PHBV/CSH晶须复合材料的制备、表征及3D打印性能

分别制备了半水硫酸钙(CSH)晶须和聚羟基丁酸戊酸共聚酯(PHBV)/CSH晶须复合材料,并研究了CSH晶须用量对PHBV/CSH晶须复合材料流变性能、结晶性能、力学性能和表面形貌的影响。结果表明:通过水热-盐溶液法制备的CSH是典型的α型晶须,其长度为10~15μm,宽度为1~2μm,是聚合物增强的理想材料;PHBV/CSH晶须复合材料的表观黏度分别随着温度和剪切速率的提高而逐渐下降;CSH晶须使PHBV/CSH晶须复合材料的结晶温度和结晶度明显提高,但其熔融温度有所下降。此外,CSH晶须显著改善了3D打印PHBV/CSH晶须复合支架的压缩性能,在CSH晶须用量为20%时,其压缩强度提高了3倍,增强效果显著;SEM结果显示,PHBV/CSH晶须复合材料表面随着CSH晶须用量的增加逐渐变粗糙。     

半导体激光结合红外线照射治疗促进植皮术后伤口愈合疗效观察

目的:观察半导体激光结合红外线照射治疗促进植皮术后伤口愈合的效果。方法:1.本科室植皮术后伤口不愈合患者66例,其中分成治疗组33例,对照组各33例。2.治疗组:常规换药先给予红外红照射,距离患处20～30cm,15-20min/次,1次/d。续予半导体激光治疗仪局部照射溃疡10～15min/次,1次/d,10次为1个疗程。对照组:常规消炎伤口换药。评估:治疗10天后采用肉眼观察创面分级发。结果:治疗组治愈33例显效33例。有效率为100%。对照组治疗33例,显效21例,无效12例,有效率为64%.两组差异有显著性,结论:红外红治疗仪+半导体激光治疗仪辅助照射感染伤口和溃疡,能明显促进伤口或溃疡愈合。     

元宝枫籽油的制备、功效及其应用概述

元宝枫籽油作为我国的新资源食品,因富含油酸、亚油酸和神经酸等成分,营养价值与药用保健效果突出,日益受到产业和消费者的重视。近年来,元宝枫籽油新的制备和应用开发技术不断呈现,其不仅被开发为食品,相继出现了元宝枫籽油调味品、复合乳制品、压片糖果等,还被应用到了日用化工、医疗保健等领域。综述了现有元宝枫籽油在制备、功效评价和产业应用方面的研究进展,及发展中存在的问题,并针对这些问题提出建议措施,以期促进元宝枫籽油产业的高质量发展。     

Reversible aggregation kinetics of poly(N-isopropylacrylamide-co-N-vinylpyrrolidone) in aqueous solutions revealed by elastic light scattering spectroscopy

Poly(N-isopropylacrylamide-co-N-vinylpyrrolidone) [P(NIPAM-co-NVP)] copolymers with different content of N-vinylpyrrolidone (NVP) were synthesized, and reversible aggregation kinetics of the copolymers in aqueous solutions was investigated with elastic light scattering (ELS) spectra. The results indicated that the apparent activation energy of aggregation process during heating and dissociation process during cooling increased with the NVP content increasing. The phase transition temperature also increased as the content of NVP increased, suggesting that the hydrophilic nature of NVP strongly affected the phase behavior of the copolymer solutions. The higher the content of NVP, the higher the temperature required to break the balance between the hydrophilic and hydrophobic interaction. Besides, during heating and cooling process, the phase transition hysteresis of P(NIPAM-co-NVP) chains decreased when the hydrophilic comonomer increased.