3 years ago

Manipulation of Crystallization Sequence in PEO-b-PCL Films Using Solvent Interactions

Manipulation of Crystallization Sequence in PEO-b-PCL Films Using Solvent Interactions
Christopher Nardi, Ryan M. Van Horn, Natasha Brigham, Allison Carandang, Kristi Allen
The physical structure of polymer films is important for understanding the observed macroscopic properties. In crystalline–crystalline block copolymers, the hierarchical nature of assembly is even more influential. Controlling this assembly process is crucial for tailoring film properties. In materials where crystallization of each block occurs nearly simultaneously, the ability to manipulate crystallization order is desirable. Poly(ethylene oxide)-b-poly(ε-caprolactone) (PEO-b-PCL) films were monitored via ATR-FTIR to determine the crystallization order during drying from varying solvents. PCL crystallized first from most solvents except toluene and ethyl acetate, where PEO nucleation occurred first. Moreover, after melting the sample to remove solvent–polymer interaction effects, PCL was first to crystallize from the melt, as has been previously reported. Differences in the films’ morphologies based on crystallization order were observed using polarized optical microscopy. These results demonstrate that the order of crystallization and the assembly within the film were controllable when casting symmetric diblock PEO-b-PCL films from different solvents.

Publisher URL: http://dx.doi.org/10.1021/acs.macromol.7b02004

DOI: 10.1021/acs.macromol.7b02004

You might also like
Discover & Discuss Important Research

Keeping up-to-date with research can feel impossible, with papers being published faster than you'll ever be able to read them. That's where Researcher comes in: we're simplifying discovery and making important discussions happen. With over 19,000 sources, including peer-reviewed journals, preprints, blogs, universities, podcasts and Live events across 10 research areas, you'll never miss what's important to you. It's like social media, but better. Oh, and we should mention - it's free.

  • Download from Google Play
  • Download from App Store
  • Download from AppInChina

Researcher displays publicly available abstracts and doesn’t host any full article content. If the content is open access, we will direct clicks from the abstracts to the publisher website and display the PDF copy on our platform. Clicks to view the full text will be directed to the publisher website, where only users with subscriptions or access through their institution are able to view the full article.