检索结果-南通市图书馆

Facile Preparation of Water-Soluble and Cytocompatible Small-Sized Chitosan-Polydopamine Nanoparticles

在线全文

学校读者我要写书评

暂无评论

Chinese Journal of Chemistry 2017年第6期35卷 931-937页

作者： Yunzhou Ni Feng Chen Leilei Shi gangsheng tong Jie Wang Huimei Li Chunyang Yu Yongfeng Zhou School of Chemistry and Chemical Engineering Shanghai Jiao Tong University Shanghai 200240 China State Key Laboratory of Metal Matrix Composites Shanghai Jiao Tong University Shanghai 200240 China Instrumental Analysis Center Shanghai Jiao Tong University Shanghai 200240 China

In this paper, a kind of novel water-soluble chitosan-polydopamine （CHT-PDA） nanoparticles with a hydrody- namic diameter （Dh） around 10 nm were reported by the combination of self-polymerization of PDA and electro- static complexation between PDA and CHT in water/DMSO （W/D） mixture at the molar fraction of DMSO （XDMSO =0.37）. The preparation method was efficient with a yield of 98% around. The as-prepared water-soluble CHT-PDA nanoparticles exhibited effective UV-screen ability, enhanced visible-light transmittance and good cyto- compatibility via MTT assay, which might be used in transparent formulation for UV protection usage, especially in biological field including sun care application.

关键词： chitosan polydopamine nanoparticles UV-screen visible-light transmittance

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

适用于地面装备的特种降温涂层研究与应用

电镀与涂饰 2024年第3期43卷 120-132页

作者：李昱霖张兴勇卞付国张崇印童刚生薛参上海机电工程研究所上海201109 上海航天设备制造总厂有限公司上海200245 上海航天特种环境高分子功能材料工程技术研究中心上海200245 上海交通大学上海200240 青岛九维华盾科技研究院有限公司山东青岛266555

[目的]为了有效降低太阳辐射引起的导弹温升,考察了一种针对地面装备的特种涂层的降温性能。[方法]通过基料与颜填料的筛选,确定以环氧树脂搭配固化剂作为基料,金红石型二氧化钛作为主要颜填料。对涂层方案及其作用机理进行分析后,确定... 详细信息

[目的]为了有效降低太阳辐射引起的导弹温升,考察了一种针对地面装备的特种涂层的降温性能。[方法]通过基料与颜填料的筛选,确定以环氧树脂搭配固化剂作为基料,金红石型二氧化钛作为主要颜填料。对涂层方案及其作用机理进行分析后,确定了特种降温涂层的设计原则。对涂层建立了热传导模型,分析辐射来源,对地面装备进行了仿真分析。[结果]通过试样级试验验证了特种涂层的环境适应性与降温性能。[结论]该特种降温涂层解决了太阳辐射下地面装备内部升温较高的问题,为地面装备的应用打下了基础。

关键词：地面装备环氧树脂金红石型二氧化钛降温涂层太阳辐射数值模拟

Sulfanion-initiated open-vessel anionic ring-opening polymerization of N-sulfonyl aziridines

在线全文

学校读者我要写书评

暂无评论

Science China Chemistry 2021年第10期64卷 1778-1785页

作者： Meng Huo Yawen Bian Chunyang Yu Gansheng tong Chongyin Zhang Xinyuan Zhu School of Chemistry'and Chemical Engineering Frontiers Science Center for Transformative MoleculesShanghai Key Laboratory of Electrical Insulation and Thermal AgingShanghai Jiao Tong UniversityShanghai 200240China Key Laboratory of Surface&Interface Science of Polymer Materials of Zhejiang Province Department of ChemistryZhejiang Sci-Tech UniversityHangzhou 310018China Shanghai Aerospace Equipments Manufacturer Co. Ltd.Shanghai Engineering Research Center of Specialized Polymer Materials for AerospaceShanghai 200245China

Anionic ring-opening polymerization(AROP)of N-sulfonyl aziridines is an important synthetic route to linear polyethyleneimine(PEI)and its derivatives.In most cases,inert atmosphere and dry solvent were needed because of the oxygen-and water-sensitive initiators/catalysts used.Therefore,the AROP of N-sulfonyl aziridines that can be entirely operated in air atmosphere is still a challenging task.Herein,we report a series of sulfanions,including xanthates,dithiocarbamates,dithiobenzoates,thioacetates,and thiolates,as the initiators for the AROP of N-sulfonyl aziridines.Due to their good stability,openvessel polymerization was achieved with high livingness,affording a range of well-definedα-,ω-telechelic poly(N-sulfonyl aziridine)homopolymers and block copolymers with narrow dispersities and tunable molecular weights.Theα-end group of these polyaziridines was readily converted to thiol group,which enabled further post-polymerization functionalization with benzyl acrylate and poly(ethylene glycol)via thiol-ene click chemistry.The establishment of open-vessel sulfanion-initiated AROP of N-sulfonyl aziridines thus lays a solid foundation for the bulk preparation and application of poly(N-sulfonyl aziridine)s and PEI derivatives.

关键词： anionic ring-opening polymerization sulfanion open-vessel N-sulfonyl aziridines

在线全文

学校读者我要写书评

暂无评论

新一代运载火箭整流罩低密度耐热涂层的研究

Aerospace China 2022年第3期23卷 44-50页

作者： WANG Jun tong gangsheng LI Mao DU tongliang HU Li LI Ying ZHANG Chongyin ZHU Xinyuan Shanghai Aerospace Equipments Manufacturing Co.Ltd. Shanghai 200245 Shanghai Jiao tong University Shanghai 200240 Shanghai Aerospace System Engineering Institute Shanghai 201109

In this paper,the properties of different low-density heat-resistant coating prescriptions were compared,and a heat-resistant coating with a density of 0.65 g/cm^(3),a tensile strength of 2.04 MPa,and a thermal conductivity of 0.126 W/(m·K)was obtained.The thermal performance of the coating was characterized by an oxygen-acetylene ablation test,a hot radiation test using a quartz lamp and in an arc-heated wind tunnel test.The results indicated that the low-density heat-resistant coating prescription has advantages of high temperature resistance,erosion resistance,ablative resistance and excellent heat resistance,which can satisfy the heat resistance requirements of new-generation launch vehicle fairings.The successful application of this heat-resistant coating technology resolved the problems of low efficiency and poor adhesive performance of the traditional hand-pasted cork process,and realized the rapid spray application of the thermal protection layer,effectively improved the manufacturing efficiency and production quality of the heat-resistant layer of new-generation launch vehicle fairings.

关键词： heat-resistant coating thermal protection layer ablative resistance

Hydrodeoxygenation of Phenolic Model Compounds over MoS2 Catalysts with Different Structures

在线全文

学校读者我要写书评

暂无评论

Chinese Journal of Chemical Engineering 2008年第5期16卷 733-739页

作者：杨运泉罗和安童刚生 Kevin J. Smith TYE Ching Thian Department of Chemical Engineering Xiangtan University Xiangtan 411105 China Department of Chemical and Biological Engineering University of British Columbia Vancouver B.C V6T 1Z3 Canada

不同结构的几 MoS2 催化剂，准备了由在铵Keptamolyb日期( AHM )和铝 naphthenate ( MoNaph )的 situ 分解，并且由 MoS2 脱落( TDM )，被赌注描绘，X光检查衍射( XRD )，精力散X光检查( EDX )和传播电子显微镜学( TEM )。分析证明那 Mo... 详细信息

不同结构的几 MoS2 催化剂，准备了由在铵Keptamolyb日期( AHM )和铝 naphthenate ( MoNaph )的 situ 分解，并且由 MoS2 脱落( TDM )，被赌注描绘，X光检查衍射( XRD )，精力散X光检查( EDX )和传播电子显微镜学( TEM )。分析证明那 MoS2 结构依赖于准备过程。催化剂的活动被用在氢并且温度从 320 鈥 ? 70qC 的 2.8 MPa 操作的一个批压热器反应堆测量酚， 4-methylphenol 和 4-methoxyphenol 的 hydrodeoxygenation (HDO ) 决定。由比较变换，催化剂的反应顺序是：AHM > TDM-D > MoNaph > 热 > MoS2 粉末 > TDM-W。另外， HDO 变换上的反应温度的效果以可逆反应动力学的平衡被解释。为酉分的混合物的 HDO 的主要产品被煤气的层析 / 团 spectrometry (GC/MS ) 识别。结果证明产品分发和 HDO 选择与反应温度被相关。二条平行反应线路，直接 hydrogenolysis 和联合 hydrogenation-hydrogenolysis，被产品分发的分析证实。高温度为酚和 4-methoxyphenol 的 HDO 在加氢上赞成了 hydrogenolysis，而为 4-methylphenol 颠倒是真的。

关键词：硫化钼催化剂酚类模型化合物加氢脱氧结构效应

非水滴定和傅立叶红外光谱在聚丙烯马来酸酐接枝物表征中的应用

在线全文

学校读者我要写书评

暂无评论

功能高分子学报 2005年第2期18卷 334-339页

作者：陈淼灿刘涛赵玲童刚生华东理工大学联合化学反应工程研究所上海200237

采用非水滴定法中的无机碱直接滴定方法测定了马来酸酐在聚丙烯上的接枝率,并对该方法作了可行性验证,讨论了非水滴定中的两个难点化学计量比的确定和滴定终点的判断。通过傅立叶红外光谱法(FTIR)对聚丙烯马来酸酐接枝物的纯化效果、自... 详细信息

采用非水滴定法中的无机碱直接滴定方法测定了马来酸酐在聚丙烯上的接枝率,并对该方法作了可行性验证,讨论了非水滴定中的两个难点化学计量比的确定和滴定终点的判断。通过傅立叶红外光谱法(FTIR)对聚丙烯马来酸酐接枝物的纯化效果、自由基引发反应对非水滴定的影响及聚丙烯接枝马来酸酐的反应机理作了定性分析,并结合非水滴定的数据绘制了红外定量校准曲线。

关键词：非水滴定傅立叶红外光谱聚丙烯马来酸酐接枝物接枝率反应机理结构表征