通过在乙炔基官能化的氧杂降冰片烯和ω-叠氮基聚环氧乙烷之间的Huisgen 1,3-偶极环加成反应,合成了分子量为500 g / mol至5000 g / mol的ω-氧杂降冰片烯基聚(环氧乙烷)单甲醚大分子单体。一甲醚。热分析表明,大分子单体的ω- exo-降冰片烯端基在130°C下通过逆Diels-Alder过程转化为马来酰亚胺基。在室温下,使用Grubbs催化剂在二氯甲烷中研究了这些大分子单体的开环复分解聚合(ROMP)。聚(oxanorbornene) -克-根据主链和接枝链的长度,得到具有1.04至1.17的多分散性和9900至57 800 g / mol的分子量的聚(环氧乙烷),导致梳状或刷状共聚物。
Combining Ring-Opening Metathesis Polymerization (ROMP) with Sharpless-Type “Click” Reactions: An Easy Method for the Preparation of Side Chain Functionalized Poly(oxynorbornenes)
作者:Wolfgang H. Binder、Christian Kluger
DOI:10.1021/ma0480087
日期:2004.12.1
ROMP yielding the final polymers; (b) the ROMP polymerization furnishing first poly(oxynorbornenes) bearing acetylenic and azido moieties and subsequently attaching the functional units by use of the “click” reactions onto the modified polymers. Both strategies show efficient functionalization behavior with a high tolerance of functional groups with respect to the functional units attached as demonstrated
叠氮化物和乙炔之间的无尖锐的1,3-偶极环加成反应(“点击反应”)用于制备侧链内的功能性聚氧降冰片烯。应用了两种不同的策略将ROMP聚合物的制备方法与1,3-偶极环加成反应相结合:(a)通过1,3-偶极环加成反应将官能团(即疏水和氢键合单元)与7-带有乙炔的氧降冰片烯和随后的ROMP产生最终聚合物;(b)通过ROMP聚合反应,首先提供带有炔和叠氮基部分的聚(氧降冰片烯),然后通过“点击”反应将官能团连接到改性聚合物上。1 H和13 C NMR光谱学开辟了仅使用很少的原料制备多种官能化聚氧降冰片烯的可能性。
Nanostructured Block-Random Copolymers with Tunable Magnetic Properties
作者:Yongping Zha、Hitesh D. Thaker、Raghavendra R. Maddikeri、Samuel P. Gido、Mark T. Tuominen、Gregory N. Tew
DOI:10.1021/ja305249b
日期:2012.9.5
It was recently shown that block copolymers (BCPs) produced room-temperature ferromagnetic materials (RTFMs) due to their nanoscopic ordering and the cylindrical phase yielded the highest coercivity. Here, a series of metal-containing block-random copolymers composed of an alkyl-functionalized homo block (C-16) and a random block of cobalt complex- (Co) and ferrocene-functionalized (Fe) units was synthesized via ring-opening metathesis polymerization. Taking advantage of the block-random architecture, the influence of dipolar interactions on the magnetic properties of these nanostructured BCP materials was studied by varying the molar ratio of the Co units to the Fe units, while maintaining the cylindrical phase-separated morphology. DC magnetic measurements, including magnetization versus field, zero-field-cooled, and field-cooled, as well as AC susceptibility measurements showed that the magnetic properties of the nanostructured BCP materials could be easily tuned by diluting the cobalt density with Fe units in the cylindrical domains. Decreasing the cobalt density weakened the dipolar interactions of the cobalt nanoparticles, leading to the transition from a room temperature ferromagnetic (RTF) to a superparamagnetic material. These results confirmed that dipolar interactions of the cobalt nanoparticles within the phase-separated domains were responsible for the RTF properties of the nanostructured BCP materials.
Ferromagnetic block polymers and related methods
申请人:Tew Gregory N.
公开号:US20110064944A1
公开(公告)日:2011-03-17
Ferromagnetic multi-block copolymers of the sort which can be used to provide high-density, highly ordered thin films, composites and related articles.
Synthesis on N-Alkylated Maleimides
作者:Randell C. Clevenger、Kenneth D. Turnbull
DOI:10.1080/00397910008087165
日期:2000.4
Abstract A two step synthesis of N-alkylated maleimides is presented. This method allows for the use of widely available starting materials and produces maleimides in high purity and yields. The maleimide precursors are of interest for potential thermo- and photo-setting polymerization processes.
maleimide group through a retro-Diels−Alder process at 130 °C. Ring-openingmetathesispolymerization (ROMP) of these macromonomers was investigated using Grubbs’ catalyst in dichloromethane at room temperature. Poly(oxanorbornene)-g-poly(ethylene oxide)s were obtained with polydispersities between 1.04 and 1.17 and molecular weights between 9900 and 57 800 g/mol leading to comb or brush copolymers according
通过在乙炔基官能化的氧杂降冰片烯和ω-叠氮基聚环氧乙烷之间的Huisgen 1,3-偶极环加成反应,合成了分子量为500 g / mol至5000 g / mol的ω-氧杂降冰片烯基聚(环氧乙烷)单甲醚大分子单体。一甲醚。热分析表明,大分子单体的ω- exo-降冰片烯端基在130°C下通过逆Diels-Alder过程转化为马来酰亚胺基。在室温下,使用Grubbs催化剂在二氯甲烷中研究了这些大分子单体的开环复分解聚合(ROMP)。聚(oxanorbornene) -克-根据主链和接枝链的长度,得到具有1.04至1.17的多分散性和9900至57 800 g / mol的分子量的聚(环氧乙烷),导致梳状或刷状共聚物。