In-situ synchrotron WAXD/SAXS studies of structural development during PBO/PPA solution spinning

Shaofeng Ran; Christian Burger; Dufei Fang; Xinhua Zong; Sharon Cruz; Benjamin Chu; Benjamin S. Hsiao; Robert A. Bubeck; Kazuyuki Yabuki; Yoshihiko Teramoto; David C. Martin; Michael A. Johnson; Philip M. Cunniff

doi:10.1021/ma010249g

In-situ synchrotron WAXD/SAXS studies of structural development during PBO/PPA solution spinning

Shaofeng Ran
, Christian Burger
, Dufei Fang
, Xinhua Zong
, Sharon Cruz
, Benjamin Chu
, Benjamin S. Hsiao
, Robert A. Bubeck
, Kazuyuki Yabuki
, Yoshihiko Teramoto
, David C. Martin
, Michael A. Johnson
, Philip M. Cunniff

Chemistry

Stony Brook University
Michigan Molecular Institute
Toyobo Co., Ltd.
University of Michigan, Ann Arbor
Soldier/Biol. C.C.

Research output: Contribution to journal › Article › peer-review

48 Scopus citations

Abstract

Combined wide-angle X-ray diffraction (WAXD) and small-angle X-ray scattering (SAXS) studies using synchrotron radiation were carried out to investigate the structural development during in-situ solution spinning of poly(p-phenylenebenzobisoxazole) (PBO) in poly(phosphoric acid) (PPA). WAXD patterns indicated that the structure in the extruded PBO/PPA dope before coagulation (in water) possessed lyotropic "biaxial nematic" nematic order involving PBO-PPA complex as the mesogenic unit. A different biaxial nematic order in pure PBO was found to develop immediately upon coagulation in water. When the coagulation time exceeded 30 min, the complex PBO/PPA structure completely disappeared, and well-oriented PBO crystals were formed. The meridian peaks exhibited long streaks, indicating a translational disorder of PBO molecules in the fiber direction. SAXS patterns of the PBO fiber after coagulation showed equatorial streaks with no further maxima observed, which is attributed to a microvoid structure.

Original language	English
Pages (from-to)	433-439
Number of pages	7
Journal	Macromolecules
Volume	35
Issue number	2
DOIs	https://doi.org/10.1021/ma010249g
State	Published - Jan 15 2002

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@article{427b87a4a57e4fe0971e92865ac2abd6,

title = "In-situ synchrotron WAXD/SAXS studies of structural development during PBO/PPA solution spinning",

abstract = "Combined wide-angle X-ray diffraction (WAXD) and small-angle X-ray scattering (SAXS) studies using synchrotron radiation were carried out to investigate the structural development during in-situ solution spinning of poly(p-phenylenebenzobisoxazole) (PBO) in poly(phosphoric acid) (PPA). WAXD patterns indicated that the structure in the extruded PBO/PPA dope before coagulation (in water) possessed lyotropic {"}biaxial nematic{"} nematic order involving PBO-PPA complex as the mesogenic unit. A different biaxial nematic order in pure PBO was found to develop immediately upon coagulation in water. When the coagulation time exceeded 30 min, the complex PBO/PPA structure completely disappeared, and well-oriented PBO crystals were formed. The meridian peaks exhibited long streaks, indicating a translational disorder of PBO molecules in the fiber direction. SAXS patterns of the PBO fiber after coagulation showed equatorial streaks with no further maxima observed, which is attributed to a microvoid structure.",

author = "Shaofeng Ran and Christian Burger and Dufei Fang and Xinhua Zong and Sharon Cruz and Benjamin Chu and Hsiao, \{Benjamin S.\} and Bubeck, \{Robert A.\} and Kazuyuki Yabuki and Yoshihiko Teramoto and Martin, \{David C.\} and Johnson, \{Michael A.\} and Cunniff, \{Philip M.\}",

year = "2002",

month = jan,

day = "15",

doi = "10.1021/ma010249g",

language = "English",

volume = "35",

pages = "433--439",

journal = "Macromolecules",

issn = "0024-9297",

number = "2",

}

TY - JOUR

T1 - In-situ synchrotron WAXD/SAXS studies of structural development during PBO/PPA solution spinning

AU - Ran, Shaofeng

AU - Burger, Christian

AU - Fang, Dufei

AU - Zong, Xinhua

AU - Cruz, Sharon

AU - Chu, Benjamin

AU - Hsiao, Benjamin S.

AU - Bubeck, Robert A.

AU - Yabuki, Kazuyuki

AU - Teramoto, Yoshihiko

AU - Martin, David C.

AU - Johnson, Michael A.

AU - Cunniff, Philip M.

PY - 2002/1/15

Y1 - 2002/1/15

N2 - Combined wide-angle X-ray diffraction (WAXD) and small-angle X-ray scattering (SAXS) studies using synchrotron radiation were carried out to investigate the structural development during in-situ solution spinning of poly(p-phenylenebenzobisoxazole) (PBO) in poly(phosphoric acid) (PPA). WAXD patterns indicated that the structure in the extruded PBO/PPA dope before coagulation (in water) possessed lyotropic "biaxial nematic" nematic order involving PBO-PPA complex as the mesogenic unit. A different biaxial nematic order in pure PBO was found to develop immediately upon coagulation in water. When the coagulation time exceeded 30 min, the complex PBO/PPA structure completely disappeared, and well-oriented PBO crystals were formed. The meridian peaks exhibited long streaks, indicating a translational disorder of PBO molecules in the fiber direction. SAXS patterns of the PBO fiber after coagulation showed equatorial streaks with no further maxima observed, which is attributed to a microvoid structure.

AB - Combined wide-angle X-ray diffraction (WAXD) and small-angle X-ray scattering (SAXS) studies using synchrotron radiation were carried out to investigate the structural development during in-situ solution spinning of poly(p-phenylenebenzobisoxazole) (PBO) in poly(phosphoric acid) (PPA). WAXD patterns indicated that the structure in the extruded PBO/PPA dope before coagulation (in water) possessed lyotropic "biaxial nematic" nematic order involving PBO-PPA complex as the mesogenic unit. A different biaxial nematic order in pure PBO was found to develop immediately upon coagulation in water. When the coagulation time exceeded 30 min, the complex PBO/PPA structure completely disappeared, and well-oriented PBO crystals were formed. The meridian peaks exhibited long streaks, indicating a translational disorder of PBO molecules in the fiber direction. SAXS patterns of the PBO fiber after coagulation showed equatorial streaks with no further maxima observed, which is attributed to a microvoid structure.

UR - https://www.scopus.com/pages/publications/0037080551

U2 - 10.1021/ma010249g

DO - 10.1021/ma010249g

M3 - Article

AN - SCOPUS:0037080551

SN - 0024-9297

VL - 35

SP - 433

EP - 439

JO - Macromolecules

JF - Macromolecules

IS - 2

ER -

In-situ synchrotron WAXD/SAXS studies of structural development during PBO/PPA solution spinning

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