Tailoring Crystallization: Towards High‐Performance Poly(lactic acid)

Liu, Guoming; Zhang, Xiuqin; Wang, Dujin

doi:10.1002/adma.201305413

Cited by 212 publications

(144 citation statements)

References 77 publications

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“…The 2q angle ranged from 10 to 30 with a rate of 2 C/min at room temperature. 20 5.0 20.0 1.36 MPEG 5 -PLLA 28 5.0 27.8 1.27 2PEG 10 -PLLA 4 10.0 3.8 1.05 2PEG 10 -PLLA 8 10.0 8.0 1.06 2PEG 10 -PLLA 17 10.0 16.9 1.13 2PEG 10 -PLLA 28 10. …”

Section: Characterizationmentioning

confidence: 98%

“…In contact to the petroleum-based plastics, such as polyethylene, polypropylene and polystyrene, PLA can be produced from renewable biomass [2]. Above all, PLA possessed good clarity, relatively high modulus and strength, which can be compared with the three widely used general-purpose plastics [3,4]. Nowadays, more and more advantageous applications of PLA or PLA-based materials are developed for industry and agriculture parts, which are required to improve the thermal and mechanical properties of this environmentally friendly polymer.…”

Section: Introductionmentioning

confidence: 98%

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Crystallization behavior of PEG/PLLA block copolymers: Effect of the different architectures and molecular weights

Zhou

Shao

et al. 2015

Polymer

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Section: Characterizationmentioning

confidence: 98%

Section: Introductionmentioning

confidence: 98%

Crystallization behavior of PEG/PLLA block copolymers: Effect of the different architectures and molecular weights

Zhou

Shao

et al. 2015

Polymer

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“…Specifically, the stent lost structural integrity after 36 weeks of degradation (immersed in saline at 37 °C) and the collapse pressure decreased by half at 30 weeks. The in vitro degradation study by Liu et al [26] showed that PLLA porous scaffolds exhibited a reduction in compressive modulus and strength during a degradation time of 200 days. Recently, Rodrigues et al [21] carried out an in vitro degradation study of porous PLA scaffold immersed in phosphate-buffered-saline solution for 8 weeks.…”

Section: Degradation Behaviourmentioning

confidence: 99%

Research into biodegradable polymeric stents: a review of experimental and modelling work

Qiu¹,

Zhao²

2018

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Bioresorbable stents (BRSs) are regarded as the next-generation medical devices to treat blocked or diseased arteries.The use of BRSs aims to reduce the risk of late stent thrombosis and long-term tissue inflammation associated with permanent metallic stents. BRSs are designed to relieve symptoms immediately and also provide mechanical support for an appropriate time period before they are fully absorbed by human body. To promote clinical adoption of BRSs or even to substitute metallic stents, the mechanical performance of BRSs needs to be thoroughly investigated and quantitatively characterised, especially over the full period of degradation. This paper offers a review of current research status of polymeric BRSs, covering both experimental and modelling work. Review of experimental studies highlighted the effects of stent designs and materials on the behaviour of polymeric BRSs. Computational work was able to simulate crimping, expansion and degradation of polymeric BRSs and the results were useful for performance assessment. In summary, the development of polymeric BRSs is still at an early stage, and further research is urgently required for a better understanding and control of their mechanical performance.

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“…[1][2][3][4][5][6] However, practical application of PLA is signicantly restricted by its inherent brittleness, as evidenced by its limited elongation at break. Plasticizers are frequently used to increase the exibility and ductility of PLA.…”

Section: Introductionmentioning

confidence: 99%

Balanced strength and ductility improvement of in situ crosslinked polylactide/poly(ethylene terephthalate glycol) blends

et al. 2015

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Polylactide (PLA) is strong and stiff but brittle while poly(ethylene terephthalate glycol) (PETG) is flexible. In view of their complementary properties, PETG was blended with PLA via reactive melt blending to overcome the drawbacks of PLA, aiming at applications in the packaging industry. During reactive blending, crosslinking reaction between PLA chains and methylene diphenyl diisocyanate (MDI) led to improved melt elasticity, viscosity and molecular mass evaluated by various rheological plots including storage and loss modulus, viscosity, loss tangent, weighted relaxation spectra, and molecular weight distribution curves. Interfacial compatibilization occurred between PLA and PETG through the reaction of free isocyanate groups on the crosslinked PLA chains with the terminal hydroxyl groups of the PETG chains. The variation of viscoelasticity of the PLA matrix and interfacial compatibilization resulted in fine phase morphology and enhanced interfacial adhesion of the blends. Thus, the failure mode of the blends changed from brittle fracture of neat PLA to ductile fracture. The resulting PLA-MDI/PETG blends displayed a significant improvement in the elongation at break and a simultaneous improvement of tensile strength, maintaining the high tensile modulus.

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Tailoring Crystallization: Towards High‐Performance Poly(lactic acid)

Cited by 212 publications

References 77 publications

Crystallization behavior of PEG/PLLA block copolymers: Effect of the different architectures and molecular weights

Crystallization behavior of PEG/PLLA block copolymers: Effect of the different architectures and molecular weights

Research into biodegradable polymeric stents: a review of experimental and modelling work

Balanced strength and ductility improvement of in situ crosslinked polylactide/poly(ethylene terephthalate glycol) blends

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