Effects of Processing Conditions and Plasticizing-Reinforcing Modification on the Crystallization and Physical Properties of PLA Films

The polylactic acid (PLA) resin Ingeo 4032D was selected as the research object. Epoxy soybean oil (ESO) and zeolite (3A molecular sieve) were used as plasticizer and reinforcing filler, respectively, for PLA blend modification. The mixture was granulated in an extruder and then blown to obtain film...

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Bibliographic Details
Published in:Membranes (Basel) 2021-08, Vol.11 (8), p.640
Main Authors: Wang, Shuo, Liu, Baodong, Qin, Yingying, Guo, Hongge
Format: Article
Language:English
Subjects:
Biodegradable materials
Cellulose
Crystallization
Dispersion
DSC analysis
Elongation
Granulation
Haze
Heat resistance
Impact strength
Mechanical properties
Microscopy
Molecular sieves
Optical properties
Physical properties
Plastics
Polylactic acid
polylactic acid blown film
Polymers
processing conditions
Solid phases
Soybean oil
Soybeans
Tensile strength
Thermodynamic properties
Vegetable oils
Zeolites
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Summary:The polylactic acid (PLA) resin Ingeo 4032D was selected as the research object. Epoxy soybean oil (ESO) and zeolite (3A molecular sieve) were used as plasticizer and reinforcing filler, respectively, for PLA blend modification. The mixture was granulated in an extruder and then blown to obtain films under different conditions to determine the optimum processing temperatures and screw rotation. Then, the thermal behaviour, crystallinity, optical transparency, micro phase structure and physical properties of the film were investigated. The results showed that with increasing zeolite content, the crystallization behaviour of PLA changed, and the haze of the film increased from 5% to 40% compared to the pure PLA film. Zeolite and ESO dispersed in the PLA matrix played a role in toughening and strengthening. The PLA/8 wt% zeolite/3 wt% ESO film had the highest longitudinal tensile strength at 77 MPa. The PLA/2 wt% zeolite/3 wt% ESO film had the highest longitudinal elongation at 13%. The physical properties depended heavily on the dispersion of zeolite and ESO in the matrix.
ISSN:2077-0375
2077-0375
DOI:10.3390/membranes11080640