Hostname: page-component-54dcc4c588-tfzs5 Total loading time: 0 Render date: 2025-09-21T14:30:20.095Z Has data issue: false hasContentIssue false
  • English
  • Français

Kinetics of crystallization of biodegradable PHA copolymers: acombined X-ray scattering and micro-indentation study

Published online by Cambridge University Press:  24 March 2011

Maraolina Domínguez-Díaz ,
Araceli Flores ,
Angel Romo-Uribe  and
Rodolfo Cruz-Silva
Maraolina Domínguez-Díaz
Affiliation:
Instituto de Ciencias Físicas, Universidad Nacional Autonoma de Mexico Av. Universidad s/n Col. Chamilpa, Cuernavaca Mor. 62210, MEXICO Centro de Investigación en Ingeniería y Ciencias Aplicadas, UAEM Av. Universidad s/n Col. Chamilpa, Cuernavaca Mor. 62210, MEXICO
Araceli Flores
Affiliation:
Instituto de Estructura de la Materia, C.S.I.C. Serrano 119, 28006 Madrid, SPAIN
Angel Romo-Uribe*
Affiliation:
Instituto de Ciencias Físicas, Universidad Nacional Autonoma de Mexico Av. Universidad s/n Col. Chamilpa, Cuernavaca Mor. 62210, MEXICO
Rodolfo Cruz-Silva
Affiliation:
Centro de Investigación en Ingeniería y Ciencias Aplicadas, UAEM Av. Universidad s/n Col. Chamilpa, Cuernavaca Mor. 62210, MEXICO
*
* To whom correspondence should be addressed: aromo-uribe@fis.unam.mx
Get access

Abstract

Wide Angle X-ray scattering (WAXS) and indentation hardness have been usedto study the development of crystallinity at room temperature ofbiodegradable poly(hydroxybutyrate) (PHB) and its copolymer withhydroxyvalerate (PHB/HV) containing 12% of valerate. Measurements werecarried out immediately after quenching the samples from the molten state(200 ºC) in ice water and over two weeks of storage at room temperature.WAXS showed that the crystallization of the PHB-based polymers initiatedwithin the first minutes of storage at room temperature, the copolymerdisplaying a higher rate of crystallization than the homopolymer. For allsamples, the degree of crystallinity, α, nearly reached aplateau value within the first hour of crystallization. Concurrently to thedevelopment of crystallinity, microhardness values, H,clearly rose as crystallization occurred. Monitoring the crystallization forover two weeks showed that after the rapid increase of αand H, there was a slow monotonic growth of theseproperties. A correlation between nanostructure and microhardness is foundat all stages of the crystallization process.

Keywords

x-ray diffraction (XRD)polymermicrostructure

Access options

Get access to the full version of this content by using one of the access options below. (Log in options will check for institutional or personal access. Content may require purchase if you do not have access.)

Article purchase

Temporarily unavailable

References

REFERENCES

1. Doi, Y., Kanesawa, Y. and Kunioka, M., Macromolecules 23, 26 (1990).Google Scholar
2. Madison, L.L. and Huisman, G.W., Microbiol Mol Biology Rev 63, 21 (1999).Google Scholar
3. Yokouchi, M., Chatani, Y., Tadokoro, H., Teranishi, K., and Tani, H., Polymer 14, 267 (1973).10.1016/0032-3861(73)90087-6Google Scholar
4. Seki, T. and Okahata, Y., Macromolecules 17, 1882 (1984).Google Scholar
5. Organ, S.J. and Barham, P., J. Materials Sci. 26, 1368 (1991)10.1007/BF00544479Google Scholar
6. Organ, S.J. and Barham, P., J. Materials Sci. 29, 1676 (1994)Google Scholar
7. Pearce, R.P. and Marchessault, R.H., Macromolecules 27, 3869 (1994)Google Scholar
8. Flores, A., Ania, F., and Baltá Calleja, F.J., Polymer 50, 729 (2009).10.1016/j.polymer.2008.11.037Google Scholar
9. Marchessault, R.H., Okamura, K. and Su, C.J., Macromolecules 3, 735 (1970).10.1021/ma60018a005Google Scholar