Mechanical and thermal property characterization of poly- l -lactide (PLLA) scaffold developed using pressure-controllable green foaming technology

Sheng, Shenjun; Hu, Xiao; Wang, Fang; Ma, Qingyu; Gu, Mingyuan

doi:10.1016/j.msec.2015.01.025

Cited by 36 publications

(22 citation statements)

References 59 publications

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“…2), PLLA-based scaffolds exhibited characteristic peaks at different distinguishable vibration peak ranges, which are in accordance with previous reports (30). 2), PLLA-based scaffolds exhibited characteristic peaks at different distinguishable vibration peak ranges, which are in accordance with previous reports (30).…”

Section: Ftir Characterization Of the Scaffoldssupporting

confidence: 91%

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Hardystonite‐Coated Poly(l‐lactide) Nanofibrous Scaffold and Efficient Osteogenic Differentiation of Adipose‐Derived Mesenchymal Stem Cells

et al. 2017

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In this study, a ceramic-coated nanofibrous scaffold has been fabricated to biomimic the microstructure of natural extracellular matrix and the stiffening inorganic compartment of bone. Poly-l-lactic acid (PLLA) nanofibers were electrospun and exposed to oxygen plasma to induce hydrophilicity and promote ceramic adsorption. Hardystonite (HS), which possesses superior osteoinduction potential over hydroxyapatite, was coated on plasma-treated PLLA nanofibers by drenching the nanofibers in HS suspension. Pure and composite PLLA-based scaffolds were characterized in terms of physical and biological properties. In vitro cultivation of adipose-derived mesenchymal stem cells (AMSCs) on the scaffolds displayed that the composite scaffold is able to further support cell attachment and proliferation. In case of osteogenic differentiation of AMSCs, HS coating significantly increased the synthesis and activity of alkaline phosphate over 21 days period. In addition, the composite scaffold showed improved mineralization. The expression level of osteonectin and osteocalcin genes was significantly enhanced by HS coating of nanofibers. The biological improvement of PLLA nanofibrous matrix in the presence of HS nanoparticles could either be attributed to the release and stimulatory effect of constituent ions of HS or to the modification of chemico-physical properties of the resultant ceramic by silicon and zinc present in HS.

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Section: Ftir Characterization Of the Scaffoldssupporting

confidence: 91%

“…As assessed through FTIR (Fig. 2), PLLA-based scaffolds exhibited characteristic peaks at different distinguishable vibration peak ranges, which are in accordance with previous reports (30). C@O stretch of the carbonyl group from PLLA appeared at…”

Section: Ftir Characterization Of the Scaffoldssupporting

confidence: 89%

Hardystonite‐Coated Poly(l‐lactide) Nanofibrous Scaffold and Efficient Osteogenic Differentiation of Adipose‐Derived Mesenchymal Stem Cells

et al. 2017

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“…Hu et al [ 3 ] used temperature modulated DSC (TMDSC) to eliminate the non-reversing thermal phenomena of the sample and measure the reversing thermal properties of the silk-tropoelastin samples. Sheng et al [ 27 ] characterized the heat capacity, phase contents and transitions of PLA scaffold using SSDSC approach.…”

Section: Introductionmentioning

confidence: 99%

Exploring the Structural Transformation Mechanism of Chinese and Thailand Silk Fibroin Fibers and Formic-Acid Fabricated Silk Films

Liu

Fang

et al. 2018

IJMS

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Silk fibroin (SF) is a protein polymer derived from insects, which has unique mechanical properties and tunable biodegradation rate due to its variable structures. Here, the variability of structural, thermal, and mechanical properties of two domesticated silk films (Chinese and Thailand B. Mori) regenerated from formic acid solution, as well as their original fibers, were compared and investigated using dynamic mechanical analysis (DMA) and Fourier transform infrared spectrometry (FTIR). Four relaxation events appeared clearly during the temperature region of 25 °C to 280 °C in DMA curves, and their disorder degree (fdis) and glass transition temperature (Tg) were predicted using Group Interaction Modeling (GIM). Compared with Thai (Thailand) regenerated silks, Chin (Chinese) silks possess a lower Tg, higher fdis, and better elasticity and mechanical strength. As the calcium chloride content in the initial processing solvent increases (1%–6%), the Tg of the final SF samples gradually decrease, while their fdis increase. Besides, SF with more non-crystalline structures shows high plasticity. Two α- relaxations in the glass transition region of tan δ curve were identified due to the structural transition of silk protein. These findings provide a new perspective for the design of advanced protein biomaterials with different secondary structures, and facilitate a comprehensive understanding of the structure-property relationship of various biopolymers in the future.

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“…This difference may be attributed to the frequency effect in the DMA test, consistent with previous studies. 30,31 C. Mechanical property analysis…”

Section: B Thermal and Dynamic Mechanical Analysesmentioning

confidence: 99%

An investigation on shape memory behaviors of epoxy resin system

Wei

Liu

et al. 2015

J. Mater. Res.

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Shape-memory epoxy is receiving considerable attention because of its superior mechanical and thermal properties and excellent shape-memory performance. In this study, a novel series of shape-memory epoxy resins are prepared using hydro-epoxy, hexahydrophthalic anhydride, and diglycidyl 4,5-epoxy tetrahydro phthalate (TDE-85) to further improve the recovery force of shape-memory epoxy resins. The thermal, mechanical, and shape-memory properties of the shape-memory epoxy resin system are investigated by differential scanning calorimetry, dynamic mechanical analysis, bend test, and shape recovery test. Results indicate that the glass transition temperature (T g ), rubber modulus, and room-temperature bend strength increase as TDE-85 content increases. Investigation of the shape-memory behavior of the resin reveals that full recovery can be achieved after only several minutes when the temperature is equal to or above T g . The shape recovery time decreases with the increase in TDE-85 content at T g , T g 1 10°C, and T g 1 20°C. These results are attributed to the increase in TDE-85 content.

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Mechanical and thermal property characterization of poly- l -lactide (PLLA) scaffold developed using pressure-controllable green foaming technology

Cited by 36 publications

References 59 publications

Hardystonite‐Coated Poly(l‐lactide) Nanofibrous Scaffold and Efficient Osteogenic Differentiation of Adipose‐Derived Mesenchymal Stem Cells

Hardystonite‐Coated Poly(l‐lactide) Nanofibrous Scaffold and Efficient Osteogenic Differentiation of Adipose‐Derived Mesenchymal Stem Cells

Exploring the Structural Transformation Mechanism of Chinese and Thailand Silk Fibroin Fibers and Formic-Acid Fabricated Silk Films

An investigation on shape memory behaviors of epoxy resin system

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