Thermoplastic blends of chitosan: A method for the preparation of high thermally stable blends with polyesters

Autor(es)

Grande, Rafael ^[1] ; Pessan, Luiz Antonio ^[2] ; Carvalho, Antonio J. F. ^[1]

Afiliação do(s) autor(es)

^[1] Univ Sao Paulo, Sao Carlos Sch Engn, Dept Mat Engn, Ave Joao Dagnone 1100, BR-13563120 Sao Carlos, SP - Brazil

^[2] Univ Fed Sao Carlos, Dept Mat Engn, Sao Carlos, SP - Brazil

• Tipo de documento: Artigo Científico
• Fonte: Carbohydrate Polymers; v. 191, p. 44-52, JUL 1 2018.
• Citações Web of Science: 2

Resumo

Chitosan is high potential material for new applications due to its properties, especially its antimicrobial activity, and because it is one of the most abundant natural polymers. However, chitosan can be processed only from solution limiting its applications. Methods for processing chitosan in molten have been a subject of recent interest. One method, involves thermoplastic its blends with poly(vinyl alcohol), however these blends undergo degradation due to acid residues from previous processing steps. Here we described a process to produce thermoplastic blends of poly(vinyl alcohol)-chitosan in a poly(lactic acid) matrix by avoiding degradation even at higher chitosan contents. The process involves the use of spray-and freeze-drying techniques to produce acid free blends of PVA/chitosan, then incorporated in PLA matrix by extrusion. These findings are expected to contribute to increasing and extending the applications of polysaccharides, such as chitosan, in new applications such as textiles, medical and food packing. (AU)

• Processo FAPESP: 15/07744-0 - Novo processo para preparação de blendas termoplásticas envolvendo polímeros de elevada polaridade
• Beneficiário: Rafael Grande
• Modalidade de apoio: Bolsas no Brasil - Pós-Doutorado