title: Crystallinity as a tunable switch of poly(L-lactide) shape memory effects.
abstract: 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 10MPa for the sample annealed 60min 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.
authors.affiliation: Centre of Polymer and Carbon Materials, Polish Academy of Sciences, 34, M. Curie-Skłodowska St., 41-819 Zabrze, Poland. Electronic address: michal.sobota@cmpw-pan.edu.pl.
authors.forename: Michał
authors.initials: M
authors.lastname: Sobota
authors.affiliation: Institute for Engineering of Polymer Materials and Dyes, Paint and Plastics Department in Gliwice, 50A Chorzowska St., 44-100 Gliwice, Poland.
authors.forename: Sebastian
authors.initials: S
authors.lastname: Jurczyk
authors.affiliation: Centre of Polymer and Carbon Materials, Polish Academy of Sciences, 34, M. Curie-Skłodowska St., 41-819 Zabrze, Poland.
authors.forename: Michał
authors.initials: M
authors.lastname: Kwiecień
authors.affiliation: Centre of Polymer and Carbon Materials, Polish Academy of Sciences, 34, M. Curie-Skłodowska St., 41-819 Zabrze, Poland.
authors.forename: Anna
authors.initials: A
authors.lastname: Smola-Dmochowska
authors.affiliation: Centre of Polymer and Carbon Materials, Polish Academy of Sciences, 34, M. Curie-Skłodowska St., 41-819 Zabrze, Poland.
authors.forename: Marta
authors.initials: M
authors.lastname: Musioł
authors.affiliation: Centre of Polymer and Carbon Materials, Polish Academy of Sciences, 34, M. Curie-Skłodowska St., 41-819 Zabrze, Poland.
authors.forename: Marian
authors.initials: M
authors.lastname: Domański
authors.affiliation: Centre of Polymer and Carbon Materials, Polish Academy of Sciences, 34, M. Curie-Skłodowska St., 41-819 Zabrze, Poland.
authors.forename: Henryk
authors.initials: H
authors.lastname: Janeczek
authors.affiliation: Centre of Polymer and Carbon Materials, Polish Academy of Sciences, 34, M. Curie-Skłodowska St., 41-819 Zabrze, Poland.
authors.forename: Michał
authors.initials: M
authors.lastname: Kawalec
authors.affiliation: Centre of Polymer and Carbon Materials, Polish Academy of Sciences, 34, M. Curie-Skłodowska St., 41-819 Zabrze, Poland.
authors.forename: Piotr
authors.initials: P
authors.lastname: Kurcok
mesh_terms: D001672:Biocompatible Materials / Q000737:chemistry*; D003460:Crystallization; D008422:Materials Testing; D011091:Polyesters / Q000737:chemistry*; D011108:Polymers; D015607:Stents
chemical_list: D001672:Biocompatible Materials; D011091:Polyesters; D011108:Polymers; C033616:poly(lactide)
keywords: Biodegradable polymers; Poly(L-lactide); Polyester; Smart polymers