Abstract
Fractionation of the rigid polymer, poly(p-phenylene benzobisthiazole) (PBZT), was carried out in dilute solution in concentrated methane sulfuric acid (MSA) using silica gels as packing material of a column. Several combinations of the average chain length of the fractionating materials and the average pore diameter of the gels were examined to improve fractionation resolution. The gels with average pore diameter near the average chain length resulted in high fractionation resolution. Single crystals of the fractionated and unfractionated PBZTs were observed by transmission electron microscopy (TEM). Both single crystals were fundamentally composed of rod crystals with the chain orienting normal to the rods. The unfractionated PBZT made a cluster of parallel rod crystals, where longer chains penetrated a few rod crystals leaving their chain ends within the crystalline core. On the contrary, with the fractionated polymer, extended-chain rod-like crystals were dispersed, isolated from each other. This morphology enables us to estimate the chain length visibly by TEM, for which a few milligrams of the material is enough for the observation.
| Original language | English |
|---|---|
| Pages (from-to) | 1015-1024 |
| Number of pages | 10 |
| Journal | Journal of Macromolecular Science - Physics |
| Volume | 43 B |
| Issue number | 5 |
| DOIs | |
| Publication status | Published - Sep 2004 |
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Keywords
- Chain disorientation within a crystallite
- Fractionation
- Molecular length distribution
- Rigid polymer
- Single crystal
ASJC Scopus subject areas
- Polymers and Plastics
- Materials Chemistry
Cite this
Fractionation and crystal morphology of rigid polymer, Poly(p-phenylene benzobisthiazole). / Shimamura, Kaoru; Michiaki, Nobuyuki; Ikeda, Takaya; Uchida, Tetsuya; Hirao, Manabu.
In: Journal of Macromolecular Science - Physics, Vol. 43 B, No. 5, 09.2004, p. 1015-1024.Research output: Contribution to journal › Article
}
TY - JOUR
T1 - Fractionation and crystal morphology of rigid polymer, Poly(p-phenylene benzobisthiazole)
AU - Shimamura, Kaoru
AU - Michiaki, Nobuyuki
AU - Ikeda, Takaya
AU - Uchida, Tetsuya
AU - Hirao, Manabu
PY - 2004/9
Y1 - 2004/9
N2 - Fractionation of the rigid polymer, poly(p-phenylene benzobisthiazole) (PBZT), was carried out in dilute solution in concentrated methane sulfuric acid (MSA) using silica gels as packing material of a column. Several combinations of the average chain length of the fractionating materials and the average pore diameter of the gels were examined to improve fractionation resolution. The gels with average pore diameter near the average chain length resulted in high fractionation resolution. Single crystals of the fractionated and unfractionated PBZTs were observed by transmission electron microscopy (TEM). Both single crystals were fundamentally composed of rod crystals with the chain orienting normal to the rods. The unfractionated PBZT made a cluster of parallel rod crystals, where longer chains penetrated a few rod crystals leaving their chain ends within the crystalline core. On the contrary, with the fractionated polymer, extended-chain rod-like crystals were dispersed, isolated from each other. This morphology enables us to estimate the chain length visibly by TEM, for which a few milligrams of the material is enough for the observation.
AB - Fractionation of the rigid polymer, poly(p-phenylene benzobisthiazole) (PBZT), was carried out in dilute solution in concentrated methane sulfuric acid (MSA) using silica gels as packing material of a column. Several combinations of the average chain length of the fractionating materials and the average pore diameter of the gels were examined to improve fractionation resolution. The gels with average pore diameter near the average chain length resulted in high fractionation resolution. Single crystals of the fractionated and unfractionated PBZTs were observed by transmission electron microscopy (TEM). Both single crystals were fundamentally composed of rod crystals with the chain orienting normal to the rods. The unfractionated PBZT made a cluster of parallel rod crystals, where longer chains penetrated a few rod crystals leaving their chain ends within the crystalline core. On the contrary, with the fractionated polymer, extended-chain rod-like crystals were dispersed, isolated from each other. This morphology enables us to estimate the chain length visibly by TEM, for which a few milligrams of the material is enough for the observation.
KW - Chain disorientation within a crystallite
KW - Fractionation
KW - Molecular length distribution
KW - Rigid polymer
KW - Single crystal
UR - http://www.scopus.com/inward/record.url?scp=5744242395&partnerID=8YFLogxK
UR - http://www.scopus.com/inward/citedby.url?scp=5744242395&partnerID=8YFLogxK
U2 - 10.1081/MB-200033280
DO - 10.1081/MB-200033280
M3 - Article
AN - SCOPUS:5744242395
VL - 43 B
SP - 1015
EP - 1024
JO - Journal of Macromolecular Science - Reviews in Macromolecular Chemistry and Physics
JF - Journal of Macromolecular Science - Reviews in Macromolecular Chemistry and Physics
SN - 1558-3724
IS - 5
ER -