期刊
ANNUAL REVIEW OF CHEMICAL AND BIOMOLECULAR ENGINEERING, VOL 4
卷 4, 期 -, 页码 143-+出版社
ANNUAL REVIEWS
DOI: 10.1146/annurev-chembioeng-061312-103323
关键词
poly(lactic acid); poly(hydroxyalkanoate); morphology; structure; plasticizer; degradation
资金
- Div Of Civil, Mechanical, & Manufact Inn
- Directorate For Engineering [0900325] Funding Source: National Science Foundation
Environmental concerns have led to the development of biorenewable polymers with the ambition to utilize them at an industrial scale. Poly(lactic acid) and poly(hydroxyalkanoates) are semicrystalline, biorenewable polymers that have been identified as the most promising alternatives to conventional plastics. However, both are inherently susceptible to brittleness and degradation during thermal processing; we discuss several approaches to overcome these problems to create a balance between durability and biodegradability. For example, copolymers and blends can increase ductility and the thermal-processing window. Furthermore, chain modifications (e. g., branching/crosslinking), processing techniques (fiber drawing/annealing), or additives (plasticizers/nucleating agents) can improve mechanical properties and prevent thermal degradation during processing. Finally, we examine the impacts of morphology on end-of-life degradation to complete the picture for the most common renewable polymers.
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