我国塑料用荧光增白剂市场现状

荧光增白剂用于白色塑料制品可显著改善产品外观的白度和光亮度,提高其商业价值。本文介绍了我国已生产的用于塑料领域荧光增白剂主要有双苯并(?)唑类型、二苯乙烯基苯类型及二苯乙烯基联苯类型共8个品种,并列出了国内主要生产企业。我国的塑料用荧光增白剂行业尚存在重复建设严重的现象,整个行业处于小、散、低的水平;科技投入少,发展后劲不足;产品标准化工作滞后;市场开发和服务需进一步加强。     

炭黑和白炭黑填充硫化胶的湿摩擦差异性分析

研究不同负荷和速度下炭黑和白炭黑填充硫化胶的湿摩擦因数,并对其摩损表面进行了扫描电子显微镜和透射电镜表征。结果表明：炭黑填充硫化胶的湿摩擦因数随着速度的增大呈线性下降,随着负荷的增大略有降低,而白炭黑填充硫化胶的湿摩擦因数随着速度的增大呈非线性下降,随着负荷的增大先迅速下降后缓慢降低;白炭黑填充硫化胶摩擦面橡胶膜较薄,裸露白炭黑粒子,过渡区摩擦力较大,不能忽略;炭黑填充硫化胶表面的橡胶膜厚度较大,表面炭黑粒子被橡胶大分子覆盖,过渡区摩擦力小,可以忽略。     

钛酸丁酯、负载钛/复合铝体系引发异戊二烯聚合

以钛酸丁酯、负载钛/复合铝(AlEt3/Al(i-Bu)3)组成的双组分钛催化体系引发异戊二烯(Ip)聚合,研究了n(AlEt3):n(Al(i-Bu)3)对聚合活性和特性黏数的影响。对聚合物进行溶解分离得到汽油可溶物和不可溶物,分别对汽油可溶物进行红外并且定量分析,对汽油不可溶物进行红外和DSC分析。结果显示,汽油不可溶物部分为反式-1,4-聚异戊二烯,汽油可溶物部分为3,4-聚异戊二烯,且3,4-结构含量及汽油可溶物的特性黏数随着AlEt3比例的提高而升高,而反式-1,4-聚异戊二烯的特性黏数则随着AlEt3量增加而下降。     

Polymer‐Passivated Inorganic Cesium Lead Mixed‐Halide Perovskites for Stable and Efficient Solar Cells with High Open‐Circuit Voltage over 1.3 V

Cesium‐based trihalide perovskites have been demonstrated as promising light absorbers for photovoltaic applications due to their superb composition stability. However, the large energy losses (E_loss) observed in inorganic perovskite solar cells has become a major hindrance impairing the ultimate efficiency. Here, an effective and reproducible method of modifying the interface between a CsPbI₂Br absorber and polythiophene hole‐acceptor to minimize the E_loss is reported. It is demonstrated that polythiophene, deposited on the top of CsPbI₂Br, can significantly reduce electron‐hole recombination within the perovskite, which is due to the electronic passivation of surface defect states. In addition, the interfacial properties are improved by a simple annealing process, leading to significantly reduced energy disorder in polythiophene and enhanced hole‐injection into the hole‐acceptor. Consequently, one of the highest power conversion efficiency (PCE) of 12.02% from a reverse scan in inorganic mixed‐halide perovskite solar cells is obtained. Modifying the perovskite films with annealing polythiophene enables an open‐circuit voltage (V_OC) of up to 1.32 V and E_loss of down to 0.5 eV, which both are the optimal values reported among cesium‐lead mixed‐halide perovskite solar cells to date. This method provides a new route to further improve the efficiency of perovskite solar cells by minimizing the E_loss.     

提高600t混铁炉炉龄的措施

结合莱钢炼钢厂６００ｔ混铁炉的实际生产状况,采取热喷补修补炉内薄弱环节、严格工艺操作等措施,使混铁炉的使用寿命由平均不足３１２ｄ提高到５０５ｄ,铁水吞吐量由７０万ｔ提高到１３２万ｔ     

停泵后裂缝内液体温度恢复的研究

本文提出了一种新的计算停泵后裂缝内液体温度恢复的数学模型,在此基础上可对裂缝闭合过程进行比较详细的研究,使二维压裂设计更趋完善。