Performance and crystallization kinetics of poly (L‐lactic acid) toughened by poly (D‐lactic acid)

Song, Zhongbo; Zhen, Weijun

doi:10.1002/adv.21816

Cited by 7 publications

(2 citation statements)

References 42 publications

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“…Self-blending of PLLA with PDLA is known to enhance the general crystallinity of the resulting materials [271][272][273][274][275][276][277] . The resulting stereo complex crystals have higher heat resistance and those blends are reported to maintain their transparency T380-780 >75 % [271][272][273][274][275][276][277] . However, optical properties under thermal influences are still under investigation.…”

Section: Blendsmentioning

confidence: 99%

Assessment of Polylactide as Optical Material

Kesting

Meyer

Seide

2023

Preprint

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Due to environmental concerns, interest in bioplastics is rising. For optical applications, materials have to meet high requirements. Polylactide (PLA), a known bioplastic, is already applied in high tech applications such as medicine. The material shows favorable optical properties and excellent resistance against photodegradation. However, the material turns hazy due to crystallization when exposed to temperatures above 55-60 °C. This renders it useless for optical applications. Clouding might be avoided by influencing PLA’s crystallization behavior. In this critical review the broad use of PLA is discussed. It is also shown, that currently no material is commercially available that meets all requirements set while being biodegradable and exclusively based on renewable feedstocks. Finally, an overview of the current state in research is provided, considering PLA-based materials with adapted crystallization behavior under the aspect of transparency. At last, recommendations for the goal of achieving highly sustainable PLA-based optical components are given.

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Section: Blendsmentioning

confidence: 99%

Assessment of Polylactide as Optical Material

Kesting

Meyer

Seide

2023

Preprint

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“…Poly (lactic acid) (PLA) is one kind of biodegradable [4] and biocompatible thermoplastic that is fermented from renewable resources. PLA can be completely decomposed into environmentalfriendly CO 2 and H 2 O under the condition of composting, so its characteristics have attracted much attention in the research of polymer materials [5][6][7][8][9]. Since the lactic acid molecule has an asymmetric carbon atom, it has optical rotation.…”

Section: Introductionmentioning

confidence: 99%

Synthesis of Graphene Oxide-Polystyrene Graft Polymer Based on Reversible Addition Fragmentation Chain Transfer and Its Effect on Properties, Crystallization, and Rheological Behavior of Poly (Lactic Acid)

Yang

Zhen

2020

Advances in Polymer Technology

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Graphene oxide-polystyrene graft polymer (SGO-PS) was prepared by reversible addition-fragmentation chain transfer radical polymerization method. Orthogonal experiments indicated that the optimum synthesis reaction conditions for SGO-PS were as follows: the millimole ratio of chain transfer agent to initiator was 0.15 : 0.3, and the amount of styrene was 8 mL at 80°C for 12 hours. The products were characterized by Fourier transform infrared spectroscopy and thermal weightlessness analysis, and the highest grafting rate of SGO-PS was 62.46%. Then, PLA/SGO-PS nanocomposites were prepared using SGO-PS as fillers by melt intercalation method, and its crystallinity, mechanical properties, and thermal stability were significantly improved. Compared with pure PLA, the crystallinity of PLA/SGO-PS (0.3 wt%) nanocomposites was increased by 5 times. Multiple melting behavior tests showed that the introduction of SGO-PS caused the PLA molecular chain to be discharged into the unit cell in time, and the melting temperature shifted to a higher temperature, which ultimately made the grain structure of PLA composites more complete and stable than pure PLA. The rheological performance test showed that the uniform dispersion of SGO-PS in the PLA matrix inhibited the free movement of the PLA molecular chain and caused higher flow resistance, resulting in an increase in the complex viscosity, storage modulus, and loss modulus of PLA/SGO-PS.

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Enhancing crystallization behavior for optimized performances of poly(TMC‐b‐(LLA‐ran‐GA)) by PDLA/PLLA stereocomplex crystallization

Fan

Qin

Lin

et al. 2020

Polymers for Advanced Techs

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The blends of poly(1,3‐trimethylene carbonate‐b‐(l‐lactide‐ran‐glycolide)) (PTLG) with poly(d‐lactide) (PDLA) were prepared via solution‐casting method using CH2Cl2 as solvent. The poly(l‐lactide) (PLLA) segments of PTLG with PDLA chain constructed as stereocomplex structures and growth stereocomplex crystals of PLA (sc‐PLA). The effects of sc‐PLA crystals on thermal behavior, mechanical properties, thermal decomposition of the PTLG/PDLA blends were investigated, respectively. The differential scanning calorimetry (DSC) and wide‐angle X‐ray diffraction (WAXD) results showed that the total crystallinity of the PTLG/PDLA blends was increased with the PDLA content increasing. Heterogeneous nucleation of sc‐PLA crystals induced crystallization of the PLLA segments in PTLG. The crystallization temperature of samples shifted to 107.5°C for the PTLG/PDLA‐20 blends compared with that of the PTLG matrix, and decreased the half‐time of crystallization. The mechanical measurement results indicated that the tensile strength of the PTLG/PDLA blends was improved from 21.1 MPa of the PTLG matrix to 39.5 MPa of PTLG/PDLA‐20 blends. The results of kinetics of thermal decomposition of the PTLG/PDLA blends by TGA showed that the apparent activation energy of the PTLG/PDLA blends was increased from 59.1 to 72.1 kJ/mol with the increasing of the PDLA content from 3 wt% to 20 wt%, which indicated the enhancement of thermal stability of the PTLG/PDLA blends by addition of PDLA. Furthermore, the biocompatibility of the PTLG/PDLA blends cultured with human adipose‐derived stem cells was evaluated by CCK‐8 and live/dead staining. The experiment results proved the PTLG/PDLA blends were a kind of biomaterial with excellent physical performances with very low cytotoxicity.

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Performance and crystallization kinetics of poly (L‐lactic acid) toughened by poly (D‐lactic acid)

Cited by 7 publications

References 42 publications

Assessment of Polylactide as Optical Material

Assessment of Polylactide as Optical Material

Synthesis of Graphene Oxide-Polystyrene Graft Polymer Based on Reversible Addition Fragmentation Chain Transfer and Its Effect on Properties, Crystallization, and Rheological Behavior of Poly (Lactic Acid)

Enhancing crystallization behavior for optimized performances of poly(TMC‐b‐(LLA‐ran‐GA)) by PDLA/PLLA stereocomplex crystallization

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