The Effect of Cellulose Nanocrystals and Acetylated Nanocellulose on the Crystallization Kinetics and Thermal Stability of Polylactic Acid

Fang, Minggang; Luo, Chunyan; Guo, Xiaohong; Sun, Jianxin; Chen, Ming‐Yuan; Chen, Weixing

doi:10.1134/s0965545x22700523

Cited by 3 publications

(2 citation statements)

References 41 publications

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“…15,16 In blends, the most significant mechanical property enhancements most often require reactive 17−24 or nonreactive compatibilization. 25−30 In other approaches without adding rubber, polymer-grafted cellulose nanocrystals have garnered attention as crystal nucleators 31,32 and tougheners. 33−35 Amphiphilic non-PLA diblock polymers have also conferred toughness and aging resistance to atactic PLA, 36−39 as well as toughness and accelerated crystallization to semicrystalline PLLA.…”

Section: ■ Introductionmentioning

confidence: 99%

“…Efforts to simultaneously upgrade PLLA’s thermal and mechanical properties have spawned a rich subfield. Melt-blending with rubbery polymers is the most well-explored approach, owing to the low cost of bulk rubber, translatability to existing melt-processing capabilities, and property tunability under a wide parameter space. , In blends, the most significant mechanical property enhancements most often require reactive − or nonreactive compatibilization. − In other approaches without adding rubber, polymer-grafted cellulose nanocrystals have garnered attention as crystal nucleators , and tougheners. − Amphiphilic non-PLA diblock polymers have also conferred toughness and aging resistance to atactic PLA, − as well as toughness and accelerated crystallization to semicrystalline PLLA. , Finally, thermomechanical preconditioning of PLLA − and its composites can produce highly oriented matrices with improved strength, ductility, and thermal resistance.…”

Section: Introductionmentioning

confidence: 99%

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Crystallinity-Independent Toughness in Renewable Poly(l-lactide) Triblock Plastics

Krajovic,

Haugstad,

Hillmyer

2024

Macromolecules

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Poly(L-lactide) (PLLA)'s broad applicability is hindered by its brittleness and slow crystallization kinetics. Among the strategies for developing tough, thermally resilient PLLA-based materials, the utilization of neat PLLA block polymers has received comparatively little attention, despite its attractive technological merits. In this work, we comprehensively describe the microstructural, thermal, and mechanical properties of two compositional libraries of PLLA-rich PLLA-b-poly(γ-methyl-εcaprolactone) (PγMCL)-b-PLLA ("LML") triblock copolymers. Rubbery PγMCL domains microphase separate from the matrix in the melt and intercalate between PLLA crystal lamellae on cooling. Despite the mobility constraints associated with midblock tethering, the PLLA end-blocks crystallize as rapidly as a PLLA homopolymer control of similar molar mass. Independent of their degree of crystallinity, LML triblocks exhibit vastly improved tensile toughnesses (63−113 MJ m −3 ) over that of PLLA homopolymer (1.3−2 MJ m −3 ), with crystallinities of up to 55% and heat distortion temperatures (HDTs) as high as 148 °C. We investigated the microstructural origins of this appealing performance using X-ray scattering and microscopy. In the case of a largely amorphous PLLA matrix, the PγMCL domains cavitate to enable concurrent PLLA shear yielding and strain-induced crystallization. In highly crystalline PLLA matrices, PγMCL facilitates a lamellar-to-fibrillar transition during tensile deformation, the first such transition reported for PLLA drawn at room temperature. These results highlight the unique attributes of PLLA block polymers and prompt future architectural and processing optimizations to achieve ultratough, high-HDT PLLA block polymer plastics after a simple thermal history on economical time scales.

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Section: ■ Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Crystallinity-Independent Toughness in Renewable Poly(l-lactide) Triblock Plastics

Krajovic,

Haugstad,

Hillmyer

2024

Macromolecules

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Biocomposites and bionanocomposites from poly(lactide) and cellulosic materials – a review

Nkuna,

Mhike,

Ojijo

et al. 2024

Cellulose

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Global environmental concerns have recently accelerated interest in the usage of biodegradable polymers to replace petroleum-based conventional plastics. Lactic acid-based polymers are some of the most promising and widely studied biobased materials, which are suitable for packaging and biomedical applications. This is mainly due to their appealing characteristics such as relatively good mechanical properties, biocompatibility, and multiple end-of-life options such as recyclability and biodegradability in industrial composting conditions. However, the use of lactic acid-based polymers in advanced applications is constrained by their inherent brittleness, poor melt strength, and relatively high cost. These disadvantages can be remedied by reinforcement with cellulose nanomaterials which can enhance their mechanical properties while maintaining their biodegradability. This review provides an overview of recent studies on the development of biodegradable lactic acid-based polymer composites and nanocomposites reinforced with cellulose nanofibrils (CNFs), cellulose nanocrystals (CNCs) and microcrystalline cellulose (MCC). The different processing methods and chemical modification techniques utilised on modification and functionalisation of cellulosic nanomaterials for improving the properties of lactic acid-based polymer nanocomposites are also discussed.

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Enhancing mechanical and thermal properties of plasticized poly-L-(lactic acid) by incorporating aminated-cellulose nanocrystals

Aouay

Magnin

Putaux

et al. 2023

Industrial Crops and Products

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The Effect of Cellulose Nanocrystals and Acetylated Nanocellulose on the Crystallization Kinetics and Thermal Stability of Polylactic Acid

Cited by 3 publications

References 41 publications

Crystallinity-Independent Toughness in Renewable Poly(l-lactide) Triblock Plastics

Crystallinity-Independent Toughness in Renewable Poly(l-lactide) Triblock Plastics

Biocomposites and bionanocomposites from poly(lactide) and cellulosic materials – a review

Enhancing mechanical and thermal properties of plasticized poly-L-(lactic acid) by incorporating aminated-cellulose nanocrystals

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