Nonisothermal crystallization kinetics of poly(β‐hydroxybutyrate)

Crystallization Retardation of Ultrathin Films of Poly[(R)-3-hydroxybutyrate] and a Random Copolymer Poly[(R)-3-hydroxybutyrate-co-(R)-3-hydroxyhexanoate] on an Aluminum Oxide Surface

“…20,22 In addition, k for PHB/Au is high, equivalent to a bulk crystallization rate at 48 or 90 °C. 36 This is an additional line of evidence that, for this particular sample, the nucleation starts during cooling, consistent with the previous IR observation. However, the k values for polymers on aluminum, in general, are around 3 to 4 orders of magnitude less than those found on gold.…”

“…We found that on gold, all the polymers show a rate constant, k, with comparable order of magnitude with respect to that found in the bulk. 36 This observation suggests that we have an ultrathin film system with comparable crystallization kinetics compared to the bulk. This result is most likely because the chain has enhanced mobility on the film/air interface and has a weakened mobility on the substrate surface, leading to the two effects canceling out each other, giving rise to bulk-like crystallization kinetics.…”

Melting and crystallization of poly(3-hydroxybutyrate): effect of heating/cooling rates on phase transformation

“…Considerations of the microstructure implication of these trends require a microkinetic study [23][24][25][26] beyond the scope of this paper. However, the results presented in Tables 3, 4 and Figures 6, 7 suggest that controlling the cooling/heating rate may result in crystals grown at different temperature intervals, perhaps with different stabilities and microstructures.…”

Kinetics of Cold Crystallization of 4-Cyano-3-fluorophenyl 4-Butylbenzoate (4CFPB) Glass Forming Liquid Crystal. I. Nonisothermal Process As Studied by Microscopic, Calorimetric, and Dielectric Methods

“…The Ozawa equation, with only two adjustable parameters Z(T) and n 0 (T), is not adequate as crystallization kinetics differs essentially at low and high crystallinity. 23,24 Recently, for analysis of the nonisothermal crystallization process, a new method has been proposed by Mo et al 23,24 When compared, the Avrami (eq 1) and Ozawa (eq 2) equations for each given value of crystallinity D the following is valid…”

“…In the case of faster heating, log Z ( T ) and n 0 may be regarded only as fitting parameters without clear physical meaning, which is especially true for DSC data. The Ozawa equation, with only two adjustable parameters Z ( T ) and n 0 ( T ), is not adequate as crystallization kinetics differs essentially at low and high crystallinity. , …”