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Understanding the Critical Parameters of the PAMS Mandrel Fabrication Process

Suhas Bhandarkar, Reny Paguio, Fred Elsner, Denise Hoover, Abbas Nikroo, Chris Guido

Fusion Science and Technology / Volume 70 / Number 2 / August-September 2016 / Pages 127-136

Technical Paper / dx.doi.org/10.13182/FST15-245

First Online Publication:July 5, 2016
Updated:August 9, 2016

In this paper, we describe the reasoning that leads us to focus on the so-called curing process where a solid poly(α-methylstyrene) (PAMS) shell is formed from the initial solution phase. We demonstrate the existence of a percolation zone at about 55 wt% PAMS, beyond which the roundness of the shell can be expected to be irreversible. Using a simple model and a few supporting experiments to account for the rate of mass transfer of the fluorobenzene solvent phase, we show that curing rate is determined almost entirely by just a short exposure, to the sweeping gas, of the shells that graze the free surface of the curing bath as they move around in it. We propose here that specific control of the curing conditions at percolation would enable rounder mandrels.

 
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