On the effects of hydroxyl substitution degree and molecular weight on mechanical and water barrier properties of hydroxypropyl methylcellulose films

Autor(es)

Otoni, Caio G. ^{[1, 2]} ; Lorevice, Marcos V. ^{[1, 3]} ; de Moura, Marcia R. ^[4] ; Mattoso, Luiz H. C. ^[1]

Afiliação do(s) autor(es)

^[1] Embrapa Instrumentat, Nanotechnol Natl Lab Agr LNNA, Rua 15 Novembro 1452, BR-13560970 Sao Carlos, SP - Brazil

^[2] Univ Fed Sao Carlos, Dept Mat Engn, PPG CEM, Rodovia Washington Luis, Km 235, BR-13565905 Sao Carlos, SP - Brazil

^[3] Univ Fed Sao Carlos, Dept Chem, PPGQ, Rodovia Washington Luis, Km 235, BR-13565905 Sao Carlos, SP - Brazil

^[4] Sao Paulo State Univ, FEIS, Dept Phys & Chem, Av Brasil 56, BR-15385000 Ilha Solteira, SP - Brazil

• Tipo de documento: Artigo Científico
• Fonte: Carbohydrate Polymers; v. 185, p. 105-111, APR 1 2018.
• Citações Web of Science: 5

Resumo

In line with the increasing demand for sustainable packaging materials, this contribution aimed to investigate the film-forming properties of hydroxypropyl methylcellulose (HPMC) to correlate its chemical structure with film properties. The roles played by substitution degree (SD) and molecular weight (M-w) on the mechanical and water barrier properties of HPMC films were elucidated. Rheological, thermal, and structural experiments supported such correlations. SD was shown to markedly affect film affinity and barrier to moisture, glass transition, resistance, and extensibility, as hydroxyl substitution lessens the occurrence of polar groups. M-w affected mostly the rheological and mechanical properties of HPMC-based materials. Methocel (R) E4 M led to films featuring the greatest tensile strength (ca., 67 MPa), stiffness (ca., 1.8 GPa), and extensibility (ca., 17%) and the lowest permeability to water vapor (ca., 0.9 g mm kPa(-1) h(-1) m(-2)). These properties, which arise from its longer and less polar chains, are desirable for food packaging materials. (AU)

• Processo FAPESP: 13/14366-7 - Filmes comestíveis à base de polpas de frutas e hortaliças adicionados de biopolímeros e reforçados com fibras de celulose miniaturizadas
• Beneficiário: Caio Gomide Otoni
• Modalidade de apoio: Bolsas no Brasil - Mestrado
• Processo FAPESP: 14/23098-9 - Estudo e otimização de biocompósitos poliméricos comestíveis formulados com resíduos do processamento de frutas e hortaliças e reforçados com fibras vegetais
• Beneficiário: Caio Gomide Otoni
• Modalidade de apoio: Bolsas no Brasil - Doutorado Direto