Enhancing mechanical performance of polylactide by tailoring crystal morphology and lamellae orientation with the aid of nucleating agent

Bai, Hongwei; Huang, Chuanfeng; Xiu, Hao; Zhang, Qin; Fu, Qiang

doi:10.1016/j.polymer.2014.10.059

Cited by 134 publications

(82 citation statements)

References 41 publications

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“…Thus it is indeed interesting to achieve shish-kebab-like morphology of PLLA crystals free of any flow. A similar phenomenon was recently observed in PLLA/N,N 0 ,N 00 -tricyclohexyl-1,3,5-benzene-tricarboxylamide blends as well [21][22][23]. As discussed that the NA (CY) showed the highest melting temperature (360°C), it could not dissolved completely in the PLLA matrix at 145°C thus the self-organization morphology was not observed notably by POM under the same conditions.…”

Section: Self-organization Of Oxalamide Compounds In Plla Meltsupporting

confidence: 82%

“…Among above nucleating agents, the DBS could change the crystal structure of PLLA and increase the crystallization rate of PLLA through p-p interaction to form a strand with the PLLA molecules by hydrogen bonding [20]. TMC was proven with high activity which can self-organize in PLLA melt to induce fast crystallization and enhance the mechanical performance of PLLA [21,22]. Consequently, the oxygen permeability coefficient of PLLA was reduced by around 2 orders of magnitude via the addition of TMC and the crystal morphology control [23].…”

Section: Introductionmentioning

confidence: 99%

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Tailoring the crystallization behavior of poly(L-lactide) with self-assembly-type oxalamide compounds as nucleators: 1. Effect of terminal configuration of the nucleators

Shen

et al. 2015

European Polymer Journal

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Section: Self-organization Of Oxalamide Compounds In Plla Meltsupporting

confidence: 82%

Section: Introductionmentioning

confidence: 99%

Tailoring the crystallization behavior of poly(L-lactide) with self-assembly-type oxalamide compounds as nucleators: 1. Effect of terminal configuration of the nucleators

Shen

et al. 2015

European Polymer Journal

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“…A large difference in structure behavior can be seen for the PLA samples, where the amorphous structure of the as-molded sample was transformed into a highly crystalline material. The two visible diffraction peaks (110/200) and (203) at 16.8 and 19.2 • 2θ, respectively, correspond with the α-type PLA crystalline phase [63][64][65]. WAXS plots showed in Figure 15 present diffractograms for different types of prepared samples.…”

Section: Crystallinity Analysis-dsc and Waxs Measurementsmentioning

confidence: 97%

Improving the Toughness and Thermal Resistance of Polyoxymethylene/Poly(lactic acid) Blends: Evaluation of Structure–Properties Correlation for Reactive Processing

2020

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The study focuses on the development of polyoxymethylene (POM)/poly(lactic acid) (PLA) blends with increased impact and thermal resistance. The study was conducted in two phases; in the first part, a series of unmodified blends with PLA content of 25, 50, and 75 wt.% was prepared, while the second part focused on the modification of the PLA/POM (50/50) blends. An ethylene/butyl acrylate/glycidyl methacrylate terpolymer (E/BA/GMA) elastomer (EBA) was used to improve the impact strength of the prepared blends, while reactive blending was used to improve interfacial interactions. We used a multifunctional epoxy chain extender (CE) as the compatibilizer. Static tensile tests and notched Izod measurement were used to evaluate the mechanical performance of the prepared samples. The thermomechanical properties were investigated using dynamic mechanical thermal analysis (DMTA) analysis and heat deflection temperature (HDT)/Vicat softening temperature (VST) methods. The crystallinity was measured using differential scanning calorimetry (DSC) and wide-angle X-ray diffraction (WAXS) measurements, while the rheology was evaluated using a rotational rheometer. The paper also includes a structure analysis performed using the SEM method. The structural tests show partial miscibility of the POM/PLA systems, resulting in the perfect compatibility of both phases. The impact properties of the final blends modified by the EBA/CE system were found to be similar to pure POM resin, while the E modulus was visibly improved. Favorable changes were also noticeable in the case of the thermomechanical properties. The results of most of the conducted measurements and microscopic observations confirm the high efficiency of the reaction for PLA as well as for the modified POM/PLA mixtures.

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“…Because of the strong dependence of PLA macroscopic properties on its microstructure [15] and molecular dynamics [16], the cooperativity of the alpha relaxation process has been particularly investigated when the relaxation dynamics of the amorphous phase are modified by orientation [17], crystallization [13], or even plasticization [11]. However, the impact of several microstructural modifications on the amorphous phase dynamics remains unknown.…”

Section: Introductionmentioning

confidence: 99%

Molecular dynamics in electrospun amorphous plasticized polylactide fibers

Monnier

Delpouve

Basson

et al. 2015

Polymer

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is an open access repository that collects the work of Arts et Métiers ParisTech researchers and makes it freely available over the web where possible. The molecular dynamics in the amorphous phase of electrospun fibers of polylactide (PLA) has been investigated using the cooperative rearranging region concept. An unusual and significant increase of the cooperativity length at the glass transition induced by the electrospinning has been observed. This behavior is attributed to the singularity of the amorphous phase organization. Electrospun PLA fibers rearrange in a pre-ordered metastable state which is characterized by highly oriented but non-crystalline polymer chains, and the presence of highly cohesive mesophase which plays the role of an anchoring point in the amorphous phase. The successful processing of electrospun fibers of plasticized polylactide is also demonstrated. It is shown that the plasticizer remains in the polymer matrix of the nanofiber after electrospinning. When PLA is plasticized, the loosening of the macromolecules prevails over the preferential orientation of the chains; therefore no mesophase is formed during the electrospinning and the cooperativity length remains the same. When the content of plasticizer increases, the inter-chain characteristic distances estimated from wide angle X-ray scattering (WAXS) are redistributed, suggesting a change in the level of interactions between macromolecules. It is assumed that the resulting decrease of the cooperativity length is driven by the progressive reduction of the number of inter-chain weak bonds. It is shown that in a non-confined environment, the number of structural entities involved in the alpha relaxation is strongly dependent on the level of physical interactions in the amorphous phase.

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Enhancing mechanical performance of polylactide by tailoring crystal morphology and lamellae orientation with the aid of nucleating agent

Cited by 134 publications

References 41 publications

Tailoring the crystallization behavior of poly(L-lactide) with self-assembly-type oxalamide compounds as nucleators: 1. Effect of terminal configuration of the nucleators

Tailoring the crystallization behavior of poly(L-lactide) with self-assembly-type oxalamide compounds as nucleators: 1. Effect of terminal configuration of the nucleators

Improving the Toughness and Thermal Resistance of Polyoxymethylene/Poly(lactic acid) Blends: Evaluation of Structure–Properties Correlation for Reactive Processing

Molecular dynamics in electrospun amorphous plasticized polylactide fibers

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