3 years ago

Rigid, bio-based polyamides from galactaric acid derivatives with elevated glass transition temperatures and their characterization

Rigid, bio-based polyamides from galactaric acid derivatives with elevated glass transition temperatures and their characterization
A comparative study was prepared investigating the synthesis of polyamides using bio-based building blocks derived from sugar beet pulp, namely 2,3:4,5-di-O-methylene-galactarate (GalXH) and 2,3:4,5-di-O-isopropylidene-galactarate (GalXMe) derivatives. Two different approaches towards the synthesis of bio-based polyamides were evaluated: melt polycondensation and direct polycondensation in solution via the phosphorylation technique. The polymerization of GalXMe with diamines resulted in polymers with narrow dispersity whereas GalXH gives polyamides with broad dispersity. Kinetic studies were performed to understand the different behavior of GalXH and GalXMe during polycondensation. The GalX monomers were combined with linear, cycloaliphatic and aromatic diamines, which resulted in amorphous polyamides with glass transition temperatures between 50 °C–220 °C. The obtained polyamides were stable at elevated temperatures (i.e. above 300 °C). The hydrolytic stability of the acetal/ketal groups in the GalX polyamides in different acids (e.g. 5% citric acid, 90% formic acid) was investigated and revealed higher acid resistance of GalXH compared to that of GalXMe. Furthermore, the water absorption of the GalX copolymers was compared to commercial polyamide references.

Publisher URL: www.sciencedirect.com/science

DOI: S0032386117307449

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.