Thermograms obtained by DSC showing the glass transitions (Tg) of polymers and crystallization (Tc) and melting peak (Tm) in PLLA.
Tensile stress-strain curves of PLLA, PLGA, PDLLA, and PLCL at T = 23 °C. The inset (see the lupe) in a zoom of the main figure to show in detail the stress-strain curves for PLLA, PLGA, and PDLLA.
Frequency (ΔF) and dissipation (ΔD) response of SbpA adsorption on PLLA (black), PDLLA (red), PLGA (green), and PLCL (blue) at 23 °C. The numbered windows (1–4) refer to the different effects observed in dissipation during S-layer formation.
Dissipation vs. frequency curves for S-layer recrystallization on PLLA (black), PDLLA (red), PLGA (green), and PLCL (blue). The numbers indicate the three different processes observed in S-layer formation. The maximum in dissipation reaches within 30 s (t1) while the minimum occurs 1 h (t2) after SbpA injection.
AFM height images of SbpA recrystallized on (a) PLLA, (b) PDLLA, (c) PLGA, (d) PLCL after 12 h of protein incubation and at room temperature. The black shapes delimit the protein domains of size, 0.011 μm2 for PLLA, 0.034 μm2 for PDLLA, 0.036 μm2 for PLGA, and 0.09 μm2 for PLCL and also show the differences in protein orientation. The bottom right insets are the FFT images which reveal the periodicity of the S-layer. The lattice parameters calculated from FFT demonstrate S-layer has square lattice symmetry (p4) in those biopolymers (see Table IV for details).
Characteristics of the biopolymers used as substrates.
Mechanical properties of PLLA, PDLLA, PLGA, and PLCL.
Domain size and roughness of S-layers obtained by AFM. Mass adsorption, dissipation, and initial adsorption rate calculated from QCM-D curves.
Roughness (Rq) and lattice parameters (a, b, and γ) of recrystallized SbpA on PLLA, PDLLA, PLGA, and PLCL calculated from AFM height images.
PLLA, PDLLA, PLGA, and PLCL films properties; glass transition temperature (Tg), contact angle (ø), and roughness (Rq). The roughness was calculated from AFM height images.
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