Achieving all-polylactide fibers with significantly enhanced heat resistance and tensile strength via in situ formation of nanofibrilized stereocomplex polylactide

Zhang, Huixian; Bai, Hongwei; Deng, Shihao; Liu, Zhenwei; Zhang, Qin; Fu, Qiang

doi:10.1016/j.polymer.2019.01.040

Cited by 47 publications

(21 citation statements)

References 60 publications

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“…Apparently, large amounts of PLLA crystallites with large size were developed in the PLLA/P34HB blend fibers prepared at high take‐up speeds, serving as physical crosslinks to establish a thermally stable network and further improve the heat resistance. However, the relatively fewer PLLA crystallites in the blend fibers prepared at low take‐up speed were unable to withstand the shrinking force on heating, 8,38 resulting in higher boiling water shrinkage.…”

Section: Resultsmentioning

confidence: 99%

“…Concept of polymer alloy is also regarded as an economical and practical pathway to regulate synergetic performance 9,13 . For instance, all PLA‐based fibers with outstanding heat resistance were fabricated by adding low content of poly(D‐lactide) (PDLA), ascribed to the formation of nanofibrillar stereocomplex polylactide (SC‐PLA) 8 . Besides, PLA/poly(butylene succinate) (PBS) blend fibers containing a low content of PBS were produced to improve the heat resistance of the blend fibers, in which the addition of PBS favored the crystallization of PLA 10 …”

Section: Introductionmentioning

confidence: 99%

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Toward heat resistant polylactide blend fibers via incorporation of low poly[(R)‐3‐hydroxybutyrate‐co‐4‐hydroxybutyrate] content

Shi

Huang

Li³

et al. 2022

J of Applied Polymer Sci

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Blending high content of polyhydroxyalkanoates (PHAs ≥ 30 wt.%) with polylactide (PLA) provides an effective strategy to significantly improve heat resistance of PLA fibers. However, it has proven challenging to maintain good spinnability of the PLA/PHAs blends with the high content of PHAs. In this study, a series of poly(L‐lactide) (PLLA)/poly[(R)‐3‐hydroxybutyrate‐co‐4‐hydroxybutyrate] (P34HB) blend fibers with low P34HB content (≤ 8 wt.%) is successfully fabricated with excellent spinnability. The incorporation of P34HB contributes to a substantially improved heat resistance of the PLLA/P34HB blend fibers, as evidenced by a notable reduction in boiling water shrinkage from ca. 80% to 9%. This exceptionally improved heat resistance is closely related to substantial increase in crystallinity of PLLA in the blend fibers. Specifically, the addition of low P34HB content remarkably enhances chain mobility of PLLA chains, as such reduces crystallization half‐times (t1/2) and accelerates crystallization of PLLA. In fact, the amorphous P34HB phase favors crystal growth of PLLA phase rather than heterogeneous nucleation inferred previously. These results provide a facile and effective method to produce PLLA/P34HB blend fibers with enhanced heat resistance and sound spinnability.

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Section: Resultsmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Toward heat resistant polylactide blend fibers via incorporation of low poly[(R)‐3‐hydroxybutyrate‐co‐4‐hydroxybutyrate] content

Shi

Huang

Li³

et al. 2022

J of Applied Polymer Sci

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“…Various methods are proposed to prepare monofilaments such as melt spinning, dry spinning, and electrospinning in which melt spinning is a solvent-free method to produce fibers serving especially for medical appliances. [14][15][16][17][18] To improve the mechanical properties of monofilaments, solid-state drawing (SSD) method is always chosen which is carried out between the glass transition temperature and the melting temperature of PLLA. 19,20 To fabricate the braided stent, stent is first braided on a special mold, and then annealed at 100 C for 1 h. 21 Many studies have shown that shrinkage occurs during unconstrained annealing process for solid-state drawn PLLA monofilaments.…”

Section: Introductionmentioning

confidence: 99%

Effects of annealing constraint methods on poly(L‐lactic acid) monofilaments for application in stents annealing

Tian

Zhang

et al. 2021

Polymers for Advanced Techs

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Mechanical properties of poly(L-lactic acid) (PLLA) braided stents are closely related to the performance of the weaving monofilaments. In this study, the PLLA monofilaments were prepared via solid-state drawing (SSD) method and annealed with different constraint methods. Experimental results show that mechanical properties of fabricated monofilaments have been greatly improved by SSD method. With the constrained annealing method, mechanical properties can be further improved while negative effect is shown with unconstrained annealing method. The physicochemical properties of PLLA monofilaments were further characterized, and it is found that the draw ratio of SSD and annealing method can affect the crystallinity and crystallite size, which can directly influence the mechanical properties of the monofilaments.This work tells that it is necessary to consider collectively the effects of SSD method and annealing method of the monofilaments in order to obtain optimized mechanical properties of the braided stents.

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“…We analysed the degree of orientation of the PP melt-blown fibre mat by calculating the Herman's orientation factor (f) [38], applying Equations ( 6) and ( 7):…”

Section: Morphologymentioning

confidence: 99%

Single Polymer Composites Made of Melt-blown PP Mats and the Modelling of the Uniaxial Tensile Behaviour by the Fibre Bundle Cells Method

et al. 2021

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In this study, we generated polypropylene fibre mats via melt blowing (average diameter:1.03 µm), and then produced self-reinforced composites using hot compaction and investigated the effect of the processing temperature. Scanning electron microscopy (SEM) revealed that our composites had good consolidation, low void content and besides, the fibres and the matrix were clearly distinguishable. The differential scanning calorimetry (DSC) tests showed that the composites are easy to recycle by re-melting. The tensile tests of the melt-blown nonwovens and the produced composites revealed that increasing the temperature of hot compaction results in embrittlement (from ductile to brittle) of the samples, which means higher specific tensile forces and smaller deformations. Using the Fibre Bundle Cells modelling method, we developed a phenomenological, analytical model to describe the total tensile curve (both the deformation and the failure behaviour) and analyse the tensile properties of these hot compacted composites. The determination coefficients (R 2 ) between the modelled and measured force were larger than 0.99 and the relative mean squared error (RMSE) values (related to the measured maximum force 2 value) were smaller than 3% in every examined case, which indicated good modelling. Hence, the FBC model not only described the tensile behaviour of the nonwovens well, but it was also applicable for the composites.

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Achieving all-polylactide fibers with significantly enhanced heat resistance and tensile strength via in situ formation of nanofibrilized stereocomplex polylactide

Cited by 47 publications

References 60 publications

Toward heat resistant polylactide blend fibers via incorporation of low poly[(R)‐3‐hydroxybutyrate‐co‐4‐hydroxybutyrate] content

Toward heat resistant polylactide blend fibers via incorporation of low poly[(R)‐3‐hydroxybutyrate‐co‐4‐hydroxybutyrate] content

Effects of annealing constraint methods on poly(L‐lactic acid) monofilaments for application in stents annealing

Single Polymer Composites Made of Melt-blown PP Mats and the Modelling of the Uniaxial Tensile Behaviour by the Fibre Bundle Cells Method

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