TY - GEN
T1 - The path to "single-component composites": An in situ X-ray study of melting and crystallization of extended-chain polyethylene fibers under pressure
AU - Shavit-Hadar, Liron
AU - Rein, Dmitry M.
AU - Khalfin, Rafail
AU - Cohen, Yachin
AU - Terry, Ann E.
AU - Rastogi, Sanjay
N1 - Generated from Scopus record by KAUST IRTS on 2021-02-16
PY - 2005/8/1
Y1 - 2005/8/1
N2 - "Single component" polymer composites, in which both the reinforcement and the matrix are made of the same polymer, are currently fabricated by subjecting oriented fibers to moderate pressure and temperature in a processing scheme termed "reversed pressure compaction". In order to elucidate the nature of the transformations that lead from fibers to a monolithic composite, an X-ray diffraction study with a pressure cell was performed using synchrotron X-ray radiation (Beamline ID-11, ESRF). We observed a transition from the orthorhombic crystal to the meso-morphic hexagonal phase upon heating even at a low pressure (100 bar). The hexagonal phase also reappears even upon cooling from the melt. These indicate that the path to high-performance composites from the oriented PE fibers occurs via sintering of the hexagonal phase. This phase allows enough chain mobility for the compaction process yet maintains the chain orientation to a large extent. © 2005 Elsevier B.V. All rights reserved.
AB - "Single component" polymer composites, in which both the reinforcement and the matrix are made of the same polymer, are currently fabricated by subjecting oriented fibers to moderate pressure and temperature in a processing scheme termed "reversed pressure compaction". In order to elucidate the nature of the transformations that lead from fibers to a monolithic composite, an X-ray diffraction study with a pressure cell was performed using synchrotron X-ray radiation (Beamline ID-11, ESRF). We observed a transition from the orthorhombic crystal to the meso-morphic hexagonal phase upon heating even at a low pressure (100 bar). The hexagonal phase also reappears even upon cooling from the melt. These indicate that the path to high-performance composites from the oriented PE fibers occurs via sintering of the hexagonal phase. This phase allows enough chain mobility for the compaction process yet maintains the chain orientation to a large extent. © 2005 Elsevier B.V. All rights reserved.
UR - https://linkinghub.elsevier.com/retrieve/pii/S0168583X05009195
UR - http://www.scopus.com/inward/record.url?scp=25144491667&partnerID=8YFLogxK
U2 - 10.1016/j.nimb.2005.06.015
DO - 10.1016/j.nimb.2005.06.015
M3 - Conference contribution
SP - 39
EP - 42
BT - Nuclear Instruments and Methods in Physics Research, Section B: Beam Interactions with Materials and Atoms
ER -