The Crystalline Structure of Nascent Ultra High Molecular Weight Single Particles and Its Change on Heating, as Revealed by in-situ Synchrotron Studies. / Myasnikova, Liubov; Baidakova, Marina; Drobot’ko, Valerii et al.
In: Journal of Macromolecular Science, Part B: Physics, Vol. 58, No. 11, 02.11.2019, p. 847-859.Research output: Contribution to journal › Article › peer-review
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TY - JOUR
T1 - The Crystalline Structure of Nascent Ultra High Molecular Weight Single Particles and Its Change on Heating, as Revealed by in-situ Synchrotron Studies
AU - Myasnikova, Liubov
AU - Baidakova, Marina
AU - Drobot’ko, Valerii
AU - Ivanchev, Sergei
AU - Ivan’kova, Elena
AU - Radovanova, Elena
AU - Yagovkina, Maria
AU - Marikhin, Vyacheslav
AU - Zubavichus, Yan
AU - Dorovatovskii, Pavel
N1 - Publisher Copyright: © 2019, © 2019 Taylor & Francis Group, LLC.
PY - 2019/11/2
Y1 - 2019/11/2
N2 - A solvent-free route to high performance ultra-high molecular weight polyethylene (UHMWPE) film threads is currently under intensive development. It involves compaction/sintering of UHMWPE reactor powder at T < Tm followed by orientation hardening of the sintered film cut into narrow strips. However, not any kind of reactor powder can be transformed into the desired high-performance material. The presence of a monoclinic crystalline phase (MP) in the powder is considered as one of the key parameters indicating its applicability for solvent-free processing. Since the MP is stable only under stress, the assumption has been made that the observed MP is generated during tableting for X-ray analyses rather than during synthesis of the nascent powder. We show that comparative X-ray analysis of a tablet and a single “virgin” particle using synchrotron radiation indicates that the MP content in the virgin particle was far less than that in the compressed tablet. Only the (001) MP peak was resolved while the others were severely overlapped with the normal, orthorhombic reflections. Thus, it supports our idea that the widely observed MP phase is, for the most part, generated during the sample preparation for the X-ray analyses.
AB - A solvent-free route to high performance ultra-high molecular weight polyethylene (UHMWPE) film threads is currently under intensive development. It involves compaction/sintering of UHMWPE reactor powder at T < Tm followed by orientation hardening of the sintered film cut into narrow strips. However, not any kind of reactor powder can be transformed into the desired high-performance material. The presence of a monoclinic crystalline phase (MP) in the powder is considered as one of the key parameters indicating its applicability for solvent-free processing. Since the MP is stable only under stress, the assumption has been made that the observed MP is generated during tableting for X-ray analyses rather than during synthesis of the nascent powder. We show that comparative X-ray analysis of a tablet and a single “virgin” particle using synchrotron radiation indicates that the MP content in the virgin particle was far less than that in the compressed tablet. Only the (001) MP peak was resolved while the others were severely overlapped with the normal, orthorhombic reflections. Thus, it supports our idea that the widely observed MP phase is, for the most part, generated during the sample preparation for the X-ray analyses.
KW - Annealing
KW - phase transition
KW - sintering
KW - synchrothron
KW - UHMWPE reactor powder
KW - X-ray diffraction
KW - TRANSFORMATION
KW - COMPACTION
KW - POLYMERIZATION
KW - POLYETHYLENE REACTOR POWDERS
KW - TAPES
KW - DENSITY
KW - PHASE
KW - NMR
KW - MORPHOLOGY
UR - http://www.scopus.com/inward/record.url?scp=85071195141&partnerID=8YFLogxK
U2 - 10.1080/00222348.2019.1654692
DO - 10.1080/00222348.2019.1654692
M3 - Article
AN - SCOPUS:85071195141
VL - 58
SP - 847
EP - 859
JO - Journal of Macromolecular Science, Part B: Physics
JF - Journal of Macromolecular Science, Part B: Physics
SN - 0022-2348
IS - 11
ER -
ID: 25464165