Abstract
Shape memory polymers represent a class of polymers that can recover its original shape under stimulus. This paper presents the preliminary results of a broader research programme that investigates the potential use of polyethylene terephthalate glycol (PETG), a glycol modified version of polyethylene terephthalate (PET), for the fabrication of smart bone tissue engineering scaffolds. PETG. A full characterization analysis is carried out, including chemical analysis, mechanical analysis and shape recovery characteristics. Chemical analysis show the presence of terephthalic acid (TPA), ethylene glycol (EG) and cyclohexanedimethanol (CHDM) in the polymer structure. Mechanical analysis, considering a quasistatic tensile test, shows that PETG presents better than PET. Shape recovery is assessed using a cyclic thermomechanical experiment where stress and temperature are controlled during the programming and recovery phases and demonstrates that PETG is able to change and recover its initial shape.
Highlights
Smart or intelligent materials represent a special class of materials able to change some of their properties in response to changes in their environmental conditions [1]
This paper presents the preliminary results of a broader research programme that investigates the potential use of polyethylene terephthalate glycol (PETG), a glycol modified version of polyethylene terephthalate (PET), for the fabrication of smart bone tissue engineering scaffolds
Chemical analysis show the presence of terephthalic acid (TPA), ethylene glycol (EG) and cyclohexanedimethanol (CHDM) in the polymer structure
Summary
Smart or intelligent materials (e.g. shape memory alloys and polymers, electro-rheological fluids, piezoelectric materials) represent a special class of materials able to change some of their properties in response to changes in their environmental conditions [1]. External stimuli include changes in temperature, pressure, moisture, pH, electrical and magnetic fields or acoustic stimulation [2, 3]. Due to their potential sensing, actuation, self-cleaning, selfhealing, self-diagnosis and shock absorber properties they are promising materials for a wide range of applications such as construction, aerospace, robotics, biotechnology and tissue engineering [2, 4]. In the field of tissue engineering, smart materials present significant potential to design smart three-dimensional (3D) biocompatible and biodegradable porous scaffolds (support structures that provide a proper biomechanical environment for cell attachment, differentiation and proliferation, promoting the formation of a new tissue) providing a dynamic change during tissue regeneration and delivering specific stimulations to cells [5]. Preliminary results are presented in this paper, which investigates the chemical composition, mechanical properties and 4D behaviour of PETG
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