Nonisothermal melt and cold crystallization behaviors of biodegradable poly(lactic acid)/Ti3C2Tx MXene nanocomposites

Zhao, Qian; Wang, Bowen; Qin, Chenyuan; Li, Qiuxuan; Liu, Chuntai; Shen, Changyu; Wang, Yaming

doi:10.1007/s10973-020-10502-7

Cited by 14 publications

(5 citation statements)

References 55 publications

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“…For the former, this peak is attributed to a melting, recrystallization and remelting (MRR) process of α′ crystals which are forming in the presence of the nanofibrils. Similar behavior has previously been observed in studies of the crystallization of PLA nanocomposites. − Intensive studies by Zhang et al and Kalish et al have used combined spectroscopic and calorimetric analyses to prove that this peak is characteristic of a solid–solid transition of α′ crystals to the more stable α polymorph. Zhang et al further demonstrated via isothermal testing that the formation of the α′ polymorph was favored only at low isothermal temperatures between 80 and 100 °C, while the α polymorph became dominant above this range .…”

Section: Resultssupporting

confidence: 68%

Generation of Tough, Stiff Polylactide Nanocomposites through the In Situ Nanofibrillation of Thermoplastic Elastomer

Anstey

Tuccitto

Lee

et al. 2022

ACS Appl. Mater. Interfaces

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Polylactide (PLA) resins are among the most desirable biopolymers due to their biobased and compostable nature, excellent stiffness, and tensile strength. However, the widespread application of PLA has long been hindered by its inherent brittleness. While multiple routes have been successfully developed for the toughening of PLA, this toughening has always come at the cost of compromising the stiffness and strength of the matrix. In this work, we report a robust and scalable method for the development of PLA nanocomposites with an unprecedented combination of stiffness and toughness. Using the in situ nanofibrillation technique, we generated PLA composites containing nanofibrils of thermoplastic polyester elastomer (TPEE). Due to the high aspect ratio of these nanofibrils, they form physically percolated networks at low weight fractions (∼2.8 wt %) which dramatically change the mechanical behavior of the material. We found that, upon network formation, the material transitions from brittle to ductile behavior, dramatically increasing its toughness with only a marginal decrease in Young's modulus. We investigate the peculiar rheological behavior and crystallization kinetics of these blends, and propose an extension of the critical ligament thickness mechanism, wherein intrinsic toughening arises at the fiber-matrix interface in the presence of entangled elastomer networks.

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Section: Resultssupporting

confidence: 68%

Generation of Tough, Stiff Polylactide Nanocomposites through the In Situ Nanofibrillation of Thermoplastic Elastomer

Anstey

Tuccitto

Lee

et al. 2022

ACS Appl. Mater. Interfaces

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“…Heterogeneous nucleation effects in nonisothermal crystallized polymer nanocomposites characterized by DSC have been discussed in the literature [59,60]. Figure 4 shows the heat flow curves of the prepared specimens in this study during cooling from 200 • C to 50 • C at rates of 2.5, 5, 7.5, and 10…”

Section: Nonisothermal Crystallization Behavior Of Pla/pbs/pbat/nha B...mentioning

confidence: 76%

Bio-Based PLA/PBS/PBAT Ternary Blends with Added Nanohydroxyapatite: A Thermal, Physical, and Mechanical Study

Chen,

Mao

et al. 2023

Polymers

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The physical and mechanical properties of novel bio-based polymer blends of polylactic acid (PLA), poly(butylene succinate) (PBS), and poly (butylene adipate-co-terephthalate) (PBAT) with various added amounts of nanohydroxyapatite (nHA) were investigated in this study. The formulations of PLA/PBS/PBAT/nHA blends were divided into two series, A and B, containing 70 or 80 wt% PLA, respectively. Samples of four specimens per series were prepared using a twin-screw extruder, and different amounts of nHA were added to meet the regeneration needs of bone graft materials. FTIR and XRD analyses were employed to identify the presence of each polymer and nHA in the various blends. The crystallization behavior of these blends was examined using DSC. Tensile and impact strength tests were performed on all samples to screen feasible formulations of polymer blends for bone graft material applications. Surface morphology analyses were conducted using SEM, and the dispersion of nHA particles in the blends was further tested using TEM. The added nHA also served as a nucleating agent aimed at improving the crystallinity and mechanical properties of the blends. Through the above analyses, the physical and mechanical properties of the polymer blends are reported and the most promising bone graft material formulations are suggested. All blends were tested for thermal degradation analysis using TGA and thermal stability was confirmed. The water absorption experiments carried out in this study showed that the addition of nHA could improve the hydrophilicity of the blends.

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“…NA provides numerous nucleating sites for polymer crystallization and reduces the surface free energy barrier for nucleation, which significantly accelerates the crystallization and increases the crystallization temperature of PLA. , There are three types of NAs usually used to control the crystallinity of PLA: inorganic NA, organic NA, and macromolecular NA. Inorganic NAs, such as calcium carbonate, silica, montmorillonite, talc, boron nitride nanotubes, and Ti 3 C 2 T x MXene have abundant resources and are low in cost. However, due to the poor compatibility between inorganic NA and PLA matrix, the incorporation of inorganic NA usually reduces the mechanical properties of PLA.…”

Section: Introductionmentioning

confidence: 99%

“…16,17 There are three types of NAs usually used to control the crystallinity of PLA: inorganic NA, organic NA, and macromolecular NA. Inorganic NAs, such as calcium carbonate, 18 silica, 19 montmorillonite, 20 talc, 21 boron nitride nanotubes, 22 and Ti 3 C 2 T x MXene 23 have abundant resources and are low in cost. However, due to the poor compatibility between inorganic NA and PLA matrix, the incorporation of inorganic NA usually reduces the mechanical properties of PLA.…”

Section: Introductionmentioning

confidence: 99%

Effect of a Self-Assembled Nucleating Agent on the Crystallization Behavior and Spherulitic Morphology of Poly(lactic acid)

Yan,

Huang,

Zhao

et al. 2023

ACS Omega

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Nonisothermal melt and cold crystallization behaviors of biodegradable poly(lactic acid)/Ti3C2Tx MXene nanocomposites

Cited by 14 publications

References 55 publications

Generation of Tough, Stiff Polylactide Nanocomposites through the In Situ Nanofibrillation of Thermoplastic Elastomer

Generation of Tough, Stiff Polylactide Nanocomposites through the In Situ Nanofibrillation of Thermoplastic Elastomer

Bio-Based PLA/PBS/PBAT Ternary Blends with Added Nanohydroxyapatite: A Thermal, Physical, and Mechanical Study

Effect of a Self-Assembled Nucleating Agent on the Crystallization Behavior and Spherulitic Morphology of Poly(lactic acid)

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