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Compaction and Sintering UHMWPE Reactor Powders pp. 153-175 $100.00
Authors:  (V.A. Aulov, N.F. Bakeev, S.N. Chvalun, A.N. Ozerin)
Abstract:
The optimum conditions for compaction and rolling of UHMWPE reactor powders
to prepare HIGH strength filaments and fibers are discussed. The comparative analysis of
some reactor powders (of the same Mw but different specific surface area S) and with
different drawability are presented. The structural changes with compaction and
monolithization has been studied. High-strength filaments can be obtained only from
powders with a high S value. It is established that three sequential deformation processes
take place during compression of a powder pellet under increasing pressure in a closed
volume. In the first step, the powder particles in a pellet are brought into closer contact
and the pellet density increases. Upon reaching a sufficiently large number of contacts,
this densification process ceases and the plastic deformation of individual grains becomes
a dominating process. This very important stage features the formation of bonds between
separate RP grains. As the pressure grows further, the material density increases due to
the elastic deformation; this step does not contribute to the final density and strength of
the RP pellet upon the pressure release. The average pore size (powder density) of the
initial RP pellets is a critical parameter: the effective compaction under pressure takes
place only for the RP samples with a powder density below 0.150 g/cm3. As concerns to
further orientation drawing of sintered UHMWPE reactor powder, there is an optimal
compression strain λpd , at which the limit draw ratio increases in a stepwise manner.
(λpd=2,5) The different behavior observed upon monolithization of UHMWPE reactor
powders is due to the specific morphological structure determined to a considerable
extent by their synthesis conditions. It is assumed that at the certain conditions
amorphous regions haves been formed by entangled tie molecules intervening
neighboring crystallites. It is the presence of such regions that makes the grains of this
powder harder and incapable to of plastic deformation and coupling to one another upon
monolithization. 


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Compaction and Sintering UHMWPE Reactor Powders pp. 153-175