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Effect of α‐, β‐ and γ‐Cyclodextrins on the Inverse Temperature Transition of the Bioelastic Thermo‐Responsive Polymer Poly(VPGVG)
Author(s) -
Alonso Matiloe,
Arranz David,
Reboto Virginia,
RodríguezCabello José C.
Publication year - 2001
Publication title -
macromolecular chemistry and physics
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.57
H-Index - 112
eISSN - 1521-3935
pISSN - 1022-1352
DOI - 10.1002/1521-3935(20011001)202:15<3027::aid-macp3027>3.0.co;2-b
Subject(s) - polymer , chemistry , inverse temperature , solubility , polymer chemistry , cyclodextrin , thermodynamics , organic chemistry , physics
The influence of α‐, β‐ and γ‐cyclodextrins (CDs) on water solutions of the elastin‐like thermo‐responsive poly(VPGVG) has been studied in this work. All the three CDs were able to increase the temperature at which the inverse temperature transition of this polymer takes place ( T t ). This shift was dose‐dependent and β‐CD showed the highest power to shift T t , being γ‐cyclodextrin the weaker. However, the low solubility of β‐CD limited the maximum T t shift achieved and, for this reason, the maximum shift in T t was obtained by α‐CD. The results showed in this work has been tentatively explained by the formation of inclusion compounds between the apolar side chain of some of the amino acids present in the polymer and the corresponding CD as the cause behind the observed T t shifts. Furthermore, and as a peculiarity of special interest, the shift to higher values in T t caused by CDs was obtained without the typical reduction in the latent heat showed by other additions or chemical modifications of the polymer chain that also shift T t to higher values, as reported in the literature.