Crystallinity as a tunable switch of poly(L-lactide) shape memory effects
PBN-AR
Instytucja
Centrum Materiałów Polimerowych i Węglowych Polskiej Akademii Nauk
Informacje podstawowe
Główny język publikacji
angielski
Czasopismo
Journal of the Mechanical Behavior of Biomedical Materials (35pkt w roku publikacji)
ISSN
1751-6161
EISSN
Wydawca
Elsevier
DOI
Rok publikacji
2017
Numer zeszytu
Strony od-do
144–151
Numer tomu
66
Identyfikator DOI
Liczba arkuszy
Słowa kluczowe
angielski
Biodegradable polymers; Smart polymers; Poly(L-lactide); Polyester
Streszczenia
Język
angielski
Treść
Materials with shape memory effect (SME) have already been widely used in the medical field. The interesting part of this group is represented by double function materials. The bioresorption and SME ability are common in polyesters implants. The first information about vascular stent made of bioresorbable polyester with SME was published in 2000. However, there are not many investigations about SME control of elements in the aspect of material processing. In the present work, the ability to control the shape memory (SM) of bioresorbable and semicrystalline poly(L-lactide) (PLLA) is investigated. The studies are based on the unexpected effect of material orientation which was demonstrated even at low percentage deformation in crystallized mould injected material. The presented studies revealed that the different degrees of crystallinity obtained during processing might be a useful switch to create a tailored SME for a specific application. The prepared samples of variable morphology revealed a possibility to control the value of material stress during permanent shape recovery. The degree of shape recovery of the prepared samples was also controlable. The highest stress value observed during permanent shape recovery reached 10 MPa for the sample annealed 60 min at 115 °C even when the sample was only deformed in 8%. The other significant aspect of this work is to present the problem of slow crystallization of the material during and after processing (cooling rate) as well as the possibility of negative SME change during the shelf life of the fabric.
Inne
System-identifier
PX-58774b6e82ce01768f6bd619
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