Crystallization behavior and mechanical properties of poly(lactic acid)/poly(ethylene oxide) blends nucleated by a self-assembly nucleator

Kong, Weili; Tong, Beibei; Ye, Aolin; Ma, Ruixue; Gou, Jiaomin; Wang, Yaming; Liu, Chuntai; Shen, Changyu

doi:10.1007/s10973-018-7528-9

Cited by 23 publications

(15 citation statements)

References 53 publications

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“…An appropriate crystallinity would confer load-bearing properties to PLA at temperatures higher than T g . Also, the use of nucleating agents to support crystallization and fillers to reinforce the PLA will overcome the non-complying HDT [ 36 , 37 ]. The brittleness of original PLA makes its materials vulnerable to a sudden applied load.…”

Section: Poly(lactic Acid) (Pla)—general Outlookmentioning

confidence: 99%

Dynamic Mechanical Analysis Investigations of PLA-Based Renewable Materials: How Are They Useful?

Cristea¹,

Ionita²,

Iftime³

2020

Materials

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Interest in renewable polymers increased exponentially in the last decade and in this context poly(lactic acid) (PLA) became the leader mainly for practical reasons. Nevertheless, it is outstanding also from a scientific point of view, because its thermal and morphological properties are offering challenging new insights. With regard to dynamic mechanical analysis (DMA), PLA does not have the classical behavior of a thermoplastic polymer. Often, overlapping events (enthalpic relaxation, glass transition and crystallization) that occur as the temperature increases make the DMA result of a PLA look inexplicable even for polymer scientists. This review offers a perspective of the main phenomena that can be revealed in a DMA experiment and systematizes the information that can be obtained for every region (glassy, glass transition, rubbery, cold-crystallization and melting). Also, some unusual patterns registered in some cases will be commented upon. The review intends to offer indices that one should pay attention to in the interpretation of a DMA experiment, even if the investigator has only basic skills with DMA investigations.

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Section: Poly(lactic Acid) (Pla)—general Outlookmentioning

confidence: 99%

Dynamic Mechanical Analysis Investigations of PLA-Based Renewable Materials: How Are They Useful?

Cristea¹,

Ionita²,

Iftime³

2020

Materials

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“…8a, the differences between the two approaches of recrystallization can be examined in detail. Indexing of the observed reflections, based on the crystal structures reported for the α and α′ polymorphs, is shown as well [22,24,69]. For comparison, the diffraction patterns of E-45 and H-45 samples are normalized using the strongest 110/200 reflection intensity.…”

Section: X-ray Diffraction (Xrd) Measurementsmentioning

confidence: 99%

Effects of thermal annealing and solvent-induced crystallization on the structure and properties of poly(lactic acid) microfibres produced by high-speed electrospinning

Vadas

Nagy

Csontos

et al. 2020

J Therm Anal Calorim

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This research concentrates on the marked discrepancies in the crystalline structure of poly(lactic acid) (PLA) nano-and microfibres, achieved by different annealing strategies. PLA nonwoven mats were produced by high-speed electrospinning. The high-speed production technique allowed the manufacturing of PLA microfibres with diameters of 0.25-8.50 µm with a relatively high yield of 40 g h −1. The crystalline content of the inherently highly amorphous microfibres was increased by two methods; thermal annealing in an oven at 85 °C was compared to immersion in absolute ethanol at 40 °C. The morphology of the fibres was examined by scanning electron microscopy; crystalline forms and thermal properties were assessed using X-ray diffractometry, Raman spectrometry, differential scanning calorimetry (DSC) as well as modulated DSC. As a consequence of 45-min heat treatment, the crystalline fraction increased up to 26%, while solution treatment resulted in 33% crystallinity. It was found that only disordered α′ crystals are formed during the conventional heat treatment; however, the ethanol-induced crystallization favours the formation of the ordered α polymorph. In connection with the different crystalline structures, noticeable changes in the macroscopic properties such as heat resistance and mechanical properties were evinced by localized thermomechanical analysis and static tensile test, respectively.

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“…Adding nucleation agent is a facile approach to promote PLA crystallization 5,11–22 . Self‐assembly nucleators such as N,N′,N″‐tricyclohexyl‐1,3,5‐benzenetricarboxylamide (BTCA), 17–20 N,N′‐bis(benzoyl) hexanedioic acid dihydrazide 21 and oxalamide derivatives 22 have revealed interesting effect on PLA crystallization. The nucleators can dissolve into PLA melt upon heating; while during subsequent cooling, they self‐assemble into supermolecular frameworks and guiding the formation of various crystal morphologies of PLA including cone‐like, shish‐kebab, and needle‐like structures 17,20 .…”

Section: Recent Advances In Pla Crystallizationmentioning

confidence: 99%

Crystallization behavior of poly(lactic acid) and its blends

Wang¹,

Liu²,

Shen³

2020

Polymer Crystallization

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Poly(lactic acid) (PLA) is one of the most interesting bio‐based biodegradable alternatives, with great promise to replace petroleum‐based plastics. However, the intrinsic slow crystallization ability of PLA restricts its extensive applications. In this perspective, we highlight some recent advances in PLA crystallization, including nucleation by self‐assembly nucleating agents, self‐nucleation (or memory effect), conformational ordering in the very early stage of crystallization, crystal nucleation investigated by fast scanning calorimetry (Flash DSC), crystallization under flow, and pressure fields, and crystallization of enantiomeric blends. Finally, major challenges and future perspectives are proposed.

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Crystallization behavior and mechanical properties of poly(lactic acid)/poly(ethylene oxide) blends nucleated by a self-assembly nucleator

Cited by 23 publications

References 53 publications

Dynamic Mechanical Analysis Investigations of PLA-Based Renewable Materials: How Are They Useful?

Dynamic Mechanical Analysis Investigations of PLA-Based Renewable Materials: How Are They Useful?

Effects of thermal annealing and solvent-induced crystallization on the structure and properties of poly(lactic acid) microfibres produced by high-speed electrospinning

Crystallization behavior of poly(lactic acid) and its blends

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