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Tuning the processability, morphology and biodegradability of clay incorporated PLA/LLDPE blends via selective localization of nanoclay induced by melt mixing sequence
- Source :
- eXPRESS Polymer Letters, Vol 7, Iss 1, Pp 21-39 (2013)
- Publication Year :
- 2013
- Publisher :
- Department of Polymer Engineering, Scientific Society of Mechanical Engineering, 2013.
-
Abstract
- Polylactic acid (PLA)/linear low density polyethylene (LLDPE) blend nanocomposites based on two different commercial-grade nanoclays, Cloisite® 30B and Cloisite® 15A, were produced via different melt mixing procedures in a counter-rotating twin screw extruder. The effects of mixing sequence and clay type on morphological and rheological behaviors as well as degradation properties of the blends were investigated. The X-ray diffraction (XRD) results showed that generally the level of exfoliation in 30B based nanocomposites was better than 15A based nanocomposites. In addition, due to difference in hydrophilicity and kind of modifiers in these two clays, the effect of 30B on refinement of dispersed phase and enhancement of biodegradability of PLA/LLDPE blend was much more remarkable than that of 15A nanoclay. Unlike the one step mixing process, preparation of nanocomposites via a two steps mixing process improved the morphology. Based on the XRD and TEM (transmission electron microscopic) results, it is found that the mixing sequence has a remarkable influence on dispersion and localization of the major part of 30B nanoclay in the PLA matrix. Owing to the induced selective localization of nanoclays in PLA phase, the nanocomposites prepared through a two steps mixing sequence exhibited extraordinary biodegradability, refiner morphology and better melt elasticity.
- Subjects :
- Nanocomposite
Melt mixing
Materials science
Polymers and Plastics
General Chemical Engineering
Organic Chemistry
Mixing methods
Twin screw extruder
One-Step
Biodegradation
lcsh:Chemical technology
Biodegradable polymers
Polylactic acid
Nanocomposites
Linear low-density polyethylene
chemistry.chemical_compound
chemistry
Rheology
lcsh:TA401-492
Materials Chemistry
lcsh:Materials of engineering and construction. Mechanics of materials
lcsh:TP1-1185
Physical and Theoretical Chemistry
Composite material
Subjects
Details
- ISSN :
- 1788618X
- Volume :
- 7
- Database :
- OpenAIRE
- Journal :
- Express Polymer Letters
- Accession number :
- edsair.doi.dedup.....ebfb736c80ea052f177bf93ffbad838a