It was found that air dielectric barrier discharge(DBD) plasma contributed to the grafting of epoxy resin onto continuous PBO fiber surface. This air-plasma-grafting-epoxy method yielded a noticeable enhancement in th...It was found that air dielectric barrier discharge(DBD) plasma contributed to the grafting of epoxy resin onto continuous PBO fiber surface. This air-plasma-grafting-epoxy method yielded a noticeable enhancement in the interfacial adhesion between PBO fiber and thermoplastic matrix resin, with the interlaminar shear strength of the resulting composites increased by 66.7%. DSC and FTIR analyses were then used to study the curing behavior of epoxy coating on PBO fiber surface, deduce the possible grafting reactions and investigate the grafting mechanism. More importantly, TGA measurement showed that the grafting of epoxy onto PBO fiber had almost no effect on the composite heat resistance, and there was more thermoplastic matrix resin adhering to the fiber surface; the latter could also be clearly found in the SEM photos. Thereby, the air-plasma-grafting-epoxy treatment was proved to be an effective method for the improvement of continuous PBO fiber surface adhesive properties.展开更多
Background Recent studies have shown that the mortality of patients with coronary artery bypass grafting(CABG)can be reduced by ticagrelor,but the effect on the vascular patency of the bridge and other cardiovascular ...Background Recent studies have shown that the mortality of patients with coronary artery bypass grafting(CABG)can be reduced by ticagrelor,but the effect on the vascular patency of the bridge and other cardiovascular events is not clear.Methods A database of patients with coronary artery bypass grafting in our hospital from October 2013 to December 2016,40 patients with ticagrelor and aspirin after the surgery.展开更多
Low density polyethylene film surface-grafted resorcinol was prepared by a sequential process.Firstly, acrylic acid was grafted to the surface of low density polyethylene by UV photo-grafting.Secondly, the carboxylic ...Low density polyethylene film surface-grafted resorcinol was prepared by a sequential process.Firstly, acrylic acid was grafted to the surface of low density polyethylene by UV photo-grafting.Secondly, the carboxylic groups in poly（acrylic acid） chains were transferred to acyl chloride groups by the reaction of carboxylic groups with thionyl chloride.The stability of acyl chloride groups in several solvents（alcohol, water, acetone, aqueous NaOH and in N2 atmosphere） was investigated, and N2 atmosphere and acetone were appropriate media to protect acyl chloride groups from side reaction.Finally, resorcinol monomer reacted with acyl chloride to append to the poly（acrylic acid）chains at room temperature.FT-IR-ATR was used to characterize the change of carbonyl groups during each step of the grafting process.Furthermore, by the experimental data of gravimetric analysis the grafted resorcinol monomer on the surface of low density polyethylene film was verified to have undergone condensation with acetone further in the resorcinol/acetone solution at 56℃, which might be a useful feature for synthesizing a thermoplastic/thermosetting composition.展开更多
Objective:While age has been recognized as a noteworthy factor in preoperative graft selection,the correlation between age and hamstring autograft diameter has been the subject of continued debate within the scientifi...Objective:While age has been recognized as a noteworthy factor in preoperative graft selection,the correlation between age and hamstring autograft diameter has been the subject of continued debate within the scientific community.This study aimed to explore the correlation between the diameter of autologous tendon grafts and age in anterior cruciate ligament reconstruction(ACLR).Methods:A retrospective review of 388 patients who underwent arthroscopic ACLR with hamstring autografts was performed.Patients were grouped by age to analyze differences in hamstring autograft dia-meter and tendon cross-sectional area(CSA).We explored the correlations between age and graft diameter and between age and the CSA of the popliteal tendon while controlling for the influence of other pertinent variables.Results:Compared with female patients,male patients presented significantly greater autograft diameters and hamstring tendon CSAs(P<0.05).Notably,graft diameter and hamstring tendon CSA varied significantly across different age groups(P<0.05);patients aged>32 years were substantially more likely to have a graft diameter exceeding 8 mm and a CSA surpassing 18.5 mm^(2) than their≤32-year-old counterparts were(P<0.05).Conclusion:This study revealed that graft diameter varies across different age groups,with age independently influencing graft diameter.展开更多
基金Project(L2014056)supported by the Liaoning Education Department,ChinaProject(201501089)supported by the Dr.Start-up Fund of Liaoning Province,China
文摘It was found that air dielectric barrier discharge(DBD) plasma contributed to the grafting of epoxy resin onto continuous PBO fiber surface. This air-plasma-grafting-epoxy method yielded a noticeable enhancement in the interfacial adhesion between PBO fiber and thermoplastic matrix resin, with the interlaminar shear strength of the resulting composites increased by 66.7%. DSC and FTIR analyses were then used to study the curing behavior of epoxy coating on PBO fiber surface, deduce the possible grafting reactions and investigate the grafting mechanism. More importantly, TGA measurement showed that the grafting of epoxy onto PBO fiber had almost no effect on the composite heat resistance, and there was more thermoplastic matrix resin adhering to the fiber surface; the latter could also be clearly found in the SEM photos. Thereby, the air-plasma-grafting-epoxy treatment was proved to be an effective method for the improvement of continuous PBO fiber surface adhesive properties.
文摘Background Recent studies have shown that the mortality of patients with coronary artery bypass grafting(CABG)can be reduced by ticagrelor,but the effect on the vascular patency of the bridge and other cardiovascular events is not clear.Methods A database of patients with coronary artery bypass grafting in our hospital from October 2013 to December 2016,40 patients with ticagrelor and aspirin after the surgery.
文摘Low density polyethylene film surface-grafted resorcinol was prepared by a sequential process.Firstly, acrylic acid was grafted to the surface of low density polyethylene by UV photo-grafting.Secondly, the carboxylic groups in poly（acrylic acid） chains were transferred to acyl chloride groups by the reaction of carboxylic groups with thionyl chloride.The stability of acyl chloride groups in several solvents（alcohol, water, acetone, aqueous NaOH and in N2 atmosphere） was investigated, and N2 atmosphere and acetone were appropriate media to protect acyl chloride groups from side reaction.Finally, resorcinol monomer reacted with acyl chloride to append to the poly（acrylic acid）chains at room temperature.FT-IR-ATR was used to characterize the change of carbonyl groups during each step of the grafting process.Furthermore, by the experimental data of gravimetric analysis the grafted resorcinol monomer on the surface of low density polyethylene film was verified to have undergone condensation with acetone further in the resorcinol/acetone solution at 56℃, which might be a useful feature for synthesizing a thermoplastic/thermosetting composition.
基金This work was supported by the Fundamental Research Funds for the Central Universities(WK9110000143)the USTC Research Funds of the Double First-Class Initiative(YD9110002060)the Health Research Program of Anhui(AHWJ2022b060)。
文摘Objective:While age has been recognized as a noteworthy factor in preoperative graft selection,the correlation between age and hamstring autograft diameter has been the subject of continued debate within the scientific community.This study aimed to explore the correlation between the diameter of autologous tendon grafts and age in anterior cruciate ligament reconstruction(ACLR).Methods:A retrospective review of 388 patients who underwent arthroscopic ACLR with hamstring autografts was performed.Patients were grouped by age to analyze differences in hamstring autograft dia-meter and tendon cross-sectional area(CSA).We explored the correlations between age and graft diameter and between age and the CSA of the popliteal tendon while controlling for the influence of other pertinent variables.Results:Compared with female patients,male patients presented significantly greater autograft diameters and hamstring tendon CSAs(P<0.05).Notably,graft diameter and hamstring tendon CSA varied significantly across different age groups(P<0.05);patients aged>32 years were substantially more likely to have a graft diameter exceeding 8 mm and a CSA surpassing 18.5 mm^(2) than their≤32-year-old counterparts were(P<0.05).Conclusion:This study revealed that graft diameter varies across different age groups,with age independently influencing graft diameter.
