检索结果-南通市图书馆

邻位酰胺双官能苯并[口恶]嗪树脂的合成及其热性能与介电性能研究

2019年高分子材料学术交流会

作者： Yuqi Liu mengchao han Zhikun Shang Xingye Yu Kan Zhang Research School of Polymeric Materials School of Materials Science and EngineeringJiangsu University

A new type of atropisomerism has recently been discovered in 1,3-benzoxazines, where the intramolecular repulsion between negatively charged oxygen atoms on the imide and the oxazine ring hinders the rotation about the C–N bond. The imide group offers a high degree of flexibility for functionalization, allowing a variety of functional groups to be attached, and producing different types of end-caps. In this work, the effects of end-caps on the atropisomerism, thermally activated polymerization of ortho-imide functional benzoxazines, and the associated properties of polybenzoxazines have been systematically investigated. Several end-caps, with different electronic characteristics and rigidities, were designed. H and C nuclear magnetic resonance(NMR) spectroscopy and density functional theory(DFT)calculations were employed to obtain structural information, and differential scanning calorimetry(DSC) and in situ Fourier transform infrared(FT-IR) spectroscopy were also performed to study the thermally activated polymerization process of benzoxazine monomers. We demonstrated that the atropisomerization can be switched on/off by the manipulation of the steric structure of the end-caps, and polymerization behaviors can be well-controlled by the electronic properties of the ***, a trade-off effect were found between the thermal properties and the rigidity of the end-caps in polybenzoxazines.

关键词：

来源： cnki会议评论

在线全文

cnki会议

学校读者我要写书评

暂无评论

化工新型材料 2020年第8期48卷 156-159,164页

作者：韩梦超刘时海盛维琛张侃江苏省高性能纤维复合材料重点实验室常州市宏发纵横新材料科技股份有限公司常州213135 江苏大学材料科学与工程学院镇江212013

以邻位酰胺双酚、甲醛溶液及间氨基苯乙炔为原料,通过曼尼希反应成功地合成了一种新型乙炔基邻位酰胺双官能化苯并[口恶]嗪单体(AI-ac),并经升温处理得到聚苯并[口恶]嗪[poly(AI-ac)]及聚苯并[口恶]唑(PBO-AI-ac)。采用核磁共振氢谱/碳... 详细信息

以邻位酰胺双酚、甲醛溶液及间氨基苯乙炔为原料,通过曼尼希反应成功地合成了一种新型乙炔基邻位酰胺双官能化苯并[口恶]嗪单体(AI-ac),并经升温处理得到聚苯并[口恶]嗪[poly(AI-ac)]及聚苯并[口恶]唑(PBO-AI-ac)。采用核磁共振氢谱/碳谱和傅里叶变换红外光谱对该苯并[口恶]嗪的化学结构进行了表征。采用差示扫描量热法和原位红外光谱对单体聚合进行了研究。采用热重分析和动态/静态机械分析分别研究了聚苯并[口恶]嗪的热稳定性及相关力学特征。结果表明:AI-ac[口恶]嗪单体具有较低的固化温度,且聚苯并[口恶]嗪及聚苯并[口恶]唑有着良好的热稳定性和优异的介电性能。两者在800℃氮气氛围中的残炭率分别高达65%和70%。

关键词：苯并[口恶]嗪开环聚合热性能介电性能

在线全文

学校读者我要写书评

暂无评论

手术切除治疗原发性肝癌的疗效评价

上海医学 1999年第1期22卷 19-21页

作者：杨广顺吴孟超陈汉杨甲梅姚晓平吴伯文第二军医大学东方肝胆外科医院

目的评价原发性肝癌手术切除治疗后的疗效。方法分析１９６０年１月至１９９６年９月原发性肝癌３９３２例行手术切除治疗后手术死亡率和生存率。结果比较１９６０～１９７７年（ｎ＝１８１）、１９７８～１９８９年（ｎ＝９２１）、１... 详细信息

目的评价原发性肝癌手术切除治疗后的疗效。方法分析１９６０年１月至１９９６年９月原发性肝癌３９３２例行手术切除治疗后手术死亡率和生存率。结果比较１９６０～１９７７年（ｎ＝１８１）、１９７８～１９８９年（ｎ＝９２１）、１９９０～１９９６年（ｎ＝２８３０）三阶段，术后死亡率分别为８．８４％、０．４３％、０．３５％，而５年生存率分别为１６．０％、３０．６％、４８．６％。比较局部肝切除术（ｎ＝９０２）与规则性肝切除术（ｎ＝１１４９）表明，局部切除术手术死亡率低（０．１０％对４．７％，Ｐ＜０．０５），而５年生存率两者无明显差异（３６．１％对４０．３％，Ｐ＞０．０５）。比较大肝癌（＞５ｃｍ，ｎ＝３２２３）与≤５ｃｍ肝癌（ｎ＝７０９）和≤３ｃｍ肝癌（ｎ＝２４１）资料，１、３、５年生存率分别为６２．５％、４２．６％、２７．５％；８９．９％、８５．０％、７９．８和９５．５％、９１．７％、８５．３％。肝癌切除加门静脉（ｎ＝６５）或胆管内（ｎ＝２３）癌栓清除术治疗肝癌伴有癌栓者，术后２年生存率分别为２５．３％和３６．５％。肝癌切除加脾切除和／或门奇断流术治疗肝癌合并门静脉高压者（ｎ＝４８），术后１、２年生存率为８３．４％和７５．２?

关键词：原发性肝肿瘤外科手术疗效

肝细胞生长因子及其受体基因在大鼠肝脏癌变过程中的表达

在线全文

学校读者我要写书评

暂无评论

外科理论与实践 1998年第1期3卷 33-35页

作者：罗运权吴孟超陈汉第二军医大学东方肝胆外科医院 200433

目的:了解肝细胞生长因子(HGF)及其受体基因在大鼠肝脏癌变过程中的表达变化规律,以及这些变化与肿瘤生物学行为的关系.方法:以二乙基亚硝胺(DENA)诱发的大鼠肝癌模型为对象,采用地高辛标记的HGF及其受体DNA探针,检测HGF及其受体基因在... 详细信息

目的:了解肝细胞生长因子(HGF)及其受体基因在大鼠肝脏癌变过程中的表达变化规律,以及这些变化与肿瘤生物学行为的关系.方法:以二乙基亚硝胺(DENA)诱发的大鼠肝癌模型为对象,采用地高辛标记的HGF及其受体DNA探针,检测HGF及其受体基因在大鼠肝脏癌变过程中的表达.结果:HGF及其受体基因在大鼠肝脏组织中均有表达,但在诱癌的不同时期,其表达阳性率差异明显,HGF表达阳性率在肝硬变前期达最高,肝硬变期次之,癌变期与正常对照相比差异无显著意义.HGF受体基因表达阳性率随肝组织逐渐癌变呈逐渐增加趋势,以癌变期为最高,正常肝组织中未见表达.结论:HGF及其受体基因过量表达与大鼠肝脏癌变的演化过程关系密切,HGF及其受体系统对调节肿瘤生长、转移起重要作用.

关键词：肝肿瘤肝细胞生长因子受体基因表达

Modulating reaction pathways of formic acid oxidation for optimized electrocatalytic performance of PtAu/CoNC

在线全文

学校读者我要写书评

暂无评论

Nano Research 2022年第2期15卷 1221-1229页

作者： mengchao Liang Tianyu Xia han Gao Kai Zhao Tianqi Cao Meng Deng Xiaoyan Ren Shunfang Li Haizhong Guo Rongming Wang Key Laboratory of Material Physics Ministry of EducationSchool of Physics and MicroelectronicsZhengzhou UniversityZhengzhou 450052China Collaborative Innovation Center of Light Manipulations and Applications Shandong Normal UniversityJinanShandong 250358China Beijing Advanced Innovation Center for Materials Genome Engineering Beijing Key Laboratory for Magneto-Photoelectrical Composite and Interface ScienceSchool of Mathematics and PhysicsUniversity of Science and Technology BeijingBeijing 100083China

Formic acid oxidation(FAO)is a typical anode reaction in fuel cells that can be facilitated by modulating its direct and indirect reaction ***,PtAu bimetallic nanoparticles loaded onto Co and N co-doping carbon nanoframes(CoNC NFs)were designed to improve the selectivity of the direct reaction pathway for efficient *** on these subtle nanomaterials,the influences of elemental composition and carbon-support materials on the two pathways of FAO were investigated in *** results of fuel cell tests verified that the appropriate amount of Au in PtAu/CoNC can promote a direct reaction pathway for FAO,which is crucial for enhancing the oxidation efficiency of formic *** particular,the obtained PtAu/CoNC with an optimal Pt/Au atomic ratio of 1:1(PtAu/CoNC-3)manifests the best catalytic performance among the analogous obtained Pt-based *** FAO mass activity of the PtAu/CoNC-3 sample reached 0.88 A·mg_(Pt)^(-1),which is 26.0 times higher than that of Pt/*** results of first-principles calculation and CO stripping jointly demonstrate that the CO adsorption of PtAu/CoNC is considerably lower than that of Pt/CoNC and PtAu/C,which indicates that the synergistic effect of Pt,Au,and CoNC NFs is critical for the resistance of Pt to CO *** work is of great significance for a deeper understanding of the oxidation mechanism of formic acid and provides a feasible and promising strategy for enhancing the catalytic performance of the catalyst by improving the direct reaction pathway for FAO.

关键词： formic acid oxidation direct oxidation pathway metal organic framework co-doping CO binding energy

肝缺血预处理对肝再灌注期间热休克蛋白70的表达及肝脏病理改变的影响

维普期刊数据库评论

在线全文

维普期刊数据库

学校读者我要写书评

暂无评论

外科理论与实践 1999年第3期4卷 171-172页

作者：孙经建吴孟超陈汉钱光相丛文铭张秀忠第二军医大学东方肝胆外科医院 200433

评价缺血预处理对大鼠肝缺血再灌注后肝细胞热休克蛋白70(HSP70)的表达和肝组织形态学的影响。方法:大鼠78只分为3组:缺血预处理组、肝血流持续阻断组及假处理组。用免疫金银法动态观察再灌注24h内HSP70蛋白的表达,同时观察肝脏的病理... 详细信息

评价缺血预处理对大鼠肝缺血再灌注后肝细胞热休克蛋白70(HSP70)的表达和肝组织形态学的影响。方法:大鼠78只分为3组:缺血预处理组、肝血流持续阻断组及假处理组。用免疫金银法动态观察再灌注24h内HSP70蛋白的表达,同时观察肝脏的病理改变。结果:肝缺血预处理能较早诱导HSP70的表达,肝细胞损伤也相应较轻。结论:肝缺血预处理可增加组织对缺血再灌注损伤的耐受性,该保护作用可能与早期诱导HSP70蛋白的产生有关。

关键词：肝缺血预处理热休克蛋白70 肝脏病理

Chemical constituents and biological activities of Azadirachta indica A. Juss

在线全文

学校读者我要写书评

暂无评论

Asian Journal of Traditional Medicines 2019年第1期14卷 52-63页

作者： Xuegui Liu Yuqiu Sun Jun Bian mengchao Lv Ting han Danqi Li Pinyi Gao College of Pharmaceutical and Biological Engineering Shenyang University of Chemical Technology Shenyang Liaoning 110142 P. R. China

Azadirachta indica A. Juss is a tropical evergreen plant, belonging to the Meliaceae family. The plant is used as folk medicines for the treatment of fever, neuromuscular pains, skin infections, diabetes and heart disease. Previous researches show that the plant possesses several types of chemical constituents and diverse biological activities. The paper concludes chemical constituents, biological activities and pesticide products of A. indica.

关键词： Azadirachta indica A. Juss chemical constituents pharmacological activities pesticide products review

Percutaneous Radiofrequency Ablation for Hepatic Malignancies

维普期刊数据库评论

在线全文

维普期刊数据库

学校读者我要写书评

暂无评论

The Chinese-German Journal of Clinical Oncology 2002年第3期1卷 159-162页

作者： ZhanGZhijian WUmengchao 等 EasternHepatobiliarySurgeryHospital SecondMilitaryMedicalUniversityShanghai200438China

Objective To study the therapeutic efficay of percutaneous radiofrequency ablation(PRFA)for hepatic malignancies and to definr its indications and its criteria of the curative *** In 100 patients with histologically of clinically confirmed hepatocellular carcinoma(HCC)or liver metastases we performed PRFA under ultrasound guidance using Le Veen multipolar array meedle electrode and RF 2000 *** patients were followed to identify complications and to assess treatment *** PRFA was performed in 76 patients with HCC and in 24 with liver *** Alpha-fetoprotein(AFP)levles of the AFP positive HCC patients with inoperable small HCCs decreased to normal in 75.0%(21/28)and decreased markedly in 21.4%(6/28).Complete necrosis of small hepatic malignancies,documented by magnetic resonance imaging(MRI)was achieved in 85.9%(61/71).If the tumor shows iso-or hyper-intensity on Ti-weighted images,and relative hypointensity on T2-weighted images,and no enhanced intensity on dynamic contrast-enhanced MR imaging,it is considered completely *** PRFA is a novel local thermal palliative therapy for small hepatic malignancies that is minimally invasive,safe and *** patients with large lesions it can be combined with transarterial chemoembolization(TACE).Critera for curative treatment are normalization of serum AFP and /or MRI or CT scan findings showing complete necrosis.

关键词：肝脏恶性肿瘤经皮射频热凝治疗临床疗效 MRI

Some Therapeutic Concepts Converse of Primary Liver Cancer in China

在线全文

学校读者我要写书评

暂无评论

The Chinese-German Journal of Clinical Oncology 2002年第3期1卷 156-158页

作者： CHENhan WUmengchao 等 EasternHepatobiliarySurgeryHospital SecondMilitaryMedicalUniversityShanghai200438China

Since 1990's,comprehensive therapy predominated by surgery has become the maintrend in the treatment of primary liver cancer(PLC).W elucidate concepts converse of operative indication,operative mode,postoperative anti-recurrence,approach of comprechensive treatment and theraeutic model in *** new concepts have gradually involoved in clinical diagnosis and treatment,which promotes the advance in hepatic surgery.

关键词：中国原发性肝癌综合治疗肝脏手术