one crystallite. Decrease in crystallization temperature and/or increase in the chain length changed the morphology essentially into flat fibrils. Branchings through repetitive twinning across {100} and [formula-ommited] planes lead to a square network. Vacancies in the fibrillar network were finally filled by post lamellar growth resuting in a mosaic structure, except with PBZO of the longest molecular chain. Oriented rigid cilia on the lamellar surface facilitated the growth rate of daughter crystals and regulated their orientation.
UR - http://www.scopus.com/inward/record.url?scp=84906816420&partnerID=8YFLogxK
UR - http://www.scopus.com/inward/citedby.url?scp=84906816420&partnerID=8YFLogxK
U2 - 10.2115/fiber.54.7_374
DO - 10.2115/fiber.54.7_374
M3 - Article
AN - SCOPUS:84906816420
VL - 54
SP - 374
EP - 378
JO - Sen'i Gakkaishi
JF - Sen'i Gakkaishi
SN - 0037-9875
IS - 7
ER -