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Authors
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Quattrosoldi, S. ; Androsch, R. ; Janke, A. ; Soccio, M. ; Lotti, N.
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Title
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Enthalpy relaxation, crystal nucleation and crystal growth of biobased poly(butylene ssophthalate)
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Date
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18.01.2020
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Number
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58126
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Abstract
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The crystallization behavior of fully biobased poly(butylene isophthalate) (PBI) has been investigated using calorimetric and microscopic techniques. PBI is an extremely slow crystallizing polymer that leads, after melt-crystallization, to the formation of lamellar crystals and rather large spherulites, due to the low nuclei density. Based upon quantitative analysis of the crystal-nucleation behavior at low temperatures near the glass transition, using Tammann’s two-stage nuclei development method, a nucleation pathway for an acceleration of the crystallization process and for tailoring the semicrystalline morphology is provided. Low-temperature annealing close to the glass transition temperature (Tg) leads to the formation of crystal nuclei, which grow to crystals at higher temperatures, and yield a much finer spherulitic superstructure, as obtained after direct melt-crystallization. Similarly to other slowly crystallizing polymers like poly(ethylene terephthalate) or poly(l-lactic acid), low-temperature crystal-nuclei formation at a timescale of hours/days is still too slow to allow non-spherulitic crystallization. The interplay between glass relaxation and crystal nucleation at temperatures slightly below Tg is discussed
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Publisher
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Polymers
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Wikidata
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Citation
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Polymers 12 (2020) 235
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DOI
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https://doi.org/10.3390/POLYM12010235
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Tags
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poly(butylene isophthalate) biopolymer crystallization crystal nucleation crystal growth enthalpy relaxation semicrystalline morphology fast scanning chip calorimetry (fsc) tammann’s nuclei development method
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