Effects of molecular weights of bioabsorbable poly(<i>p</i>‐dioxanone) on its crystallization behaviors

Yang, Ke‐Ke; Wang, Xiuli; Wang, Yu‐Zhong; Huang, Huijie

doi:10.1002/app.23003

Cited by 21 publications

(11 citation statements)

References 22 publications

(25 reference statements)

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“…49 Additionally, the broadening band width of E g in both TiO 2-x and g-CS@TiO 2-x further proved the existence of Ti 3+ /oxygen vacancies. 50 Two characteristic peaks of g-CS@TiO 2-x were observed at approximately 1367 cm −1 and 1583 cm −1 , which are attributed to the disorder-induced D band and G band. This result proved the presence of carbon spheres in the composites (the carbon peaks were not shown in the XRD).…”

Section: Morphology and Structure Properties Tem And Sem Analysismentioning

confidence: 94%

Gentle way to build reduced titanium dioxide nanodots integrated with graphite-like carbon spheres: From DFT calculation to experimental measurement

Jiang

Wan

Wei

et al. 2017

Applied Catalysis B: Environmental

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Extending the ultraviolet response of anatase TiO 2 into visible light range and effectively decreasing the recombination rate of photo-generated carriers are vital to promote the practical applications in the fields of hydrogen generation and water pollutant treatment of TiO 2-based photocatalysts. Here we present a mild way to build composite of partial reduced TiO 2 nanodots coated graphite-like carbon spheres (g-CS@TiO 2-X) via a green solvothermal approach with relative low temperature. The chemical structure and electronic property of 3D g-CS@TiO 2-X composites have been investigated by DFT. Our DFT calculation results indicates that some mid-levels are formed between the CB and VB of TiO 2-X , which is beneficial to its visible absorption ability. The calculation results also show that bridge of Ti-O-C formed between g-CS and TiO 2-X may let the composite possesses superior charge separation property. The experimental results demonstrate that the obtained 3D g-CS@TiO 2-X can serve as an effective visible-light-driven photocatalyst for hydrogen production and organic pollutants degradation. The good visible light absorption introduced by Ti 3+ and 3D g-CS, the well-known electron transfer capability of g-CS, the matched electron structures of TiO 2-X and g-CS, and perfect interface between TiO 2-X and g-CS (Ti-O-C bridge), efficiently boost visible light photocatalytic performance via one-level electron transfer process.

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Section: Morphology and Structure Properties Tem And Sem Analysismentioning

confidence: 94%

Gentle way to build reduced titanium dioxide nanodots integrated with graphite-like carbon spheres: From DFT calculation to experimental measurement

Jiang

Wan

Wei

et al. 2017

Applied Catalysis B: Environmental

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“…Isothermal crystallization of PDO has been extensively studied by different techniques, including polarized optical microscopy and differential scanning calorimetry (DSC) [3,4,5,6,7,8]. Changes in morphological parameters have also been evaluated by small-angle X-ray scattering [9].…”

Section: Introductionmentioning

confidence: 99%

Study of Non-Isothermal Crystallization of Polydioxanone and Analysis of Morphological Changes Occurring during Heating and Cooling Processes

et al. 2016

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Non-isothermal crystallization kinetics of polydioxanone (PDO), a polymer with well-established applications as bioabsorbable monofilar suture, was investigated by Avrami, Mo, and isoconversional methodologies. Results showed Avrami exponents appearing in a relatively narrow range (i.e., between 3.76 and 2.77), which suggested a three-dimensional spherulitic growth and instantaneous nucleation at high cooling rates. The nucleation mechanism changed to sporadic at low rates, with both crystallization processes being detected in the differential scanning calorimetry (DSC) cooling traces. Formation of crystals was hindered as the material crystallized because of a decrease in the motion of molecular chains. Two secondary nucleation constants were derived from calorimetric data by applying the methodology proposed by Vyazovkin and Sbirrazzuoli through the estimation of effective activation energies. In fact, typical non-isothermal crystallization analysis based on the determination of crystal growth by optical microscopy allowed secondary nucleation constants of 3.07 × 10 5 K 2 and 1.42 × 10 5 K 2 to be estimated. Microstructure of sutures was characterized by a stacking of lamellae perpendicularly oriented to the fiber axis and the presence of interlamellar and interfibrillar amorphous regions. The latter became enhanced during heating treatments due to loss of partial chain orientation and decrease of electronic density. Degradation under various pH media revealed different macroscopic morphologies and even a distinct evolution of lamellar microstructure during subsequent heating treatments.

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“…PPDO also exhibits good mechanical performance with high tensile strength and excellent flexibility, which make it a good candidate for universal uses, such as films, molded products, laminates, foams, non‐woven materials, and adhesives. Accordingly, PPDO has attracted the interest of researchers on its synthesis,5–11 properties,12–20 and applications21, 22 in recent years. However, PPDO has no distinct advantage on mechanical strength while it compares with commercialized aliphatic polyester polylactide (PLA).…”

Section: Introductionmentioning

confidence: 99%

Modeling of the Adsorption of Organic Compounds on Polymeric Nanofiltration Membranes in Solutions Containing Two Compounds

et al. 2005

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The adsorption of organic compounds in aqueous solution on polymeric nanofiltration membranes is studied; this process is one of the most important fouling mechanisms influencing the flux and retention behavior of nanofiltration membranes. It is shown that the adsorption of dissolved organic compounds on polymeric nanofiltration membranes is comparable to that on activated carbon. Freundlich and Langmuir isotherms are used to describe the relation between the adsorbed mass on the membrane and the equilibrium concentration of the organic compound in a single-compound solution. Based on these results, three models for the adsorption of solutions containing several compounds [i.e., the simple competitive adsorption model (SCAM), the model of Jain-Snoeyinck, and the model of Butler-Ockrent] were used to predict the adsorption behavior of an organic compound in an aqueous solution containing two compounds. The results of the three models were compared to experimental observations. It is shown that the SCAM allows a good prediction of the adsorption behavior.

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Effects of molecular weights of bioabsorbable poly(p‐dioxanone) on its crystallization behaviors

Cited by 21 publications

References 22 publications

Gentle way to build reduced titanium dioxide nanodots integrated with graphite-like carbon spheres: From DFT calculation to experimental measurement

Gentle way to build reduced titanium dioxide nanodots integrated with graphite-like carbon spheres: From DFT calculation to experimental measurement

Study of Non-Isothermal Crystallization of Polydioxanone and Analysis of Morphological Changes Occurring during Heating and Cooling Processes

Modeling of the Adsorption of Organic Compounds on Polymeric Nanofiltration Membranes in Solutions Containing Two Compounds

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