crystallinityII - EMA 6165 - Polymer Physics Crystallinity...

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07/21/11 EMA 6165 Polymer Physics - Lecture 1 EMA 6165 - Polymer Physics Crystallinity Lecture 32 Professor Anthony Brennan Department of Materials Science & Engineering University of Florida
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07/21/11 EMA 6165 Polymer Physics - Lecture 2 Rate of growth If h f is known one can calculate σ e Huseby, Bair, Salovey measured P.E. that was gamma irradiated to prevent thickening σ e = 93 ± 8 ergs/cm 2 T m o = 146 o C
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07/21/11 EMA 6165 Polymer Physics - Lecture 3 Rate of growth at high T ( 29 ∆ ∆ f h T T f f m o = where ( 29 f T T T m o = + 2
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07/21/11 EMA 6165 Polymer Physics - Lecture 4 Rate of growth Isotactic PS: T m = 242 o C T g = 110 o C T = 132 o C Still crystallizes Normally h f does not change as a function of temperature - HOWEVER -
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07/21/11 EMA 6165 Polymer Physics - Lecture 5 Rate of growth Hoffman does not account for surface roughness in this model whereas others have via the term, for l g f l e * =  + 2 σ δ isothermal conditions
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07/21/11 EMA 6165 Polymer Physics - Lecture 6 Rate of growth When v “stems” and v f = v - 1 “folds” have been formed the free energy of formation (ignoring chain ends) ( 29 ∆φ v fold energy work f e surfaceenergy of fold bl v ab = + 2 2 σ σ + vabl f for v >>1
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This note was uploaded on 07/20/2011 for the course EMA 6165 taught by Professor Brennan during the Spring '08 term at University of Florida.

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crystallinityII - EMA 6165 - Polymer Physics Crystallinity...

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