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Solution and melt viscoelastic properties of controlled microstructure poly(lactide)
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10.1122/1.3609853
/content/sor/journal/jor2/55/5/10.1122/1.3609853
http://aip.metastore.ingenta.com/content/sor/journal/jor2/55/5/10.1122/1.3609853

Figures

Image of FIG. 1.
FIG. 1.

Dinuclear indium catalyst [(NNHO)InCl]2(μ-Cl)(μ-OEt) (1) for the living, enantioselective ROP of LA [Labourdette et al. (2009)].

Image of FIG. 2.
FIG. 2.

Formation of PLA samples with known L-LA:D-LA ratios.

Image of FIG. 3.
FIG. 3.

The intrinsic viscosities of PLAs studied versus molecular weight at 25 °C. The slope of the straight line is 0.75 (Mark Houwink slope) implying good-solvent conditions.

Image of FIG. 4.
FIG. 4.

Characteristic radius of R h (a) and R g (b) as a function of molecular weight.

Image of FIG. 5.
FIG. 5.

Master curve of the linear viscoelastic moduli, and and complex viscosity of L50D 22 at the reference temperature of 150 °C.

Image of FIG. 6.
FIG. 6.

The horizontal shift factors, a T for PLAs listed in Table I at the reference temperature of 150 °C. The dotted line represents single fitting of the data.

Image of FIG. 7.
FIG. 7.

(a) The storage modulus of L50D samples (b) the loss modulus of L50D samples at 150 °C.

Image of FIG. 8.
FIG. 8.

The scaling between the zero-shear viscosity and molecular weight of PLAs at the reference temperature of (a) 150 °C (b) 180 °C.

Image of FIG. 9.
FIG. 9.

The PM along with the relaxation spectrum of L50D 22 at 150 °C.

Image of FIG. 10.
FIG. 10.

Continuous relaxation spectra for L50D at 150 °C plotted with various molecular weights.

Image of FIG. 11.
FIG. 11.

Scaling between longest relaxation time and molecular weight of PLAs.

Image of FIG. 12.
FIG. 12.

Tensile stress growth coefficient as a function of time measured at various Hencky strain rates for L50D 22 at (a) 90 °C; (b) 110 °C; and (c) 130 °C.

Image of FIG. 13.
FIG. 13.

Step-strain relaxation tests performed at different strain values for L50D 22 at 150 °C.

Image of FIG. 14.
FIG. 14.

The damping functions of L50D 22 at 150 °C. Symbols are experimental data, whereas the dashed line represents the function form in Eq. (10).

Tables

Generic image for table
TABLE I.

PLA samples by ROP of LA catalyzed by 1.a

Generic image for table
TABLE II.

Generalized Maxwell model parameters (g i , λ i ) for sample L50D 22 at different temperatures.

Generic image for table
TABLE III.

The longest relaxation times for L50D 22 at various temperatures.

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/content/sor/journal/jor2/55/5/10.1122/1.3609853
2011-07-15
2014-04-21
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752b84549af89a08dbdd7fdb8b9568b5 journal.articlezxybnytfddd
Scitation: Solution and melt viscoelastic properties of controlled microstructure poly(lactide)
http://aip.metastore.ingenta.com/content/sor/journal/jor2/55/5/10.1122/1.3609853
10.1122/1.3609853
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