作者机构：
[Chen, Xiaohua; Xu, Yali; Xiao, Kuikui; Zhu, Yanfei; Peng, Yufan; Liu, Zheng; Liu, Jilei] Hunan Univ, Coll Mat Sci & Engn, Hunan Prov Key Lab Adv Carbon Mat & Appl Technol, Changsha 410082, Peoples R China.;[Liu, Zheng] Hunan City Univ, Coll Mat & Chem Engn, All Solid State Energy Storage Mat & Devices Key, Yiyang 413000, Peoples R China.
通讯机构：
[Yanfei Zhu; Xiaohua Chen] C;College of Materials Science and Engineering, Hunan Province Key Laboratory for Advanced Carbon Materials and Applied Technology, Hunan University, Changsha 410082, China
摘要：
<jats:p>The synthesis of sulfur heterocycles via the construction of C–S bonds has received considerable attention due to their biological value and extensive pharmaceutical application. While diverse sulfurating agents have been developed over the past few decades, in this regard, elemental sulfur, with advantages of low toxicity, odorless nature and chemical stability, has great potential for the construction of diverse sulfur heterocycles through its direct incorporation into the target molecules in a concise way. Direct functionalization of inert C–H bonds can shorten the number of reaction steps and minimize the amount of waste formed. Hence, heteroannulations via direct C–H sulfuration is considered to be an attractive strategy for the synthesis of sulfur heterocycles. In the last few years, a vast array of concise systems have been reported for the synthesis of some valuable sulfur heterocycles such as thiophenes, thienoindoles, thienothiazoles, thiazoles, benzothiazoles, and thiadiazoles through direct C–H sulfuration/annulations with elemental sulfur. These are discussed in detail in this review.</jats:p><jats:p>1 Introduction</jats:p><jats:p>2 Thiophenes</jats:p><jats:p>3 Thienoindoles</jats:p><jats:p>4 Thienothiazoles</jats:p><jats:p>5 Other Fused Thiophenes</jats:p><jats:p>6 Thiazoles</jats:p><jats:p>7 Benzothiazoles</jats:p><jats:p>8 Thiadiazoles</jats:p><jats:p>9 Others</jats:p><jats:p>10 Summary and Outlook</jats:p>
摘要：
<jats:p>
For the first time, alternating trilinear decomposition-assisted multivariate curve resolution (ATLD-MCR) was applied to analyse complex gas chromatography–mass spectrometric (GC-MS) data with severe baseline drifts, serious co-elution peaks and slight retention time shifts for the simultaneous identification and quantification of polycyclic aromatic hydrocarbons (PAHs) in aerosols. It was also compared with the classic multivariate curve resolution-alternating least-squares (MCR-ALS) and the GC-MS-based external standard method. In validation samples, average recoveries of five PAHs were within the range from (96.2 ± 6.8)% to (106.5 ± 4.1)% for ATLD-MCR, near to the results of MCR-ALS ((98.0 ± 1.5)% to (106.7 ± 4.3)%). In aerosol samples, the concentrations of pyrene provided by ATLD-MCR were not significantly different from those of MCR-ALS. The other four PAHs including chrysene, benzo[a]anthracene, fluoranthene and benzo[b]fluoranthene were not detected by ATLD-MCR and the GC-MS-based external standard method. The results of figures of merit further demonstrated that ATLD-MCR achieved high sensitivities (8.9 × 10
<jats:sup>4</jats:sup>
to 1.7 × 10
<jats:sup>6</jats:sup>
mAU ml µg
<jats:sup>−1</jats:sup>
) and low limits of detection (0.003 to 0.087 µg ml
<jats:sup>−1</jats:sup>
), which were better than or similar to MCR-ALS, presenting a great choice to deal with complex GC-MS data for the simultaneous determination of targeted PAHs in aerosols.
</jats:p>
摘要：
Abstract: In this study, ramie fiber is used as raw materials and modified by sodium hydroxide with different mass concentration. It was found that the surface of modified ramie fiber became rough and had a lot of pore structure, and the number of hydroxyl groups on the surface of ramie fiber decreased and the hydrophobicity and lipophilicity of ramie fiber increased, which is beneficial to improve oil absorption. Oil absorbency and oil retention of ramie modified by NaOH solution with different concentrations for peanut oil adsorption were studied. It was found that ramie fiber modified by 8 wt% NaOH solution has the best adsorption effect, and by 8 wt% NaOH solution the best oil retention.#@#@#摘要: 本文采用苎麻纤维为原料，配制不同质量浓度的氢氧化钠对其改性。对改性前后苎麻纤维的化学结构和微观形貌进行了表征，发现苎麻纤维表面羟基变少，疏水亲油性能增强，改性后苎麻纤维表面变得粗糙，孔结构增多，有利于吸油。论文考察其对花生油的吸油效果和保油性能，研究发现8%的氢氧化钠溶液改性后的苎麻纤维的吸附效果最好，4%的氢氧化钠溶液改性后的苎麻纤维的保油效果最好。
作者机构：
[刘素纯] College of Food Science and Technology, Hunan Agricultural University, Hunan, Changsha, 410128, China;[徐正刚] School of Materials and Chemical Engineering, Hunan City University, Hunan, Yiyang, 413000, China;[胡治远] College of Food Science and Technology, Hunan Agricultural University, Hunan, Changsha, 410128, China<&wdkj&>School of Materials and Chemical Engineering, Hunan City University, Hunan, Yiyang, 413000, China
作者机构：
[杨泛明; 黎丽君; 肖浪; 廖敏; 张可意; 贺国文] College of Materials and Chemical Engineering, Hunan City University, Yiyang;413000, China;[谭伟石] All-Solid-State Energy Storage Materials and Devices Key Laboratory of Hunan Province, Hunan City University, Yiyang;[杨泛明; 黎丽君; 肖浪; 廖敏; 张可意; 谭伟石; 贺国文] 413000, China
通讯机构：
[He, G.-W.] C;College of Materials and Chemical Engineering, China
期刊：
Journal of Applied Polymer Science,2021年138(31):50750- ISSN：0021-8995
通讯作者：
Li, Duxin
作者机构：
[Lang, Feng; Song, Ling; Li, Duxin; Lin, Yi] Cent South Univ, State Key Lab Powder Met, Changsha 410083, Peoples R China.;[Song, Ling; Jiang, Qibin] Zhuzhou Times New Mat Technol Co Ltd, Zhuzhou, Peoples R China.;[You, Yilan] Hunan City Univ, Coll Mat & Chem Engn, Yiyang, Peoples R China.
通讯机构：
[Li, Duxin] C;Cent South Univ, State Key Lab Powder Met, Changsha 410083, Peoples R China.
关键词：
Anionic polymerization;Combustion;Flame resistance;Polyamides;Rayon;Urea;Wear of materials;Diaminodiphenylsulfone;Flame extinction;Flame retardancy;Friction and wear properties;Hexamethylene diisocyanate;Impact property;Molecular chains;Nylon copolymer;Wear resistance
摘要：
In this study, reduced graphene oxide sheets (RGO) were previously modified by silane coupling when composited with Poly (phenylene sulfide) (PPS)/polyamide 6 (PA6) blends with a mass proportion of 4:6. Then the blends of RGO/PPS/PA6 were prepared under different mixing sequences, and it was found that the thermal conductivity of composite prepared by two-step blending showed enhanced values for immiscible blends compared with the one-step blending method at the same RGO loading. At the RGO loading of 4.06 wt%, the thermal conductivity of RGO/PPS/PA6 composite reached 0.74 W/(m center dot K) through the two-step blending method, which is 23.7% higher than that prepared by the one-step blending method. Moreover, great influences on the thermal conductivity and crystallization behavior of RGO were discussed. The thermal conductivity of RGO/PPS/PA6 composite with 36.36 wt% RGO reached 2.83 W/(m center dot K), which is 10.66 times higher than that of pure PPS/PA6 blend. Especially, based on DSC data, the introduction of PPS phase and RGO was proved to have little effect on the melting behavior of the composites, but a prominent heterogeneous nucleation effect and increased crystallization temperature were observed.
