Origin of Transcrystallinity and Nucleation Kinetics in Polybutene-1/Fiber Composites

• DOI: 10.1021/acs.macromol.0c02038
• Publication Date: 2020-10-16T20:45:55Z
• Authors: Wei Wang; Bao Wang; Agnieszka Tercjak; Alejandro J. Müller; Zhe Ma; Dario Cavallo
• Keywords: Polybutene

This work presents an in-depth study of fiber-induced nucleation and crystalline morphology in polybutene-1/single-fiber composites. The ability various fibers, including carbon, glass, polypropylene (PP), poly(l-lactide) (PLLA), stereocomplex (SC)-poly(lactide), is investigated via polarized optical microscopy. A polybutene-1 (PB-1) fiber made the trigonal Form I polymorph also adopted all-PB-1 composite. Two different types morphologies PB-1 II developed on surface fibers during isothermal crystallization. They are a transcrystalline layer (TCL) only hybrid shish–calabash (HSC) all other fibers. Upon nonisothermal crystallization, transition from HSC to TCL for sole PP found. Quantitative studies kinetics showed that lowest free-energy barrier exhibited by fiber, due occurrence cross-nucleation with II, possibly epitaxial matching. On hand, highest energy despite very similar chemical constitution. Moreover, large variation pre-exponential factor rate among suggests major differences available sites per unit area. number such found inversely correlate roughness and, first time, used understand obtainable morphology. In fact, we show that, notwithstanding height nucleation, can be obtained when sufficiently high provided.