Influence of Biodegradable Poly(butylene carbonate) on Plasticized Polylactide Blown Films

Abstract

The polylactide (PLA) was blended with poly(1,2-propylene glycol adipate) (PPA) and poly(butylene carbonate) (PBC). Then the extruded PLA/PPA/PBC blends were processed in the form of blown films. All of the ingredients used in the films are biodegradable. The miscibility, fracture surface morphology, and rheological properties of the PLA/PPA/PBC blends, further thermal properties, the tear-fracture surface morphology, crystalline morphology, and mechanical and optical properties of the blown films were investigated. PPA did not enhance the miscibility between PLA and PBC. From SEM micrographs of the cryogenically fracture surfaces, PBC particles evenly dispersed in the PLA matrix. It could increase the nucleating density of the spherulites and decrease the size of the spherulites of PLA. The results indicated that the 85.5/9.5/5 PLA/PPA/PBC film had excellent tensile strength, elongation at break, tear strength, and transmittancy. The shear yielding induced by cavitation of PBC particles was the major tearing mechanism during the film tear test. The enzymatic degradation of PLA was slightly retarded in the presence of both PPA and PBC. These findings contribute new knowledge to the additives area and give important implications for manufacturing biodegradable polymer packaging materials. C

The effectiveness of fiber-reinforced natural composites compared to the elastomer materials produced from nonrenewable resources in vibration transmission suppression

“…There were many attempts to improve its properties to be more competitive with more flexible polymers (polyethylene or polyethylene terephthalate) by blending with biodegradable polymers or copolymerization with other polyesters. [25][26][27][28][29] One of the economically viable options is adding plasticizer which can greatly improve the mechanical properties of the end material and provide a time stable biodegradable blend that can later be used to produce other composites with properties tailored for specific application. 27 Furthermore, with increased environmental consciousness of the society and with the reducing feedstock of nonrenewable resources, it has come for natural biodegradable composites to broaden their application range, including vibration dampening.…”

The vibroisolation effectiveness of fiber reinforced natural composites compared to the elastomer materials produced from non-renewable resources

“…It is a brittle (by comparison) and stiff material with typical elongation at break of 5%. There were many attempts to improve its properties to be more competitive with more flexible polymers (polyethylene or polyethylene terephthalate) by blending with biodegradable polymers or copolymerization with other polyesters [25][26][27][28][29][30]. One of the economically viable option is adding plasticizer which can greatly improve the mechanical properties of the end material and provides a time stable biodegradable blend that can later be used to produce other composites with properties tailored for specific application [27].…”

Performance and crystallization kinetics of poly (L‐lactic acid) toughened by poly (D‐lactic acid)

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