Effect of hot drawing on properties of wet-spun poly(L,D-lactide) copolymer multifilament fibers

Polylactide stereocopolymer multifilament fibers were prepared by wet spinning and subsequent hot drawing. The stereocopolymers were poly-(L,D-lactide) [P(L,D)LA], L/D ratio 96/4, and poly-(L,DL-lactide) [P(L,DL)LA], L/DL ratio 70/30. They were dissolved in dichloromethane and coagulated in a spin b...

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Bibliographic Details
Published in:Journal of applied polymer science 2010-01, Vol.115 (1), p.608-615
Main Authors: Rissanen, Marja, Puolakka, Arja, Hukka, Terttu, Ellä, Ville, Kellomäki, Minna, Nousiainen, Pertti
Format: Article
Language:English
Subjects:
Applied sciences
Biological and medical sciences
biopolymers
Copolymers
Crystal structure
crystallization
degradation
Ethyl alcohol
Exact sciences and technology
Fibers
Fibers and threads
Filaments
Forms of application and semi-finished materials
Hot drawing
mechanical properties
Medical sciences
Modulus of elasticity
Polymer industry, paints, wood
Surgery (general aspects). Transplantations, organ and tissue grafts. Graft diseases
Technology of polymers
Technology. Biomaterials. Equipments
Tensile strength
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Summary:Polylactide stereocopolymer multifilament fibers were prepared by wet spinning and subsequent hot drawing. The stereocopolymers were poly-(L,D-lactide) [P(L,D)LA], L/D ratio 96/4, and poly-(L,DL-lactide) [P(L,DL)LA], L/DL ratio 70/30. They were dissolved in dichloromethane and coagulated in a spin bath containing ethanol. The hot-drawing temperature was 65°C. The draw ratios (DR) were upto 4.5 to the P(L,D)LA 96/4 filaments and upto 3 to the P(L,DL)LA 70/30 filaments. Wet spinning decreased crystallinities of both copolymers. Hot drawing increased the crystallinity of the P(L,D)LA 96/4 filament but not to the level of the original copolymer, whereas the as-spun and the hot-drawn P(L,DL)LA 70/30 filaments were amorphous. The filament diameter, tenacity, Young's modulus, and elongation at break were dependent on the DR. The maximum tenacity (285 MPa) and Young's modulus (2.0 GPa) were achieved with the P(L,D)LA 96/4 filament at the DR of 4.5. Respectively, the maximum tenacity of the hot-drawn P(L,DL)LA 70/30 filament was 175 MPa and Young's modulus 1.3 GPa at the DR of 3. Hot drawing slowed down in vitro degradation rate of both stereocopolymer filaments.
ISSN:0021-8995
1097-4628
1097-4628
DOI:10.1002/app.31015