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- W2138499732 abstract "Poly(tetramethyl-p-silphenylene siloxane) crystal mats initially prepared from benzene/methanol (2:1 v/v), when annealed in small amounts of solvent undergo considerable thickening in the chain direction. When the crystals are annealed above their formation temperature, their physical properties change rapidly at first before reaching an asymptotic limit commensurate with annealing time and type of solvent. Changes in melting temperature, heat of fusion, small-angle x-ray spacing, and wide-angle x-ray scattering patterns have been monitored for three solvents of varying solvent power, ranging from very good to extremely poor. Upon solution annealing, the original crystals mats equilibrate to more stable dimensions compatible with their environment. The activation energy of crystal thickening in contact with a liquid is estimated to be about an order of magnitude lower than that deduced from dry annealing data. It appears that the crystal surface and the crystalline core of the crystals comprising the mats must participate in the measured severalfold increase in long period noted after annealing. The lower surface (or interfacial) energy of the liquid annealed mats compared to isothermally melt-crystallized polymer of similar molecular weight has a direct bearing on the polymer morphology and crystallinity." @default.
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- W2138499732 date "1984-02-01" @default.
- W2138499732 modified "2023-09-25" @default.
- W2138499732 title "Solution annealing of poly(TMPS) crystal mats" @default.
- W2138499732 doi "https://doi.org/10.1002/pol.1984.180220207" @default.
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