Macromol. Rapid Commun. 9/2016

Xie, Lan; Xu, Huan; Li, Zhong‐Ming; Hakkarainen, Minna

doi:10.1002/marc.201670039

Cited by 2 publications

(2 citation statements)

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“…observed that SC remained spherulitic and the spherulites growth rate did not change at the applied shear conditions. However, Xie et al . found that SC formed preferentially as central shish under shear flow.…”

Section: Introductionmentioning

confidence: 98%

Flow‐induced crystallization of polylactide stereocomplex under pressure

Song

Zhao

Yang

et al. 2018

J of Applied Polymer Sci

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Although shear and pressure fields always coexist in practical polymer processing, their combined influence on the crystallization behavior of polylactide stereocomplex (SC) is ambiguous due to the limit of experiment device. In that case, a homemade device was employed to prepare samples under the coexistence of shear and pressure and explore the crystallization behavior of SC. Differential scanning calorimetry and synchrotron radiation were used to investigate the combined effect of shear flow and pressure on SC crystallization. The results show that shear flow was helpful for SC formation. Shear flow promoted the phase mixing of the polymer blends and improved the nucleation efficiency of SC. Pressure had a negative effect on SC formation because of the decrease in free volume. Regard to polylactide homogeneous (HC), pressure played a positive role on HC formation. Pressure suppressed the formation of SC network which could impede HC generation. © 2018 Wiley Periodicals, Inc. J. Appl. Polym. Sci. 2018, 135, 46378.

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Section: Introductionmentioning

confidence: 98%

Flow‐induced crystallization of polylactide stereocomplex under pressure

Song

Zhao

Yang

et al. 2018

J of Applied Polymer Sci

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“…9 In past decades, there is a growing realization that the key to address the above dilemma and achieve high-performance PLA lies in sufficient control of condensed structure, especially orientation structure. 10 Plastic deformation of SCP is an important approach to produce orientation structures. It has been widely proved that the plastic deformation of crystalline phase proceeds mainly through crystallographic slip.…”

Section: Introductionmentioning

confidence: 99%

Preparation of poly(lactic acid) with excellent comprehensive properties via simple deformation or microfibrillation of spherulites

Xiang

Fan

Shen

et al. 2021

J of Applied Polymer Sci

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Our work overcomes the long-standing challenge to achieve comprehensive improvements in thermo/mechanical properties of poly(lactic acid) (PLA), especially for impact toughness, strength, ductility, stiffness, and heat resistance. Simple deformation or microfibrillation of spherulites can create excellent thermo/mechanical properties making PLA compete against conventional petrochemical-based polymers. It was performed by pressure-induced-flow (PIF) processing, and produced typical deformed spherulite structure and brick-mud structure. It was found that the critical deformation degree of spherulites was around 2.7, beyond which spherulites would fragment. Through three transition stages of spherulite structures, deformed spherulite structures, and brick-mud structure, PLA exhibited an enhancement of orientation, storage modulus and glass transition temperature. And a substantial increase was proved in impact strength (105.6 kJ/m 2 ), tensile strength (148.4 MPa) and elongation at break (107.7%), which can be comparable to most engineering plastics. Both the deformed spherulite structures and the brick-mud structures can enhance the impact toughness of PLA by increasing the fracture path of cracks. Besides, the evolution of the microstructure for a sandwich structure during PIF-processing was proposed.

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Macromol. Rapid Commun. 9/2016

Cited by 2 publications

References 0 publications

Flow‐induced crystallization of polylactide stereocomplex under pressure

Flow‐induced crystallization of polylactide stereocomplex under pressure

Preparation of poly(lactic acid) with excellent comprehensive properties via simple deformation or microfibrillation of spherulites

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