NDLI: Poor solvent as a nucleating agent to induce poly(ε-caprolactone) ultrathin film crystallization on poly(vinylpyrrolidone) substrate

Content Provider	Springer Nature Link
Author	Guo, Caixia Huo, Hong
Copyright Year	2016
Abstract	The poor solvent (hexanol)-induced crystallization of poly(ε-caprolactone) (PCL) ultrathin film on poly(vinylpyrrolidone) (PVPY) substrate is studied by using atomic force microscopy (AFM). PCL single crystals with screw dislocations melt and wet on PVPY substrate, forming a PCL ultrathin film with continuously changed film thickness. The effect of film thickness on the PCL crystallization morphology is directly observed by using the wetted PCL ultrathin film. Morphology transition from compact seaweed (CS) to fractal dendrite (FD) occurs with the decrease of the film thickness. A lot of dispersed FDs appear when PCL ultrathin film recrystallizes in the presence of minute amount of hexanol. We denote it as a “multi-nuclei” phenomenon. The content of residual hexanol is regulated by changing sample drying time under vacuum or sample melting temperature. Results show that the condition to obtain the highest nuclei density (or crystal density) is that the sample is dried under vacuum at room temperature for 24 h during sample preparation and melts at 200 °C for 10 min before recrystallization. If hexanol evaporates completely, the large area of FD grows continuously and no multi-nuclei phenomenon occurs. The interaction between PCL and PVPY substrate is excluded as the reason of the induction of multi-nuclei phenomenon. PVPY which blended in the PCL ultrathin film during the sample preparation is immiscible with PCL and inhibits the nucleation and crystallization of PCL. In this work, poor solvent provides us a new method to find nucleating agent for polymer thin films.
Starting Page	767
Ending Page	776
Page Count	10
File Format	PDF
ISSN	0303402X
Journal	Colloid and Polymer Science
Volume Number	294
Issue Number	4
e-ISSN	14351536
Language	English
Publisher	Springer Berlin Heidelberg
Publisher Date	2016-01-21
Publisher Place	Berlin/Heidelberg
Access Restriction	One Nation One Subscription (ONOS)
Subject Keyword	PCL single crystal Ultrathin film Solvent-induced crystallization Multi-nuclei phenomenon Hexanol Polymer Sciences Soft and Granular Matter, Complex Fluids and Microfluidics Characterization and Evaluation of Materials Physical Chemistry Food Science Nanotechnology and Microengineering
Content Type	Text
Resource Type	Article
Subject	Colloid and Surface Chemistry Materials Chemistry Physical and Theoretical Chemistry Polymers and Plastics

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