Shape memory properties of melt-blended polylactic acid (PLA)/thermoplastic polyurethane (TPU) bio-based blends

Lai, Sun‐Mou; Lan, Yu-Chi

doi:10.1007/s10965-013-0140-6

Cited by 156 publications

(109 citation statements)

References 21 publications

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“…A 'byproduct' of this research was the observation that some blends, in fact, showed SM feature. Lai and Lam [46] studied the SM performance of PLA/ thermoplastic PU (TPU) blends at 70/30 and 50/50 compositions. TPU was found in dispersed form at 70/30 ratio, while a bicontinuous phase structure was concluded for the PLA/PU = 50/50.…”

Section: Blendsmentioning

confidence: 99%

Biodegradable polyester-based shape memory polymers: Concepts of (supra)molecular architecturing

Karger‐Kocsis

Kéki

2014

Express Polym. Lett.

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Shape memory (SM) biodegradable polymers (SMPs) and related composites are emerging smart materials in different applications. SMPs may adopt one (dual-shape), two (triple-shape) or several (multishape) stable temporary shapes and recover their permanent shape (or other temporary shapes in case of multi-shape versions) upon the action of an external stimulus. The external stimulus may be temperature, pH, water, light irradiation, redox condition etc. In most cases, however, the SMPs are thermally activated. The 'switching' or transformation temperature (T trans ), enabling the material to return to its permanent shape, is either linked with the glass transition (T g ) or with the melting temperature (T m ).Thus, SMPs are often subdivided based on their switch types into T g -or T m -based SMPs. As reversible 'switches' other mechanisms such as liquid crystallization and related transitions, supermolecular assembly/disassembly, irradiation-induced reversible network formation, formation and disruption of a percolation network, may also serve [1]. The permanent shape is guaranteed by physical or chemical network structures. The latter may be both on molecular and supramolecular levels. Linkages of these networks are termed net points. The temporary shape is created by mechanical deformation above T trans . In some cases the deformation temperature may be below Abstract. Shape memory polymers (SMPs) are capable of memorizing one or more temporary shapes and recovering to the permanent shape upon an external stimulus that is usually heat. Biodegradable polymers are an emerging family within the SMPs. This minireview delivers an overlook on actual concepts of molecular and supramolecular architectures which are followed to tailor the shape memory (SM) properties of biodegradable polyesters. Because the underlying switching mechanisms of SM actions is either related to the glass transition (T g ) or melting temperatures (T m ), the related SMPs are classified as T g -or T m -activated ones. For fixing of the permanent shape various physical and chemical networks serve, which were also introduced and discussed. Beside of the structure developments in one-way, also those in two-way SM polyesters were considered. Adjustment of the switching temperature to that of the human body, acceleration of the shape recovery, enhancement of the recovery stress, controlled degradation, and recycling aspects were concluded as main targets for the future development of SM systems with biodegradable polyesters.

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Section: Blendsmentioning

confidence: 99%

Biodegradable polyester-based shape memory polymers: Concepts of (supra)molecular architecturing

Karger‐Kocsis

Kéki

2014

Express Polym. Lett.

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“…The tensile strength of TPU improves with the addition of PLA, and the toughness of TPU increases significantly with the addition of PLA [20,21]. In addition, TPU endows PLA with excellent shape memory properties in the TPU/PLA blend [22]. We have reported in previous studies that TPU and PLA form immiscible and compatible polymer blends in the TPU/PLA compositions of 50/50, 65/35, and 80/20; these polymer blends also exhibited uniform mechanical properties [20,23].…”

Section: Introductionmentioning

confidence: 99%

Biocompatible shape memory polymer actuators with high force capabilities

Song

Chang

Naguib

2015

European Polymer Journal

101

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“…In recent year, PLA has been used in medical devices, industries, textiles, food packages, etc. [1][2][3][4][5]. With the widespread use and increasing consumption of PLA, the amount of waste PLA generated is growing rapidly.…”

Section: Introductionmentioning

confidence: 99%

Ferric chloride as an efficient and reusable catalyst for methanolysis of poly(lactic acid) waste

et al. 2015

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Ferric chloride (FeCl 3 ) was used to catalyze the methanolysis of poly(lactic acid) (PLA) to recover methyl lactate. The effects of experimental parameters such as reaction temperature, reaction time, amount of FeCl 3 and dosage of methanol on results were studied in detail. The results showed that under the optimized reaction conditions of n(methanol):n(PLA)=5:1, n(FeCl 3 ):n(PLA)=0.01:1, 130°C and 4.0 h, the conversion of PLA reached 96.0 % and the yield of methyl lactate was up to 87.2 %. FeCl 3 could be repeatedly used at least 6 times without significant decrease in the conversion of PLA and yield of methyl lactate under the given conditions. The kinetics of the reaction was also investigated. The results indicated that the methanolysis of PLA catalyzed by FeCl 3 was a first-order kinetic reaction with activation energy of 32.41 kJ/mol.

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Shape memory properties of melt-blended polylactic acid (PLA)/thermoplastic polyurethane (TPU) bio-based blends

Cited by 156 publications

References 21 publications

Biodegradable polyester-based shape memory polymers: Concepts of (supra)molecular architecturing

Biodegradable polyester-based shape memory polymers: Concepts of (supra)molecular architecturing

Biocompatible shape memory polymer actuators with high force capabilities

Ferric chloride as an efficient and reusable catalyst for methanolysis of poly(lactic acid) waste

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