检索结果-南通市图书馆

Biobased Aromatic-Aliphatic Polyols by Thiol-Ene Reactions of Propoxylated Mercaptanized Cardanol

Journal of Renewable Materials 2018年第6期6卷 630-641页

作者： Maha L.Shrestha mihail ionescu Xianmei Wan Thomas Upshaw Kansas Polymer Research Center Pittsburg State University1701 South BroadwayPittsburgKansasUSA 66762 Department of Chemistry Pittsburg State University1701 South BroadwayPittsburgKansasUSA 66762 Chevron Phillips Chemical Company LP Bartlesville Technology CenterBartlesvilleOklahomaUSA 74003

Aromatic-aliphatic polyols were obtained previously from the thiol-ene reactions of propoxylated cardanol with hydroxyalkyl mercaptans;these aromatic-aliphatic polyols were then utilized in the preparation of rigid polyurethane foams with excellent properties.The current work describes a variant of cardanol polyol synthesis by thiol-ene reactions in three steps.The first step is propoxylation of cardanol by reacting cardanol with propylene oxide;the second step is mercaptanization of propoxylated cardanol by reacting double bonds with hydrogen sulfide;and the third step involves the addition of the thiol groups of mercaptanized propoxylated cardanol to the double bonds of allyl alcohol,glycerol-1-allyl ether,and trimethylolpropane allyl ether.Thus,obtained polyols were characterized by standard analytical methods.Rigid polyurethane foams prepared from these polyols show promising physical-mechanical properties.The rigid polyurethane foams can be used for various applications such as thermo-insulation of freezers,storage tanks and pipes for food and chemical industries,wood substitutes and flotation materials.

关键词： Cardanol mercaptanized propoxylated cardanol photochemical thiol-ene reaction allyl alcohol glycerol-1-allyl ether trimethylolpropane allyl ether

来源：

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

Effect of tellurium(Te^(4+))irradiation on microstructure and associated irradiation-induced hardening

引用

Chinese Physics B 2021年第5期30卷 87-92页

作者：黄鹤飞刘继召雷冠虹 Ondrej Muránsky Tao Wei mihail ionescu Shanghai Institute of Applied Physics Chinese Academy of SciencesShanghai 201800China School of Nuclear Science and Technology University of Chinese Academy of SciencesBeijing 100049China Australian Nuclear Science and Technology Organisation(ANSTO) Lucas HeightsSydneyNSW2234Australia University of New South Wales(UNSW) KensingtonSydneyNSW2052Australia

The GH3535 alloy samples were irradiated using 15-MeV Te^(4+) ions at 650℃to a dose of 0.5,3.0,10,and 20 dpa,respectively.The Te atoms distribution and microstructure evolution were examined by electron probe microanalysis(EPMA)and transmission electron microscopy(TEM).The nano-indenter was then used to measure the nano-hardness changes of samples before and after irradiation.TEM results showed the formation of dislocation loops in the irradiated samples.Their mean diameters increase with the increase of irradiation dose and tends to be saturated when irradiation dose exceeds 10 dpa.The ratio of yield strength increments calculated by dispersed barrier hardening(DBH)model is basically consistent with that of nano-hardness increments measured by nano-indenter.In addition,the relationship between the nano-hardness increments and dpa for the GH3535 alloy irradiated by Te ions has been revealed in the study.

关键词： GH3535 alloy Te ions irradiation microstructural evolution irradiation hardening

来源：

维普期刊数据库

同方期刊数据库评论

在线全文

学校读者我要写书评

暂无评论

Biobased Aromatic-Aliphatic Polyols from Cardanol by Thermal Thiol-Ene Reaction

引用

Journal of Renewable Materials 2018年第1期6卷 87-101页

作者： Maha LShrestha mihail ionescu Xianmei Wan Nikola Bilic′ Zoran SPetrovic′ Tom Upshaw Pittsburg State University Kansas Polymer Research Center1701 South BroadwayPittsburgKansas66762USA Chevron Phillips Chemical Company LP Bartlesville Technology CenterBartlesvilleOklahoma74003-6670USA

Cardanol is a natural phenol which is obtained from high vacuum distillation of cashew nut shell liquid.It contains a hydrocarbon chain of 15 carbon atoms in the meta position,either with one,two or three nonconjugated double bonds.This article describes thermal thiol-ene reaction to synthesize new cardanol-based polyols for polyurethanes with aromatic-aliphatic structure.Phenolic hydroxyl group was blocked by alkoxylation and 2-mercaptoethanol was added to the double bonds of propoxylated cardanol.The resultant product is a mixture of polyols that may contain one,two,three or four hydroxyl groups,as a function of the number of double bonds reacted with 2-mercaptoethanol.Similar polyols,but with much higher functionality,were also synthesized from condensation of cardanol-based novolacs with formaldehyde.These cardanolbased polyols were further utilized to prepare rigid polyurethane foams(PUs)with excellent physical and mechanical properties,useful for various applications in chemical and food industries.

关键词： Thiol-ene mercaptans cashew nut shell liquid polyurethanes

来源：

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

Biobased Aromatic-Aliphatic Polyols from Cardanol by Photochemical Thiol-ene Reaction

引用

Journal of Renewable Materials 2018年第5期6卷 504-516页

作者： Maha L.Shrestha mihail ionescu Xianmei Wan Zoran S.Petrović Kansas Polymer Research Center Pittsburg State UniversityPittsburgKansasUSA 66762 Department of Chemistry Pittsburg State UniversityPittsburgKansasUSA 66762

Biobased aromatic-aliphatic polyols were previously synthesized from a thermal thiol-ene reaction of propoxylated cardanol with 2-mercaptoethanol(ME)in the presence of azobisisobutyronitrile(AIBN)as a radical initiator.Cardanol used for this purpose was obtained as a dark-brown liquid(Gardner Color Reference^18).The photochemical thiol-ene reaction can also be used to prepare aromatic-aliphatic polyols by employing cardanol.Via the photochemical thiol-ene reaction,2-mercaptoethanol was added successfully to C=C double bond of cardanol,suggesting that phenolic group may not play an inhibitory role in the radical thiol-ene reaction.However,we preferred to alkoxylate the phenolic hydroxyl group of cardanol,which is much more reactive with isocyanates than phenolic hydroxyls,to generate a new aliphatic hydroxyl group.Furthermore,the functionality of polyols was also improved by two methods:1)using 1-thio-glycerol instead of 2-mercaptoethanol and 2)using alkoxylated cardanol with glycidol(Cardanol-GLY)instead of propoxylated cardanol(Cardanol-PO).These polyols were then used in preparation of rigid polyurethane foams that can be useful in various applications such as insulation of freezers,pipes and storage tanks in food and chemical industries.

关键词： Cardanol photochemical reactions thiol-ene reaction 2-mercaptoethanol 1-thio-glycerol

来源：

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

欢迎您,

建议与咨询留下您的常用邮箱和电话号码，以便我们向您反馈解决方案和替代方法

时间限定

文献类型

馆藏选择

核心期刊

语言

文献类型

帮助

文字说明：

检索规则说明：

检索范例：

分类表

所选分类

限定检索结果

文献类型

馆藏范围

日期分布

学科分类号

主题

机构

作者

语言

在线全文

在线全文

在线全文

在线全文

请选择保存的检索档案：

请选择收藏分类：

通借通还

欢迎您,

建议与咨询 留下您的常用邮箱和电话号码，以便我们向您反馈解决方案和替代方法

时间限定

文献类型

馆藏选择

核心期刊

语言

文献类型

帮助

文字说明：

检索规则说明：

检索范例：

分类表

所选分类

限定检索结果

文献类型

馆藏范围

日期分布

学科分类号

主题

机构

作者

语言

在线全文

在线全文

在线全文

在线全文

请选择保存的检索档案： 新增检索档案 确定 取消

请选择收藏分类： 新增自定义分类 确定 取消

通借通还

建议与咨询留下您的常用邮箱和电话号码，以便我们向您反馈解决方案和替代方法

请选择保存的检索档案：

请选择收藏分类：