Ionic Liquid Platform for Spinning Composite Chitin–Poly(lactic
acid) Fibers
Version 2 2018-06-22, 17:48
Version 1 2018-06-22, 16:30
Posted on 2018-06-22 - 17:48
In
the design of stronger chitin fibers reinforced with poly(lactic
acid) (PLA), an ionic-liquid-based (IL-based) approach was developed
in which both polymers were codissolved in an 1-ethyl-3-methylimidazolium
acetate ([C2mim][OAc]) and wet-jet spun into composite
fibers. Chitin, directly extracted from shrimp shell, had a solubility
in the IL of 2.75 wt %, while PLA of MW 700 000 g/mol had a
solubility of 49 wt %. Keeping the IL saturated in chitin, homogeneous
solutions of chitin and PLA could be obtained up to 27 wt % (relative
to the IL) PLA. Spinning dopes were prepared by maintaining the chitin
concentration relative to the IL at 1.75 wt % and adding PLA in chitin
to PLA weight ratios of 1:0.1 through 1:1 (PLA concentrations of 0.175–1.75
wt % relative to the IL). Homogeneous chitin/PLA fibers could be spun
when the chitin to PLA ratio was between 1:0.1 and 1:0.3. The tensile
strength and plasticity of the fibers depended on the chitin to PLA
ratio with the highest plasticity (8.8% vs 3.0% for pure chitin fibers),
strength (112 vs 71 MPa), and stiffness (5.9 vs 4.2 GPa) observed
for fibers with a chitin to PLA ratio of 1:0.3. Studies of the fracturing
surface of the fibers indicated that fracturing occurred through an
initial disruption of the interactions between polymer chains, followed
by complete fiber breakage. The work not only demonstrates that homogeneous
composite fibers can be spun using a biopolymer and PLA additive,
but also suggests a versatile platform for preparation of multiple
biopolymer–PLA materials using solution processing methods.
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Shamshina, Julia
L.; Zavgorodnya, Oleksandra; Berton, Paula; Chhotaray, Pratap K.; Choudhary, Hemant; Rogers, Robin D. (2018). Ionic Liquid Platform for Spinning Composite Chitin–Poly(lactic
acid) Fibers. ACS Publications. Collection. https://doi.org/10.1021/acssuschemeng.8b01554
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AUTHORS (6)
JS
Julia
L. Shamshina
OZ
Oleksandra Zavgorodnya
PB
Paula Berton
PC
Pratap K. Chhotaray
HC
Hemant Choudhary
RR
Robin D. Rogers