Shape Memory Systems with Biodegradable Polyesters

Kocsis, J. Karger; Siengchin, Suchart

doi:10.1002/9783527656950.ch6

Cited by 4 publications

(7 citation statements)

References 82 publications

(82 reference statements)

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“…27 Due to excellent physical properties and good biocompatibility, PLA has received increasing attention in the development of SMPs. 28 The crystalline domains in PLA act as net points, whereas molecules in the amorphous phase works as switching segments with the T trans slightly higher than T g . However, the permanent shape was only able to be recovered when the deformation ratio was low in the programming procedure.…”

Section: ■ Introductionmentioning

confidence: 99%

“…PLA is a semicrystalline thermoplastic material exhibiting T g and T m in the ranges of 60–70 °C and 150–170 °C, respectively . Due to excellent physical properties and good biocompatibility, PLA has received increasing attention in the development of SMPs . The crystalline domains in PLA act as net points, whereas molecules in the amorphous phase works as switching segments with the T trans slightly higher than T g .…”

Section: Introductionmentioning

confidence: 99%

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Control of PLA Stereoisomers-Based Polyurethane Elastomers as Highly Efficient Shape Memory Materials

Fan

Tan

Liu

et al. 2016

ACS Sustainable Chem. Eng.

105

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Poly(lactic acid) (PLA) has received increasing attention in the development of shape memory polymers (SMPs) due to its excellent physical properties and good biocompatibility. However, the intrinsically increased crystallinity of PLA at higher deformation ratios still remains a significant challenge, which remarkably restricts the chain mobility and reduces shape recovery efficiency. Being different from other types of biodegradable polymers, the diverse isomeric forms of PLA have provided great opportunities for modulation of PLA toward a favorable property by incorporating different PLA stereoisomers in one macromolecular architecture. In this paper, we report a completely amorphous PLA poly(ester urethane) elastomer that exhibits excellent shape fixity (>99%) and shape recovery (>99%) in a time frame of seconds. By means of adjusting the stereoisomeric ratios and control over architecture, the resultant poly(PLLA/PDLLA urethane)s (PLDU) elastomers show a single glass transition temperature (T g ), as the only thermal event, in the range of 38−46 °C in a predictable manner. The elastic moduli of PLDU elastomers display a 100-fold loss during the sharp transition from a glassy to a rubbery state with temperature alternation across their corresponding T g , indicating a successful manipulation of the thermo-mechanical properties by temperature as required in thermally induced SMPs. In addition, all samples display a typical elastomeric behavior with elongation at break (ε b ) greater than 400%. The effect of the stereoisomer content on the tensile modulus and elastic mechanical behavior were also systematically investigated. Together with the prominent degradation property, the new PLDU elastomers developed in this study show great potential for biomedical applications as shape memory implants.

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Section: ■ Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Control of PLA Stereoisomers-Based Polyurethane Elastomers as Highly Efficient Shape Memory Materials

Fan

Tan

Liu

et al. 2016

ACS Sustainable Chem. Eng.

105

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“…Biodegradable polyester (shape memory) [97] Polymers containing cinnamic groups(photo responsive) [98] Polyvinylidenfluoride (PVDF)…”

Section: Salt Hydratesmentioning

confidence: 99%

“…If on one hand the material combinations enable to embed a great variety of adaptive effects as shape memory (SMP), shape change (SCP), absorbent (Aps)/superabsorbent (SAP), electroactive (EAP), on the other hand, it raises issues regarding material separation in the end of life stage. At the same time, biodegradable solutions are increasingly developed, possibly becoming a solution to the waste processing issue [97]. Table 8 reports on the available components and the LCA aspects involved.…”

Section: Aluminium Foil Bagsmentioning

confidence: 99%

“…Bio-compatible and eco-friendly AM solutions are however already available as the field of material sciences is quickly developing clean alternatives with increasingly better adaptive performance, either using less resource consuming productive processes [40,71,72], or biodegradable alternatives [95,97]. Bio-AMs can therefore be expected to quickly improve their service life and become increasingly cheap and interesting for the field of architecture.…”

Section: A1-a2 Raw Materials and Transport To Manufacturing Sitementioning

confidence: 99%

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Review and Mapping of Parameters for the Early Stage Design of Adaptive Building Technologies through Life Cycle Assessment Tools

2019

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Adaptive Building Technologies have opened up a growing field of architectural research aimed at improving the overall building performance, ensuring comfort while reducing operational energy consumption. Focusing on flexibility over short timeframes, these new technologies are however rarely designed within the broader frame of sustainability over their entire lifecycle. How sustainable these zero energy technologies really are is yet to be established. The purpose of the research is to develop a flexible easy-to-use Life Cycle Assessment (LCA) tool to support creative innovation and sustainable design choices in the early concept and design stages of Adaptive Building Technologies. This paper reports on the results of the first step of the research, providing a mapping in terms of structure and contents of the parameters involved in the design of these technologies. Addressed from a holistic point of view, the elements of the system were defined though a qualitative approach: relevant parameters were collected through document analysis, reviewing the state-of-the-art technology through online databases as ScienceDirect, Scopus, MDPI, ResearchGate, and organized according to hierarchy and relevance in the different life cycle stages. As a result, the paper identifies (1) relevant parameters defining the design of Adaptive Building Technologies; (2) materials, processes and concepts specific to the design of these technologies, as compared to conventional building technologies; (3) issues and knowledge gaps to enable successive research phases; (4) specific actions in each life cycle stage for designers and producers to optimize the design of the technology. The mapping graphically and hierarchically organizes the elements of the system within a flexible structure to be implemented and integrated over time, as the technology evolves, to support parametric design and enable alternative design concepts to arise within a cradle-to-cradle perspective.

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