Strong and biocompatible lignin /poly (3-hydroxybutyrate) composite nanofibers

In this study, we proposed lignin copolymers as mechanical reinforcement agents for PHB. A series of lignin copolymers (random and block) were synthesized via the solvent free ring-opening polymerization (ROP) of β-butyrolactone and/or ε-caprolactone onto lignin core. The lignin copolymers were characterized by nuclear magnetic resonance (NMR), gel permeation chromatography (GPC) and differential scanning calorimetry (DSC). Next, these lignin copolymers were incorporated into PHB nanofibers as reinforcement fillers, in order to improve their mechanical properties. It is found that the lignin block copolymer with poly(ε-caprolactone) (PCL) segment followed by PHB segment (LPC + H) displayed the best mechanical improvement. Tensile strength of PHB nanofibers enhanced from 1.81 MPa to 3.13 MPa, and elongation at break increased from 15% of 55%. In the reinforced system, lignin plays as a rigid core, PCL acts a rubbery layer and PHB segment forms strong bonding with fiber matrix. Moreover, PHB/lignin nanofibers were demonstrated with superior biodegradability and biocompatibility, indicating that the new nanofibrous system holds great potential for biomedical applications. Graphical abstract
Source: Composites Science and Technology - Category: Science Source Type: research

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Hospitals exist to take care of sick people, with the goal of making them better.  Hospitals employ and work with health care professionals, again who are sworn to put taking care of patients ahead of all other concerns.However, since we foundedHealth Care Renewal, we have noted striking examples of hospital leaders threatening their hospitals'fundamental mission and/or health care professionals'core values, which we dubbedmission-hostile management.  We also saw mission-hostile management affecting the broader health care industry, particularly pharmaceutical and device companies.  Most recently, the most s...
Source: Health Care Renewal - Category: Health Management Tags: hospitals imperial CEO managerialism mission-hostile management perverse incentives Source Type: blogs
Discussion Intrauterine growth retardation or fetal growth retardation is due to a pathological process that causes decelerated fetal growth velocity. Small-for-gestational age (SGA) is an infant with growth parameters below the normal range for gestational age. More commonly, SGA is defined as a birth weight
Source: PediatricEducation.org - Category: Pediatrics Authors: Tags: Uncategorized Source Type: news
ConclusionsWe have found a better fusion rate and prevalence of fusion in the group treated with metal cages, reflecting the well-known osteoinductive properties of titanium and tantalum.
Source: Musculoskeletal Surgery - Category: Orthopaedics Source Type: research
AbstractA CT system with a tablet as mobile user interface and a wireless remote control for positioning and radiation release has recently been presented. Our aim was to evaluate the effects of a mobile CT examination workflow on the radiographers ’ performance compared to conventional examinations. A prototype of a radiation protection cabin was installed besides the gantry of a CT system. The CT system was equipped with a simplified user interface on a portable tablet and a mobile remote control. 98 patients with an indication for CT of t he chest were randomly assigned to examination using the mobile devices (stu...
Source: Journal of Medical Systems - Category: Information Technology Source Type: research
ng Yang A new tetraphenylethylene (TPE) functionalized 1,4-dihydropyrrolo[3,2-b]pyrrole derivative (APPTPECN) was synthesized with obvious aggregation-induced emission (AIE) active by simple synthetic method. APPTPECN exhibited reversible mechanofluorochromic (MFC) behavior. The powder X-ray diffraction (PXRD) and scanning electron microscopy (SEM) investigations exhibited that the MFC nature is originated through a conversion from the microcrystalline to amorphous phase under the stimulus of external force. The results obtained would be of major help in understanding the MFC mechanism and designing new MFC materials. ...
Source: Molecules - Category: Chemistry Authors: Tags: Article Source Type: research
In conclusion, three-dimensional images of the pulmonary vasculature can be created using 21 mL (including 6 mL for the test injection) of contrast medium.
Source: Radiological Physics and Technology - Category: Physics Source Type: research
ConclusionGMH should also be suspected in patients with juvenile onset of seizures, cognitive decline, and neurological deficits. Magnetic resonance scans may show lesions in the white matter of the brain with signals similar to the normal gray matter.
Source: Neurological Sciences - Category: Neurology Source Type: research
In this study, the slide wear characteristics and the coefficient of friction of HDPE (high density polyethylene) containing bi-directional silk fiber (SF) composites at two levels of nanoclay (0.5 and 1.%NC) are experimentally investigated using pin on disc setup for three sliding distance. It is observed from slide wear data that increasing the sliding distance, the weight loss increases for pure HDPE, pure HDPE+SF, pure HDPE+SF+0.5%NC and pure HDPE+SF +1%NC of the load application of 10N,20N,30N respectively. Also among four samples studied, the pure HDPE+SF +1%NC shows the least weight loss and pure HDPE shows highest....
Source: Materials Today: Proceedings - Category: Materials Science Source Type: research
Publication date: 2018Source: Materials Today: Proceedings, Volume 5, Issue 11, Part 3Author(s): S. Muzzamil Ahamed, S.G. Rakesh, Y. Vijaya Kumar, B. Mahboob Tabrez, V. Bharat, Mohammed ZakaullaAbstractThe presentation in this paper briefs the experimental results obtained for evaluating the hardness and comparing with its microstructural pattern. Mild steel chills (MSC) are used to check the chilling effect. The results show that chill position influences the hardness of cast iron. Increase in hardness is observed by placing MSC at different locations. Specimens were prepared for microstructural examination using scanning...
Source: Materials Today: Proceedings - Category: Materials Science Source Type: research
In this study, PP/Nylon 6 blend ratio was maintained at 70/30. In addition to the compatibilizer, carboxylic acid functionalized multi walled carbon nanotubes (MWCNT) were added to the blend. The polymer blend prepared by twin screw extrusion was converted into test samples by injection moulding. The microstructure development of the blends was characterized by scanning electron microscopy (SEM) and fourier transform infrared spectroscopy (FTIR) techniques. The mechanical and thermal properties of the blends were studied using tensile test and differential scanning calorimetry (DSC) respectively. The effective dispersion o...
Source: Materials Today: Proceedings - Category: Materials Science Source Type: research
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