Layer structure by shear-induced crystallization and thermal mechanical properties of injection-molded poly(l-lactide) with nucleating agents

Xie, Xu-Long; Sang, Zi‐Hong; Xu, Jia‐Zhuang; Zhong, Gan‐Ji; Li, Zhong‐Ming; Ji, Xu; Wang, Ruyin; Xu, Ling

doi:10.1016/j.polymer.2017.01.004

Cited by 31 publications

(19 citation statements)

References 57 publications

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“…CNTs have been used extensively to crystallize PLA; however, in processing CNTs, uniform dispersion and improved interfacial adhesion between nanotubes and the polymer matrix remain a challenge in controlling nanocomposite properties . In order to improve crystallinity in PLA, researchers have used talc and nanoclay as physical nucleating agents, while others have reported self‐nucleation by polylactide stereocomplex crystals . One limitation to the incorporation of nanofillers is that it selectively localizes in one specific phase based on its affinity within the matrix .…”

Section: Introductionmentioning

confidence: 99%

“…16 In order to improve crystallinity in PLA, researchers have used talc and nanoclay as physical nucleating agents, while others have reported self-nucleation by polylactide stereocomplex crystals. 17,18 One limitation to the incorporation of nanofillers is that it selectively localizes in one specific phase based on its affinity within the matrix. 19 Therefore, understanding the crystallinity of PLA allows for the estimation and modification of its properties.…”

Section: Introductionmentioning

confidence: 99%

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Influence of graphene nanoscrolls on the crystallization behavior and nano‐mechanical properties of polylactic acid

Ajala

Werther

Nikaeen

et al. 2019

Polymers for Advanced Techs

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Graphene nanoscrolls (GNS), one‐dimensional carbon‐based nanomaterials, have been predicted to possess extraordinary characteristics due to their unique open topology with scrolled graphene monolayers. In this study, the conversion of planar 2‐D graphene nanoplatelets (GNPs) to tubular and scrolled 1‐D GNSs is described. The effects of GNS as a nucleating agent to modulate the morphology, crystallization, and nano‐mechanical properties of polylactic acid (PLA) were studied. The nucleating effect of GNS and its unique topological characteristics proves to influence the crystallization of PLA. Fourier transform infrared (FTIR) spectroscopy indicated nonpreferential interactions of PLA chains around GNS due to the bulky and helical PLA macromolecular chains. Superior interfacial interactions and strain in GNS provide better load transfer between GNS and PLA matrices, resulting in higher modulus and hardness. This study is the first detailed analysis to elucidate the role of unique GNS to favorably modulate the properties of a polymer.

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Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Influence of graphene nanoscrolls on the crystallization behavior and nano‐mechanical properties of polylactic acid

Ajala

Werther

Nikaeen

et al. 2019

Polymers for Advanced Techs

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“…For example, Kalb et al [ 23 ], Cartier et al [ 24 ], and Su et al [ 25 ] obtained single crystals and twinned crystals in solutions, of which the crystal shape can be in lozenge or truncated form. Fibrillar crystals, on the other hand, can be formed under stressed conditions [ 26 , 27 , 28 , 29 , 30 , 31 , 32 , 33 , 34 , 35 ]. The crystallization kinetics of PLLA has also been investigated extensively.…”

Section: Introductionmentioning

confidence: 99%

Equilibrium Melting Temperature of Polymorphic Poly(l-lactide) and Its Supercooling Dependence on Growth Kinetics

Zhang

Sun

et al. 2017

Polymers

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Abstract:In this study, the isothermal crystallization process of poly(L-lactide) (PLLA) has been investigated using in situ XRD, differential scanning calorimetry (DSC), and polarized optical microscopy (POM). Linear and nonlinear extrapolation methods have been deployed to estimate the equilibrium melting temperature (T 0 m ), which is used for analyzing the supercooling dependence of the PLLA spherulitic growth rate (G). A double-melting behavior observed for PLLA under crystallization T c < 120 • C has been attributed to the formation of both α and α crystals. The

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“…Even in the A‐PLA–PBAT blend, the amorphous matrix could form a very small amount of crystallinity (∼0.5%) with a T m of around 164°C. This high capability of PLA in crystallization during the rapidly cooled IM process could have been due to the largely induced shear flow during the molding, which caused shear‐induced crystallization . The PBAT droplets also crystallized as they should have during the injection.…”

Section: Resultsmentioning

confidence: 99%

Effects of the matrix crystallinity, dispersed phase, and processing type on the morphological, thermal, and mechanical properties of polylactide‐based binary blends with poly[(butylene adipate)‐co‐terephthalate] and poly[(butylene succinate)‐co‐adipate]

Nofar

Oğuz

Ovalı

2019

J of Applied Polymer Sci

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In this study, we prepared immiscible blends of 75 wt % polylactide (PLA) with 25 wt % poly[(butylene adipate)-co-terephthalate] (PBAT) through an injection-molding (IM) process and a twin-screw extruder (TSE) followed by IM. An amorphous polylactide (A-PLA) and a semicrystalline polylactide (SC-PLA) were used as the matrixes to investigate the matrix crystallization effect on the morphology and property development of the blends with only IM. A blend of A-PLA with 25 wt % poly[(butylene succinate)-co-adipate] (PBSA) was also prepared through IM to compare its properties with those of the A-PLA-PBAT blends. The morphological, thermal, solid viscoelastic, tensile, and flexural properties of the blends were compared, and their dependency on the evolution of the blend morphology was analyzed. The tensile results show that when IM was used as the sole processing technique, the ductility and toughness were significantly improved only when SC-PLA was used as the matrix. Preprocessing through TSE also resulted in the enhancement of the blend ductility. In A-PLA-PBSA, the vitrification of PLA hindered the crystallization of PBSA to very low temperatures (<0 C) and resulted in a very nonuniform structure with weak intermolecular bonding between phases.

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Layer structure by shear-induced crystallization and thermal mechanical properties of injection-molded poly(l-lactide) with nucleating agents

Cited by 31 publications

References 57 publications

Influence of graphene nanoscrolls on the crystallization behavior and nano‐mechanical properties of polylactic acid

Influence of graphene nanoscrolls on the crystallization behavior and nano‐mechanical properties of polylactic acid

Equilibrium Melting Temperature of Polymorphic Poly(l-lactide) and Its Supercooling Dependence on Growth Kinetics

Effects of the matrix crystallinity, dispersed phase, and processing type on the morphological, thermal, and mechanical properties of polylactide‐based binary blends with poly[(butylene adipate)‐co‐terephthalate] and poly[(butylene succinate)‐co‐adipate]

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