Influence of in Vitro Degradation of a Biodegradable Nanocomposite on Its Shape Memory Effect

Yu, Xiaolan; Zhou, Shaobing; Zheng, Xiaotong; Xiao, Yu; Guo, Tao

doi:10.1021/jp9022986

Cited by 35 publications

(28 citation statements)

References 33 publications

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“…Note that the SM characteristics are markedly reduced with the degradation time. This was shown on example of PCL-based systems degraded in vitro [69]. T trans adjustment to body temperature and controlled biodegradability will remain preferred research topics further on [70].…”

Section: Discussionmentioning

confidence: 98%

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: Discussionmentioning

confidence: 98%

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

Karger‐Kocsis

Kéki

2014

Express Polym. Lett.

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“…The lactic acid resulting from the degradation of PLLA was neutralized effectively by surface modified magnesia[166]. Thus, Fe 3 O 4 can facilitate the infiltration of degradation medium into composite and promote its degradation[169]. The rate of enzymatic degradation of P(3HB-co-4HB) has enhanced significantly in nanocomposites of poly(3- hydroxybutyrate-co-4-hydroxybutyrate) [P(3HB-co-4HB)]/silica.…”

mentioning

confidence: 99%

Controlled biodegradation of polymers using nanoparticles and its application

Kumar

Maiti

2016

RSC Adv.

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The disposal of non-degradable plastics is augmented exponentially as a result of poor recycling efficacy. The development of biodegradable plastics has become indispensable in last two decades because of its origin from renewable resources. The potential interest in biodegradable plastics involves eco-friendly obliteration via microbial action which transform into carbon dioxide and water resulting pollution free natural system. Even though its lucrative interest lies in multiple areas, some of the properties such as brittleness, poor thermal, mechanical and low gas barrier properties restrict their practical uses. Incorporation of nanoparticle in polymer matrix or by making nanocomposites overcomes the shortcomings of the biodegradable polymers. For further improving the aforementioned properties, several approaches have been utilized especially incorporation of nanoparticle in polymer matrix to prepare nanocomposites. One of the great advantages of nanoparticles is to tune the rate of biodegradation (both increase and decrease as compared to the rate of pure polymer) depending upon the need. Thus, chemical, physical and biological properties of the biodegradable polymers can be modified and controlled for sustainable application in medical and other areas. This review considers the major concerns about the type of biodegradable polyesters and their nanocomposites, great details about mechanism of biodegradation, factors influencing the biodegradation and their applications in biomedical and packaging industries.

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“…To demonstrate this, Yu et al showed the decreased recovery ratios of a magnetite-filled, crosslinked PCL network. After up to 14 weeks in phosphate-buffered saline, the total recovery time and gel fraction of the networks significantly decreased, showing a notable relationship between increasing magnetite filler ratio and decreased mechanical properties [105].…”

Section: Enhancing Biocompatibilitymentioning

confidence: 98%

Shape Memory Polymer–Inorganic Hybrid Nanocomposites

Reit

Lund

Voit

2014

Organic-Inorganic Hybrid Nanomaterials

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Shape memory polymers (SMPs) have been the focus of much research over the last few decades. From the novelty of temporarily fixing a threedimensional shape from a planar polymer sheet, to the uses that SMPs are seeing today as softening biomedical implants and self-deploying hinges, this class of smart materials has successfully been used to tackle a variety of biological, electrical, and mechanical problems. However, the properties of these networks are limited by the organic nature of the SMPs. To enhance their properties, researchers across the globe have looked into imparting the desirable properties of inorganic composite materials to these polymer networks. As the field of shape memory polymer composites began to grow, researchers quantified the unique enhancements that came at varying filler loading levels as a result of controlled material interface interactions. Specifically, the incorporation of nanofillers of various shapes and sizes leads to increased internal interfacial area relative to micro-and macrocomposites at identical loading fractions and imparts interesting mechanical, optical, electrical, thermal, and magnetic properties to these emerging nanocomposites. This new class of material, referred to in this review as shape memory polymer-inorganic nanocomposites (SMPINCs), allows a host of new interactions between the smart polymer and its surrounding environment as a result of the ability to control the internal environment of the polymer network and nanofiller. In this work, the reader is introduced to both the methods of preparing these composites and the effects the fillers have on the biological, electromagnetic, and mechanical properties of the resulting composite.

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Influence of in Vitro Degradation of a Biodegradable Nanocomposite on Its Shape Memory Effect

Cited by 35 publications

References 33 publications

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

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

Controlled biodegradation of polymers using nanoparticles and its application

Shape Memory Polymer–Inorganic Hybrid Nanocomposites

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