聚合物对水泥基复合材料性能的影响

聚合物与水泥进行合理、有效地复合,开发聚合物水泥基复合材料,是研制高效节能建材的有效途径之一。通过研究不同玻璃化温度、不同pH值的聚合物对水泥基复合材料抗压、抗折强度的影响,得出玻璃化温度存在一个最佳值,碱性的聚合物改性水泥砂浆的力学性能最高。     

促蛋白复性高分子及其作用机制

概述近年来蛋白复性中所使用的高分子添加剂及各自的作用机制,为相关领域的研究者对促蛋白用高分子的选择以及新型材料的研制,提供一定的研究基础和理论依据.     

Theoretical study on constitutive relationship of fiber reinforced polymer confined concrete

We proposed a bilinearity constitutive curve model of fiber reinforced polymer （FRP） confined concrete which includes a parabola in the first stage and a straight line in the second stage. The FRP-confined concrete has powerful confinement status and weak confinement status leading to different equations of parabola. We analyzed the impacts of factors such as confinement ratio and restrain stiffness on confined concrete compressive strength, ultimate strain and other control parameters through finite element analysis. The results show that the confinement ratio determines the confinement status, and the increase of the confinement ratio has a limited capacity to increase the compressive strength, The deformation of confined concrete is influenced by restrain stiffness. The stronger the restrain stiffness is, the less the lateral deformation is and the greater ultimate axial strain will be. The consideration of equivalent section coefficient kse is needed in the non-circular section confined concrete. We analyzed the results and proposed boundary values of strong and weak confinement styles, a peak/inflection point stress and strain model, and a compressive strength and ultimate strain model.     

FT-IR光谱对共混聚合物电解质中离子缔合行为的研究

虽然PVdF几乎不与NaSCN发生溶剂化作用, 但由于PVdF可以在PEO-NaSCN 电解质中形成具有半晶相的微孔状结构,因此在电解质中加入PVdF能够降低PEO的结晶度,从而导致NaSCN的各种离子缔合成分的百分数随PVdF的含量的变化而变化,而且这种变化的程度还与电解质中NaSCN的含量有关.     

CMC聚合物对重金属离子的吸附性能

通过正交试验得出制备羧甲基纤维素(CMC)聚合物的最佳工艺条件:丙烯酸(AA)/羧甲基纤维素=10,引发剂(硫酸铵)和交联剂(N,N'-亚甲基双丙烯酰胺)用量分别为单体的0.0014倍和0.0015倍.吸胀平衡后,将CMC聚合物在400~450℃下完全灰化16h,消解并用火焰原子吸收法测定聚合物对Zn2+、Cu2+、Pb2+、Cd2+、Cr2+、Ni2+和Mn2+的吸附性能.结果表明,CMC聚合物对重金属离子具有一定的吸附能力,其吸附量随着溶液pH值和重金属离子质量浓度的增加而增大,当pH为9时达到最大;并且CMC聚合物对Pb2+和Cu2+的吸附量要大于其他金属离子.     

家具用高分子台面板成分分析方法研究

家具用高分子台面板日益广泛的用于各类家具产品,随之而来的质量问题也日益引起人们的关注,而不同物质的成分含量会直接影响台面板的质量。本文就如何选择适当的实验方法来进行成分分析进行了研究。     

有机聚合物电致发光材料研究进展

通过对目前研究较多的几种有机聚合物电致发光材料及其器件的发光性能进行了综述,说明有机电致发光材料具有轻便、柔性强、易加工等优点及广阔的应用前景。     

可生物降解材料微球的研究进展

可生物降解高分子材料具有良好的生物相容性.聚合物和降解产物对机体毒副作用小,已成为微球等新药物剂型的重要载体材料.本文主要综述了明胶、壳聚糖、聚乳酸这三种常用的可生物降解的载药微球的研究进展.     

Heteroheptacene-based acceptors with thieno[3,2-b]pyrrole yield high-performance polymer solar cells

Rationally utilizing and developing synthetic units is of particular significance for the design of high-performance non-fullerene small-molecule acceptors (SMAs). Here, a thieno[3,2-b]pyrrole synthetic unit was employed to develop a set of SMAs (ThPy1, ThPy2, ThPy3 and ThPy4) by changing the number or the position of the pyrrole ring in the central core based on a standard SMA of IT-4Cl, compared to which the four thieno[3,2-b]pyrrole-based acceptors exhibit bathochromic absorption and upshifted frontier orbital energy level due to the strong electron-donating ability of pyrrole. As a result, the polymer solar cells (PSCs) of the four thieno[3,2-b]pyrrole-based acceptors yield higher open-circuit voltage and lower energy loss relative to those of the IT-4Cl-based device. What is more, the ThPy3-based device achieves a power conversion efficiency (PCE) (15.3%) and an outstanding fill factor (FF) (0.771) that are superior to the IT-4Cl-based device (PCE = 12.6%, FF = 0.758). The ThPy4-based device realizes the lowest energy loss and the smallest optical band gap, and the ternary PSC device based on PM6:BTP-eC9:ThPy4 exhibits a PCE of 18.43% and a FF of 0.802. Overall, this work sheds light on the great potential of thieno[3,2-b]pyrrole-based SMAs in realizing low energy loss and high PCE.