Controlling stereocomplex crystal morphology in poly(lactide) through chain alignment

Tuccitto, Anthony V.; Anstey, Andrew; Sansone, Nello D.; Park, Chul; Lee, Patrick

doi:10.1016/j.ijbiomac.2022.07.081

Cited by 14 publications

(6 citation statements)

References 49 publications

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“…In the SAOS test for the blend and nanocomposite FDY fiber samples, it was observed that the mobility of the PP chains was limited, by an increase in the contact surface and the presence of the structure of PBT fibrils and rigid nanoparticles, which has led to an increase in the complex viscosity and melt strength of the PP matrix. 27,40,41 percolated nanoparticles network in the matrix, led to a plateau appearing in the storage modulus along with a complex viscosity upturn as reported in previous works. [42][43][44] Studies have shown that the incorporation of nanoclay into polymers can modify the rheological properties due to the formation of interfacial connections between the matrix polymer and the nanoclay surfaces; in fact, nanoclay has played a compatiblizing role.…”

Section: Rheological Behaviorsupporting

confidence: 79%

“…In the SAOS test for the blend and nanocomposite FDY fiber samples, it was observed that the mobility of the PP chains was limited, by an increase in the contact surface and the presence of the structure of PBT fibrils and rigid nanoparticles, which has led to an increase in the complex viscosity and melt strength of the PP matrix. 27,40,41 Figure 5(b) shows the SAOS results, the storage modulus (G′) as a function of frequency for the FDY fiber samples with different contents of nanoclay. storage modulus (G′) exhibited a nearly linear incremental trend for all FDY fiber samples in the covered frequency range.…”

Section: Resultsmentioning

confidence: 99%

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Dual role of nanoclay in the improvement of the in-situ nanofibrillar morphology in polypropylene/polybutylene terephthalate nanocomposites

Seraji

Bajgholi

2022

Journal of Industrial Textiles

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The present study has addressed the effects of nanoclay on the properties of polypropylene (PP)/polybutylene terephthalate (PBT) blend fibers such as their dyeability and, rheological and resiliency behaviors which are produced by melt spinning. The results of the differential scanning calorimetry (DSC) analysis indicated that the presence of both nanoclay and PBT significantly influenced the crystallinity of PP which also confirmed their nucleating effects on the nanocomposite fibers. Compared to neat PP fibers, the incorporation of 0.5–1wt.% of nanoclay and 10 wt.% of PBT nanocomposite fibers caused approximately 23% and 52% enhancements in the resiliency and dye uptake respectively without using toxic carriers. The rheological analysis was carried out for investigating the viscoelastic behavior, and microstructural and dispersion of nanoclay in the nanocomposite fibers. The rheological behavior in the small amplitude oscillatory shear (SAOS) test demonstrated the percolation threshold network of the structure of PBT fibrils in the PP matrix. When the PBT domains are fibrillated, the storage modulus (G′) and complex viscosity increase compared to neat PP. Also, the nonterminal behavior at low frequencies indicates the uniform dispersion of nanoclay in fiber nanocomposites. These all cause the improvement of the melt strength of the PP matrix. Transmission electron microscopy (TEM) was used to study the dispersion and localization of nanoclay. Nanoclay has also played a compatibilizing role in the immisible PP/PBT blend and was localized mainly in the PBT disperse and interface, and therefore prevented coalescence. The role of the compatibility of nanoparticles is to decrease the mean diameter of the nano-fibrils to 75 nm, for the hot-drawn nanocomposite fibers, as measured by scanning electron microscopy (SEM). All of the above lead to increasing the melt strength and elasticity of the nanocomposites in the fiber spinning process.

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Section: Rheological Behaviorsupporting

confidence: 79%

“…In the SAOS test for the blend and nanocomposite FDY fiber samples, it was observed that the mobility of the PP chains was limited, by an increase in the contact surface and the presence of the structure of PBT fibrils and rigid nanoparticles, which has led to an increase in the complex viscosity and melt strength of the PP matrix. 27,40,41 Figure 5(b) shows the SAOS results, the storage modulus (G′) as a function of frequency for the FDY fiber samples with different contents of nanoclay. storage modulus (G′) exhibited a nearly linear incremental trend for all FDY fiber samples in the covered frequency range.…”

Section: Resultsmentioning

confidence: 99%

Dual role of nanoclay in the improvement of the in-situ nanofibrillar morphology in polypropylene/polybutylene terephthalate nanocomposites

Seraji

Bajgholi

2022

Journal of Industrial Textiles

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“…9 Stereocomplex crystals (SCs) can be generally obtained through careful crystallization by mixing PLLA and PDLA in a 1:1 molar ratio. Compared with the homogeneous crystals (HCs) of PLLA and PDLA, the polymer chains of the SCs are more tightly packed in the crystal lattice due to the unique intermolecular hydrogen bonds, 10,11 which leads to the excellent properties of the SCs such as high melting temperature, 12 good heat resistance, 13,14 mechanical properties, 15 and solvent resistance. 16,17 However, conventional methods such as solution casting and melt quenching often result in a mixture of HCs and SCs due to the compete for crystallization between these two crystals.…”

Section: Introductionmentioning

confidence: 99%

Effect of electrospun stereocomplex PLA fibers and modified cellulose nanocrystals on crystallization of poly(L‐lactic acid)

Wan

Zhuang

et al. 2023

J of Applied Polymer Sci

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Poly(L-lactic acid) (PLLA) is a biodegradable polymer that has attracted increasing attention due to its fantastic properties. Nevertheless, the disadvantages of PLLA, such as low crystallization rate and brittleness, limit its wide commercial applications. In the present work, electrospun stereocomplex PLA fibers (Sc-fibers) and PLLA grafted cellulose nanocrystals (g-CNCs) are prepared as nano-fillers and then blended with PLLA matrix to prepare different nanocomposites. Both of nano-fillers would accelerate the crystallization rate of PLLA, and as expected, g-CNCs have much stronger nucleation ability towards PLLA than Sc-fibers. Nevertheless, the crystallization of PLLA will decrease to some extent in the presence of both nano-fillers of g-CNCs and Scfibers due to the preferential formation of stereocomplex crystals on the surfaces of CNCs. Moreover, the presence of nano-fillers would enhance the mechanical properties of PLLA, such as the elongation at break can increase by four times after incorporating both g-CNCs and Sc-fibers. This work provides a new consideration for designing different nano-fillers, especially for polymer matrices with low crystallization ability and brittleness.

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“…Because of the superior properties arising from SC crystals compared to HC crystals, efforts have been done to selectively promote SC crystallization to exploit its advantages and improve cost-effectiveness [9,10]. Promoting SC crystallization can be achieved by manipulating processing, chain architecture, blending, and introducing nucleating agent, filler, and plasticizer compounds [9,11].…”

Section: Introductionmentioning

confidence: 99%

New opportunities for sustainable bioplastic development: Tailorable polymorphic and three-phase crystallization of stereocomplex polylactide by layered double hydroxide

Chen

Auras

Corredig

et al. 2022

International Journal of Biological Macromolecules

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Controlling stereocomplex crystal morphology in poly(lactide) through chain alignment

Cited by 14 publications

References 49 publications

Dual role of nanoclay in the improvement of the in-situ nanofibrillar morphology in polypropylene/polybutylene terephthalate nanocomposites

Dual role of nanoclay in the improvement of the in-situ nanofibrillar morphology in polypropylene/polybutylene terephthalate nanocomposites

Effect of electrospun stereocomplex PLA fibers and modified cellulose nanocrystals on crystallization of poly(L‐lactic acid)

New opportunities for sustainable bioplastic development: Tailorable polymorphic and three-phase crystallization of stereocomplex polylactide by layered double hydroxide

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