XPTSeb (PTSub) [mol %] WPTSeb (PTSub) [wt.%] Tg [°C] E [Mpa] σb [Mpa] εb [%] PTF - - 58 2460 ± 376 79,10 ± 3,10 2,99 ± 0,17 PTF-PTSeb 95/5 5 6.1 46 290 ± 64 12,30 ± 0,23 247,02 ± 32,65 PTF-PTSeb 85/15 15 17.9 28 574 ± 79 17,15 ± 0,88 410,09 ± 18,27 PTF-PTSeb 75/25 25 29.16 12 2534 ± 176 76,49 ± 2,05 3,04 ± 0,27 PTF-PTSub 95/5 5 5.4 48 4113 ± 289 73,69 ± 3,70 2,39 ± 0,18 PTF-PTSub 85/15 15 15.9 31 2312 ± 52 16,71 ± 0,99 309,93 ± 50,80 PTF-PTSub 75/25 25 27.0 15 213 ± 82 70,61 ± 19,86 665,41 ± 46,08 SHAPE MEMORY BEHAVIOR OF FULLY BIO-BASED AROMATIC-ALIPHATIC COPOLYESTERS Agata ZUBKIEWICZa, Anna SZYMCZYKa, Sandra PASZKIEWICZb, Izabela IRSKAb [a] Department of Technical Physics, West Pomeranian University of Technology, Piastów Av. 48, 70311 Szczecin, Poland [b] Department of Materials Technology, West Pomeranian University of Technology, Piastów Av. 48, 70311 Szczecin, Poland Introduction Over the last decade, development of bio-based polymers has become one of the principal focuses of research in materials science, which is related to environmental awareness over gradual exhaustion of non-renewable resources. 2,5-furandicarboxylic acid (FDCA) stands out as a highly potential bio-based monomer able to replace petro-derived terephthalic acid.[1] FDCA and its derivatives can be used, among others, to obtain copolymers with interesting properties, such as shape memory effect. Shape-memory polymers as stimuli-responsive shape-changing polymers are of great interest for fundamental research and technological innovation. It is known that shape memory materials display the ability of changing their shape in response to external stimuli, such as changes in temperature.[2] In the present study poly(trimetylene 2,5-furanoate-co-trimethylene sebacate) copolymers (PTF-co-PTSeb) and poly(trimetylene 2,5-furanoate-co trimethylene suberate) copolymers (PTF-co-PTSub) containing from 5 to 25 mol % of trimethylene sebacate unis (TSeb), or trimethylene suberate units (TSub) were synthesized by a two-stage melt polycondensation process using dimethyl esters of 2,5-furandicarboxylic acid (DMFDCA), bio-1,3-propanediol (1,3-PD) and dimethyl sebacate (DMSeb) or dimethyl suberate (DMSub), depending on the copolymer. Fig. 3 a) Shape memory cycles of PTF-co-PTSeb 85/15 b) Shape fixity and shape recovery changes vs. cycle number Fig. 4 a) Shape memory cycles of PTF-co-PTSub 75/25 copolymer b) Shape fixity and shape recovery changes vs. cycle number 80% 81% 82% 83% 97% 98% 99% 100% 0 5 Shape fixity Shape recovery Cycle number 91% 92% 92% 93% 93% 94% 94% 95% 95% 94% 95% 96% 97% 98% 99% 100% 0 2 4 6 8 Shape fixity Shape recovery Ccle number Table 1. Characteristic of PTF-co-PTSeb and PTF-co-PTSub copolymers Fig. 2 Demonstration of shape recovery of sample (dumbbell) of PTF-co- PTSeb 85/15 copolymer at temperature above Tg. Conclusions The obtained copolymers were studied concerning their thermal properties and mechanical performance. By increasing the PTSeb or PTSub segment contents, the PTF-co-PTSeb(PTSub) copolymers show lower glass transition temperatures. One can also find that the mechanical properties are closely related to the ratio of PTF to PTSeb(PTSub) content in the copolymer. Additionally, the thermally induced shape memory effect was investigated, using DMTA analysis. In the case of shape-memory polymers (SMPs), the recovery time to original shape after regeneration depends on the temperature. It is known that SMPs at temperatures higher than Tg become rubbery and have a low Young's modulus and high formability. In this region, the shape of the SMP can be modified, and the modified shape can be kept if the temperature drops below the Tg. If the SMP is reheated above the Tg, the transition into the rubbery regime causes the SMP to regain its original shape. The PTF-co-PTSeb 85/15 and PTF-co-PTSub 75/25 copolymers showed satisfactory shape-fixity of over 91% and 80% , respectively, and shape recovery efficiency of over 95% and 98%, respectively. The