Advantages And Disadvantages Of PLA

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Despite several advantages ,PLA has some drawbacks as well, which limits its use in certain applications3. PLA has poor toughness (very brittle material with less than 10% elongation at break), slow degradation rate (low crystallinity), hydrophobicity (hydrophobic with a static contact angle of approximately 80°), lack of reactive side chain groups and poor barrier properties (to moisture and air)3. Moreover, the poor melt strength restricts the applicability of specific processing techniques such as film blowing etc.
Several attempts have been made to improve the properties of PLA. Researchers have approached surface modifications to enhance the mechanical properties, especially toughness, processability, degradation behaviour and crystallization11. By the use of surface modification techniques different reactive groups such as –COOH, -OH, and –NH2 can be introduced on the surface of PLA. Grafting technique was utilized by Spinella et al.12, to improve the mechanical and barrier properties of the nanocomposites. PLLA based nanocomposites with PMMA modified CNCs showed higher storage modulus
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Thereafter, numerous investigations have been carried out in this area. In the homogenization, the suspension of cellulose fibre is pumped at high pressure and passed through a thin slit, where it is subjected to high shear forces. This combination of forces results in a high degree of fibrillation of the cellulose fibres. The high-pressure homogenization process is depicted in Figure 6. Advantages of high-pressure homogenization lies in easy scale-up and continuous operation. Despite these advantages, it has drawback as well, viz. clogging of the homogenizer due to larger fibers and the high number of passes needed to obtain
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