Abstract
Poly lactic acid (PLLA) is a promising biopolymer, obtained from polymerization of lactic acid that is derived from renewable resources through fermentation. The characteristic brittleness of PLLA is attributed to slow crystallization rates, which results in the formation of the large spherulites. Its glass temperature is relative high, above room temperature and close to 60 oC, and therefore its applications are limited. The additives poly((R)-3-hydroxybutyrate) (PHB), poly(vinyl acetate) (PVAc) and tributyl citrate (TBC) were used as compatibilizers in the biodegradable polymer blend of (PLLA/PPC). Results from DSC and POM analysis indicated that the blends of PLLA and PPC are immiscible. However, the blends with additives are miscible. TBC as plasticizer was added to PLLA to reduce its Tg. PVAc was used as compatibilizer to improve the miscibility between PLLA and PPC. FT-IR showed about 7 cm-1 shift in the C=O peak in miscible blends due to physical interactions. POM experiments together with the results of DSC and WAXD showed that PHB enhances the crystallization behavior of PLLA by acting as bio nuclei and the crystallization process can occur more quickly. Consequently an increase was observed in the peak intensity in WAXD.
Highlights
In recent years, interest has grown in biodegradable 40 °C
If plasticizer-polymers are compatible, all materials will form a homogeneous blend during processing
It is generally necessary that the tributyl citrate (TBC) as plasticizer and polymers have approximately the same polarity
Summary
Interest has grown in biodegradable 40 °C. PPC has low cost and good mechanical properties.polymers derived from renewable resources, such as It can be degraded to H O and CO through degraded in cellulose and its derivatives, and renewable aliphatic soil-burial or in a buffer solution[4]. Interest has grown in biodegradable 40 °C. PPC has low cost and good mechanical properties. PPC is an amorphous polyesters like PHB and PLLA, due to high oil prices, polymer that can be used as a toughening agent. To solve as well as the decreasing reserves of crude oil. A the problem of brittleness of PLLA, physical blending. E considerable portion of the petrochemical materials is most widely used in the industry. The development of (10% of crude oil) are used in the manufacture of polymer blends has increased in recent years because plastics such polypropylene, polyethylene, polystyrene, the market needs more plastic materials. All of these plastic are defined as a mixture of two or more polymers and
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