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Titolo:
Photoacoustic monitoring of internal plastification in poly(3-hydroxybutyrate-co-3-hydroxyvalerate) copolymers: Measurements of thermal parameters
Autore:
Sanchez, RR; Rieumont, JB; Cardoso, SL; da Silva, MG; Sthel, MS; Massunaga, MSO; Gatts, CN; Vargas, H;
Indirizzi:
Univ-28015620 Norte Fluminense, Ctr Ciencia & Tecnol, Lab Mat Avancados, BR Univ Estadual Norte Fluminense Campos Goytacazes RJ Brazil BR-28015620 BC Univ-28015620 Norte Fluminense, Ctr Ciencia & Tecnol, Lab Ciencias Quim, BR Univ Estadual Norte Fluminense Campos Goytacazes RJ Brazil BR-28015620 BC Univ28015620l Norte Fluminense, Ctr Ciencia & Tecnol, Lab Ciencias Fis, BR- Univ Estadual Norte Fluminense Campos Goytacazes RJ Brazil BR-28015620 BC
Titolo Testata:
JOURNAL OF THE BRAZILIAN CHEMICAL SOCIETY
fascicolo: 2, volume: 10, anno: 1999,
pagine: 97 - 103
SICI:
0103-5053(199903/04)10:2<97:PMOIPI>2.0.ZU;2-N
Fonte:
ISI
Lingua:
ENG
Soggetto:
DEPTH-PROFILE; DIFFUSIVITY;
Keywords:
photoacoustic spectroscopy; thermophysical parameters; poly(hydroxyalkanoates); poly(3-hydroxybutyrate-co-3-hydroxyvalerate);
Tipo documento:
Article
Natura:
Periodico
Settore Disciplinare:
Physical, Chemical & Earth Sciences
Citazioni:
22
Recensione:
Indirizzi per estratti:
Indirizzo: Sanchez, RR Univ Estadual Norte Fluminense, Ctr Ciencia & Tecnol, Lab Mat Avancados, Av Univ Estadual Norte Fluminense Av Alberto Lamego 2000 Campos Goytacazes RJ Brazil BR-28015620 BC
Citazione:
R.R. Sanchez et al., "Photoacoustic monitoring of internal plastification in poly(3-hydroxybutyrate-co-3-hydroxyvalerate) copolymers: Measurements of thermal parameters", J BRAZ CHEM, 10(2), 1999, pp. 97-103

Abstract

Basic data on thermophysical properties of poly(3-hydroxybutyrate-co-3-hydroxyvalerate) copolymers poly(3HB-co-3HV) were investigated with the aim ofunderstanding the role of 3-hydroxyvalerate monomeric units (3HV) incorporated during random copolymerization. The results show strong evidence that internal plastification is produced by the introduction of 3HV units in thecopolymer. It was observed that copolymer thermal conductivity increased approximately linearly with the 3HV content. On the other hand, thermal diffusivity was very sensitive to the change in the copolymer composition showing a sudden rise that attained a saturation plateau. Amplitude-frequency plots indicate that a thermoelastic bending mechanism is operating. In this paper a new photoacoustic arrangement for the measurement of thermal effusivity is presented.

ASDD Area Sistemi Dipartimentali e Documentali, Università di Bologna, Catalogo delle riviste ed altri periodici
Documento generato il 07/07/20 alle ore 20:15:28