Synthesis and evaluation of fluorosilicone‐modified starch for protection of historic stone

Starch is sensitive to moisture and is weak to durability in the protection application to ancient relics. Therefore, two fluorosilicone‐modified starches are firstly prepared and evaluated for the protection of historic stones. The fluoro‐silicone copolymer grafted starch of P(VTMS/12FMA)‐g‐starch is synthesized by grafting copolymer of vinyltrimethoxysilane (VTMS) and dodecafluoroheptyl methacrylate (12FMA) onto starch. While the fluoro‐silicone starch latex of VTMS‐starch@P(MMA/BA/3FMA) is obtained by emulsion polymerization of VTMS primarily grafted‐starch (VTMS‐starch) with methyl methacrylate (MMA), butyl acrylate (BA) and 2,2,2‐trifluoroethyl methacrylate (3FMA). The grafting fluorosilicone copolymer onto starch improves obviously their hydrophobic and thermal properties. Comparatively, VTMS‐starch@P(MMA/BA/3FMA) film performs higher water contact angle (107°) and thermal stability (350–430°C) than p(VTMS/12FMA)‐g‐starch film (72°, 250–420°C) due to the migration of fluorine‐containing group onto the surface of film during the film formation. Therefore, VTMS‐starch@P(MMA/BA/3FMA) shows much better protective performance in water‐resistance, and salt/freeze‐thaw resistance for stone samples. © 2014 Wiley Periodicals, Inc. J. Appl. Polym. Sci. 2015 , 132, 41650.     

Architectural engineering inspired method of preparing Cf/ZrC–SiC with graceful mechanical responses

Inspired by grouting technique in architectural engineering, an innovative method of slurry injection and vacuum impregnation was put forward to introduce nanosized ZrC–SiC ceramics into PyC modified 3-D needle-punched carbon fiber preform homogeneously and continuously, followed by spark plasma sintering to prepare C_f/ZrC–SiC with graceful mechanical responses. The composite possessed improved fracture toughness and work of fracture at 5.37 ± 0.25 MPa∙m^1/2 and 951 ± 12 J/m², 50% and nearly one order of magnitude higher than those of ZrC–SiC composite, respectively, with rivaling flexural strength at 177 ± 8 MPa synchronously. A graceful fracture mode was embodied in an obviously extended yield plateau with increased failure displacement by 300%. This enhancement was attributed to the uniform and continuous combination of ZrC–SiC with carbon fiber preform as well as protection and interface tailoring from PyC coating. The study offered an easy and effective method of preparing 3-D fiber reinforced ceramic matrix composites.     

Cellular morphology evolution of chain extended poly(butylene succinate)/organic montmorillonite nanocomposite foam

Polymer foam with complex cellular structure (CCS) possessing both large cell and small cell simultaneously has lower density as well as better mechanical and thermal properties than those with mono-porous cell structure, which could be applied in the fields of packaging and construction materials. In this article, organic montmorillonite (OMMT) was introduced into chain-extended poly(butylene succinate) (CPBS) through melt blending method. CCS in the resultant CPBS samples were generated in a stainless steel autoclave using supercritical CO₂ as physical blowing agent by a cooling and two-step depressurization method. The crystallization temperature and crystallinity of CPBS increased by 4 °C and 2% respectively, due to the introduction of OMMT. Exfoliated structure of OMMT and some fish scale-like OMMT were observed in the CPBS/OMMT nanocomposites. The optimum range of the first depressurization between 1 and 7 MPa for fabricating the CCS in the CPBS foams with different contents of OMMT was obtained. © 2018 Wiley Periodicals, Inc. J. Appl. Polym. Sci. 2019 , 136, 47107     

碳四烯烃制丙烯催化剂及其工业应用

研究碳四烯烃催化裂解制丙烯BOC-1催化剂的放大制备及其工业应用,详细介绍催化剂放大制备后实验室小试和工业应用评价结果。BOC-1催化剂在工业生产装置中运行和再生性能良好,丙烯单程收率28.5%,碳四烯烃转化率82.1%,催化剂使用周期17天,各项性能指标均超过洛阳炼化宏力化工有限责任公司的工业催化剂水平,适合进一步推广使用。建立由烯烃催化裂解、吸收稳定、气分、MTBE醚化和烷烃分离5个单元组成的碳四烯烃资源综合利用工艺流程,并使用VMGSim流程模拟软件进行模拟计算。结果表明,采用新工艺流程,碳四烯烃综合利用率99.3%,聚合级丙烯收率35.19%。     

一种一锅法合成2,3-二苯基苯并呋喃的方法研究

2-炔基苯甲醚在碘存在下进行亲电环化反应得到3-碘代苯并呋喃衍生物,而后在水相中与硼酸酯进行钯催化的串联Suzuki反应,一锅法得到2,3-二苯基苯并呋喃的衍生物。并对反应机理进行了初步探索。     

Subcritical water extraction of bioactive compounds from Radix Puerariae and optimization study using response surface methodology

Subcritical water extraction (SWE) of bioactive extracts from Radix Puerariae (RP) was firstly optimized by response surface methodology (RSM) and its extraction efficiency was compared with two traditional volatile isolation methods including hot water extraction (HWE) and ethanol reflux extraction (ERE). The optimal SWE parameters were as follows: extraction temperature of 141?°C, extraction time of 58?min, and liquid-solid ratio l of 23:1?mL/g. Under these conditions, yield of bioactive extracts was 28.9?±?0.2%, which was slightly higher than that obtained by ERE, and more than two-fold the value obtained by HWE respectively. Isoflavones and polysaccharide content in SWE was significantly higher than that of HWE and slight lower than that of ERE. The results indicated that SWE could be a productive and environmental friendly technique for extracting bioactive extracts from RP.     

我国氢能产业发展和氢资源探讨

分析了我国氢能产业近期发展情况,我国氢能产业正步入快速发展机遇期。指出氢能是21世纪最具发展潜力的一种清洁二次能源,具有"清洁、高效、安全、可持续"四大特点,被誉为未来世界能源架构的核心。重点讨论了我国氢资源和绿色氢气制备问题,指出目前实际使用的氢气包括"灰氢""蓝氢"和"绿氢"三大类,显然"灰氢"不可取,"蓝氢"可以用,"废氢"可回收,"绿氢"是方向。讨论了加快氢能系统建设,建立发展氢气存储和运输系统及加氢站基础设施建设等问题。未来,我国氢能产业发展潜力巨大,但是在下决心大力发展氢能产业时,需要高度注意目前存在的实际情况和困难,要防范一系列的产业风险,做到有序发展,稳中有进,才能实施氢能产业的可持续发展。     

差异化供风在3000 t/d生产线篦冷机改造上的应用实践

我公司1号线篦冷机是由德国CP公司制造,型号HE6-1059。于2003年7月投入运营,该篦冷机篦床为一段,总计65排,宽度3 048 mm。其中HE组件篦板为6排,倾斜角度为20°,其余59排为水平推动篦床。     

Machine Learning Reduced Gene/Non-Coding RNA Features That Classify Schizophrenia Patients Accurately and Highlight Insightful Gene Clusters

RNA-seq has been a powerful method to detect the differentially expressed genes/long non-coding RNAs (lncRNAs) in schizophrenia (SCZ) patients; however, due to overfitting problems differentially expressed targets (DETs) cannot be used properly as biomarkers. This study used machine learning to reduce gene/non-coding RNA features. Dorsolateral prefrontal cortex (dlpfc) RNA-seq data from 254 individuals was obtained from the CommonMind consortium. The average predictive accuracy for SCZ patients was 67% based on coding genes, and 96% based on long non-coding RNAs (lncRNAs). Machine learning is a powerful algorithm to reduce functional biomarkers in SCZ patients. The lncRNAs capture the characteristics of SCZ tissue more accurately than mRNA as the former regulate every level of gene expression, not limited to mRNA levels.