Back to Search
Start Over
Fabrication and characterization of novel starch-grafted poly l-lactic acid/montmorillonite organoclay nanocomposites.
- Source :
-
Carbohydrate Polymers . Feb2016, Vol. 137, p111-118. 8p. - Publication Year :
- 2016
-
Abstract
- In this work, poly( l -lactic acid)- g -starch layered silicate nanocomposites (NCs) (PLLA- g -starch/MMT) were fabricated by intercalative bulk graft copolymerization of LA with starch, in the presence of either stannous octoate acting as a catalyst or LA-MMT organoclay acting as a cocatalyst-nanofiller. This procedure was performed inside a custom vacuum micro-reactor. To better understand the graft copolymerization mechanism, in situ processing types, interfacial interactions and nanostructure formation of PLLA- g -starch/MMT NCs, methods such as FT-IR, XRD, 1 H NMR, 13 C CP/MAS-NMR, DSC/TGA, TEM and SEM were utilized. The morphology and thermal behaviors of nanocomposites were found to be strongly dependent on the loading mass fraction of LA-MMT within the nanocomposite structure and the type of in situ processing such as interfacial, physical and chemical interactions. Preintercalated LA-MMT organoclay exhibited dual functions. It demonstrated the ability to act as a catalyst, essentially accelerating in situ graft copolymerization via esterification of LA carboxyl groups with hydroxyl groups of starch macromolecules, whilst also acting as a nananofiller-compatibilizer. [ABSTRACT FROM AUTHOR]
- Subjects :
- *STARCH
*NANOCOMPOSITE materials
*ORGANOCLAY
*MONTMORILLONITE
*COPOLYMERIZATION
Subjects
Details
- Language :
- English
- ISSN :
- 01448617
- Volume :
- 137
- Database :
- Academic Search Index
- Journal :
- Carbohydrate Polymers
- Publication Type :
- Academic Journal
- Accession number :
- 111566598
- Full Text :
- https://doi.org/10.1016/j.carbpol.2015.10.043