Selective CO2 Sequestration with Monolithic Bimodal Micro/Macroporous Carbon Aerogels Derived from Stepwise Pyrolytic Decomposition of Polyamide-Polyimide-Polyurea Random Copolymers

Adnan M. Saeed; Parwani M. Rewatkar; Hojat Majedi Far; Tahereh Taghvaee; Suraj Donthula; Chandana Mandal; Chariklia Sotiriou-Leventis; Nicholas Leventis

doi:10.1021/acsami.7b01910

Selective CO2 Sequestration with Monolithic Bimodal Micro/Macroporous Carbon Aerogels Derived from Stepwise Pyrolytic Decomposition of Polyamide-Polyimide-Polyurea Random Copolymers

ACS Applied Materials & Interfaces ◽

10.1021/acsami.7b01910 ◽

2017 ◽

Vol 9 (15) ◽

pp. 13520-13536 ◽

Cited By ~ 20

Author(s):

Adnan M. Saeed ◽

Parwani M. Rewatkar ◽

Hojat Majedi Far ◽

Tahereh Taghvaee ◽

Suraj Donthula ◽

...

Keyword(s):

Co2 Sequestration ◽

Random Copolymers ◽

Carbon Aerogels ◽

Pyrolytic Decomposition ◽

Macroporous Carbon

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Electron microscopy of crystalline structure in thermotropic random copolymers

Proceedings, annual meeting, Electron Microscopy Society of America ◽

10.1017/s0424820100089585 ◽

1991 ◽

Vol 49 ◽

pp. 1054-1055

Author(s):

Afzana Anwer ◽

S. Eilidh Bedford ◽

Richard J. Spontak ◽

Alan H. Windle

Keyword(s):

Electron Microscopy ◽

Crystalline Structure ◽

Liquid Crystalline ◽

Elevated Temperatures ◽

Random Copolymers ◽

Molecular Characteristics ◽

Scanning Calorimetry ◽

X Ray ◽

Identical Monomer ◽

Periodic Layer

Random copolyesters composed of wholly aromatic monomers such as p-oxybenzoate (B) and 2,6-oxynaphthoate (N) are known to exhibit liquid crystalline characteristics at elevated temperatures and over a broad composition range. Previous studies employing techniques such as X-ray diffractometry (XRD) and differential scanning calorimetry (DSC) have conclusively proven that these thermotropic copolymers can possess a significant crystalline fraction, depending on molecular characteristics and processing history, despite the fact that the copolymer chains possess random intramolecular sequencing. Consequently, the nature of the crystalline structure that develops when these materials are processed in their mesophases and subsequently annealed has recently received considerable attention. A model that has been consistent with all experimental observations involves the Non-Periodic Layer (NPL) crystallite, which occurs when identical monomer sequences enter into register between adjacent chains. The objective of this work is to employ electron microscopy to identify and characterize these crystallites.

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