Shape memory effects of poly(ethylene terephthalate-co-ethylene succinate) random copolymers

Tsai, Yuhsin; Tai, Chia hon; Tsai, Shih Jung; Tsai, Fuu Jen

doi:10.1016/j.eurpolymj.2007.11.019

Cited by 28 publications

(17 citation statements)

References 16 publications

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“…The DSC results indicated that PETG copolyesters with < 20 mol % 1,3/1,4-CHDM, such as PETG 10 , and PETG 20 , were crystallizable, while those with > 20 mol% 1,3/ 1,4-CHDM, such as PETG 30 , PETG 40 and PETG 50 , were amorphous. These results indicated that introducing 1,3/1,4-CHDM into the PET homopolymer markedly affected both the melting temperature and the crystallinity of the copolyesters.…”

Section: Thermal Propertiesmentioning

confidence: 96%

“…The details of the synthesis can be found elsewhere. [9][10][11] In each preparation, the reaction mixture comprised excess EG, various amounts of diol and diacid (molar ratio of diol/diacid 5 1.4), 350 ppm Ti(O(CH 2 ) 3 CH 3 ) 4 and 90 ppm Co(OAc) 2 by weight. The reaction mixture was heated to the final temperature (220-2508C) in an atmosphere of nitrogen, and was stirred at a constant speed (500 rpm).…”

Section: Synthesismentioning

confidence: 99%

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Amorphous copolyesters based on 1,3/1,4‐cyclohexanedimethanol: Synthesis, characterization and properties

Tsai

Fan

Hung

et al. 2008

J of Applied Polymer Sci

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Two series of amorphous copolyesters, PETGN and PETGS, were synthesized by the copolymerization of 2,6-naphthalene dicarboxylic acid (NDA) (0-40%), succinic acid (SA) (0-40%), 1,3/1,4-cyclohexanedimethanol (1,3/1,4-CHDM) (10-50%), ethylene glycol (EG), and terephthalic acid (TPA). The compositions and molecular weights of the copolyesters were determined by 1 H NMR spectroscopy and viscometry, respectively. The thermal behaviors were studied over the entire range of copolymer compositions, using DSC and TGA. The optical characteristics, heat-shrinkable effects and tensile properties of these polymers were also determined. Experimental results indicated that the thermal, optical, tensile, and shrinkage properties of PETGN and PETGS were functions of NDA or SA content. DSC and X-ray analysis demonstrated that both PETGN and PETGS series were amorphous. Incorporating NDA and SA influenced the T g values of those polymers, from about 378C for PETG 30 S 40 to 898C for PETG 30 N 40 . Furthermore, the shrinkage of these amorphous copolyesters was more than 40% when the heating temperature was higher than the corresponding T g .

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Section: Thermal Propertiesmentioning

confidence: 96%

Section: Synthesismentioning

confidence: 99%

Amorphous copolyesters based on 1,3/1,4‐cyclohexanedimethanol: Synthesis, characterization and properties

Tsai

Fan

Hung

et al. 2008

J of Applied Polymer Sci

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“…A sharp, intense tan δ max peak followed by a reduction in tan δ to values below 0.5 indicates that a SMP will behave in a manner similar to an elastomer and display a significant shape recovery when evaluated. In contrast, a low intensity tan δ max indicates that a lesser shape recovery will occur (Chun et al, 2002;Tsai et al, 2008). Hence, a narrow, intense tan δ peak indicates a fast transformation whereas a weak broad peak suggests that the transformation will be slower.…”

Section: Dynamic Mechanical Analysismentioning

confidence: 82%

“…The temperature at which the modulus dropped sharply marked the onset of the T gα transition, when large segments of the polymer chains gain sufficient thermal energy to begin moving, and established the starting point of the shape memory effect. Tsai et al (2008) suggested that a sharp, at least one order of magnitude, decrease in storage modulus provides convincing evidence that a polymer system will demonstrate shape memory capability (Du and Zhang, 2010). The temperature at which the tan δ max for a particular sample occurred (Fig.…”

Section: Dynamic Mechanical Analysismentioning

confidence: 96%

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The effect of organoclay addition on the properties of an acrylate based, thermally activated shape memory polymer

Barwood

Breen

Clegg

et al. 2014

Applied Clay Science

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Shape Memory Polymers (SMPs) exhibit the intriguing ability to change back from an intermediate, deformed shape back to their original, permanent shape. In this contribution a systematic series of t-butylacrylate-copoly(ethyleneglycol) dimethacrylate (tBA-co-PEGDMA) polymers have been synthesised and characterised prior to incorporation of organoclay. Increasing the poly(ethyleneglycol) dimethacrylate (PEGDMA) content in increments of 10% increased the storage modulus from 2005 to 2250 MPa, reduced the glass transition temperature from +41 to − 26°C and reduced the intensity of the associated tan δ peak. The tBA-co-PEGDMA crosslinked networks displayed useful shape memory properties up to PEGDMA contents of 40%. Above this PEGDMA percentage the materials were prone to fracture and too brittle for a realistic assessment of their shape memory capability. The system containing 90% t-butylacrylate (tBA) and 10% PEGDMA was selected as the host matrix to investigate how the incorporation of 1 to 5 mass% of a benzyl tallow dimethylammoniumexchanged bentonite (BTDB) influenced the shape memory properties. X-ray diffraction data confirmed that BTDB formed a microcomposite in the selected matrix and exerted no influence on the storage modulus, rubbery modulus, glass transition temperature, T g , or the shape or intensity of the tan δ peak of the host matrix. Therefore, it was anticipated that the presence of BTDB would have no effect, positive or negative, nor on the shape memory properties of the host matrix. However, it was found that the incorporation of clay, especially at the 1 mass% level, significantly accelerated the speed, compared with the clay-free SMP, at which the microcomposite returned to the original, permanent shape. This accelerated return to the permanent shape was also observed when the microcomposite was coated onto a 100 μm PET film.

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3D‐Printed Shape Memory Poly(alkylene terephthalate) Scaffolds as Cardiovascular Stents Revealing Enhanced Endothelialization

Van Daele,

Chausse,

Parmentier

et al. 2024

Adv Healthcare Materials

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Cardiovascular diseases are the leading cause of death and current treatments such as stents still suffer from disadvantages. Balloon expansion causes damage to the arterial wall and limited and delayed endothelialization gives rise to restenosis and thrombosis. New more performing materials that circumvent these disadvantages are required to improve the success rate of interventions. To this end, we investigated the use of a novel polymer, poly(hexamethylene terephthalate), for this application. We optimized the synthesis to obtain polymers with high molar masses up to 126.5 kg/mol and performed a thorough chemical and thermal analysis. We 3D‐printed the polymers into personalized cardiovascular stents using the state‐of‐the‐art solvent‐cast direct‐writing technique, established the potential of these stents to expand using their shape memory behavior and showed that the stents are more resistant to compression than the PLLA benchmark. Furthermore, we demonstrated the polymer's hydrolytic stability in an accelerated degradation study of six months. Finally, the stents were subjected to an in vitro biological evaluation, revealing that the polymer is non‐hemolytic and supports significant endothelialization after only 7 days, demonstrating the enormous potential of these polymers to serve cardiovascular applications.This article is protected by copyright. All rights reserved

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Shape memory effects of poly(ethylene terephthalate-co-ethylene succinate) random copolymers

Cited by 28 publications

References 16 publications

Amorphous copolyesters based on 1,3/1,4‐cyclohexanedimethanol: Synthesis, characterization and properties

Amorphous copolyesters based on 1,3/1,4‐cyclohexanedimethanol: Synthesis, characterization and properties

The effect of organoclay addition on the properties of an acrylate based, thermally activated shape memory polymer

3D‐Printed Shape Memory Poly(alkylene terephthalate) Scaffolds as Cardiovascular Stents Revealing Enhanced Endothelialization

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