Polylactide-b-poly(ethylene-co-butylene)-b-polylactide thermoplastic elastomers: role of polylactide crystallization and stereocomplexation on microphase separation, mechanical and shape memory properties

Huang, Yunyun; Pan, Pengju; Shan, Guorong; Bao, Yongzhong

doi:10.1039/c4ra08612k

Cited by 31 publications

(25 citation statements)

References 50 publications

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“…where ΔH cc refers to the crystallization enthalpy of biocomposites and ΔH 0 refers to the enthalpy value during 100% crystallization of PLA, which is 93.6 J/g [20]. X PLA refers to the weight ratio of PLA in PLA/BP biocomposites.…”

Section: Differential Scanning Calorimetry (Dsc) Analysismentioning

confidence: 99%

Pyrolysis kinetics and mechanical properties of poly(lactic acid)/bamboo particle biocomposites: Effect of particle size distribution

Zhang

Liang

Qian

et al. 2020

Nanotechnology Reviews

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AbstractBamboo particle (BP)-reinforced poly(lactic acid) (PLA) biocomposites were fabricated. The effect of the BP particle size distribution on the pyrolysis and mechanical properties of PLA biocomposites was evaluated. The optimum particle size of BP for improving the tensile strength PLA biocomposites is 200 mesh (16.6–84.5 µm). The pyrolysis mechanism and kinetics were studied according to the Coats–Redfern method. The addition of BP inhibited the pyrolysis process of PLA. The activation energy of biocomposites ranged from 120.7 to 151.5 kJ/mol, which is significantly higher than that of the neat PLA. The pyrolysis mechanisms of biocomposites are attributed to the chemical reaction at low pyrolysis temperature (270–400℃) and ash layer diffusion control at high pyrolysis temperature (400–600℃). Crystallization behavior of biocomposites showed that small BPs in PLA biocomposites generated more cross-linking points in the PLA matrix, which constrained the movement of the molecular chain and acted as an effective nucleating agent in promoting the crystallization process. The pyrolysis behavior and mechanical properties analysis provide critical information for potential large-scale production of the PLA biocomposites.

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Section: Differential Scanning Calorimetry (Dsc) Analysismentioning

confidence: 99%

Pyrolysis kinetics and mechanical properties of poly(lactic acid)/bamboo particle biocomposites: Effect of particle size distribution

Zhang

Liang

Qian

et al. 2020

Nanotechnology Reviews

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“…Adapted from [103] Another study demonstrated the influence of the stereocomplexation between PLLA and PDLA incorporated in triblock copolymers on microphase separation, mechanical and shape-memory properties. [104,105] The SMPs were synthesized by ROP of LLA and/or DLA with poly(ethylene-co-butylene) as initiator. An increased T m from 160 °C to 220 °C was detected for enantiomeric blends due to the formation of PLLA/PDLA stereocomplex crystallites.…”

Section: Thermoplastic Elastomeric Copolymer Networkmentioning

confidence: 99%

Recent advances in degradable lactide-based shape-memory polymers

Balk

Behl

Wischke

et al. 2016

Advanced Drug Delivery Reviews

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Biodegradable polymers are versatile polymeric materials that have a high potential in biomedical applications avoiding subsequent surgeries to remove, for example, an implanted device. In the past decade, significant advances have been achieved with poly(lactide acid) (PLA)-based materials, as they can be equipped with an additional functionality, that is, a shape-memory effect (SME). Shape-memory polymers (SMPs) can switch their shape in a predefined manner upon application of a specific external stimulus. Accordingly, SMPs have a high potential for applications ranging from electronic engineering, textiles, aerospace, and energy to biomedical and drug delivery fields based on the perspectives of new capabilities arising with such materials in biomedicine. This study summarizes the progress in SMPs with a particular focus on PLA, illustrates the design of suitable homo- and copolymer structures as well as the link between the (co)polymer structure and switching functionality, and describes recent advantages in the implementation of novel switching phenomena into SMP technology.

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“…For instance, Yuan et al fabricated a fully bio‐based SMP by combining PLA, natural rubber, and thermoplastic vulcanizates together . Huang et al verified that SMP behavior can be observed from polylactide‐ b ‐poly(ethylene‐ co ‐butylene)‐ b ‐polylactide (PLA–PEB–PLA) triblock copolymers and that its performance can be controlled by adjusting the crystallizability of the PLA segments . Samuel et al reported a novel SMP composite that has multishape memory capability by integrating poly( l ‐lactide) (PLLA) with poly(methyl methacrylate) (PMMA) …”

Section: Introductionmentioning

confidence: 99%

Room temperature deformable shape memory composite with fine‐tuned crystallization induced via nanoclay particles

Sun

Cai

Ren

et al. 2017

J Polym Sci B Polym Phys

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It is known that particular types of semi‐crystalline/elastomer polymer blends exhibit shape memory effects (SME) due to the dispersion of two immiscible phases. In this study, the crystal structure of polylactic acid (PLA)/ thermoplastic polyurethane (TPU) based shape memory polymer (SMP) is altered by incorporating small amounts of montmorillonite (MMT) nanoclay. The results indicate the incorporation of MMT can improve the compatibility of the two different polymers. Moreover, the presence of MMT affects the total crystallinity of the SMP and improves mechanical properties. Lastly, uniaxial stretching deformation can be applied to the SMP at room temperature conditions while maintaining its shape memory properties. With 1 wt % MMT particles, the recovery ratio (Rr) was nearly 95%, which indicated a strong recovery effect. The shape‐fixing ratio (Rf) remained above 95% for all composites due to plastic deformation applied at room temperature. © 2017 Wiley Periodicals, Inc. J. Polym. Sci., Part B: Polym. Phys. 2017, 55, 1197–1206

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Polylactide-b-poly(ethylene-co-butylene)-b-polylactide thermoplastic elastomers: role of polylactide crystallization and stereocomplexation on microphase separation, mechanical and shape memory properties

Abstract: PLA–PEB–PLA copolymers containing PLA segments with different stereo-regularities were prepared via the ROP of various lactides using PEB as the macromolecular initiator.

Cited by 31 publications

References 50 publications

Pyrolysis kinetics and mechanical properties of poly(lactic acid)/bamboo particle biocomposites: Effect of particle size distribution

Pyrolysis kinetics and mechanical properties of poly(lactic acid)/bamboo particle biocomposites: Effect of particle size distribution

Recent advances in degradable lactide-based shape-memory polymers

Room temperature deformable shape memory composite with fine‐tuned crystallization induced via nanoclay particles

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