Site‐Selective, Multistep Functionalizations of CO2‐Based Hyperbranched Poly(alkynoate)s toward Functional Polymetric Materials,Advanced Science

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Site‐Selective, Multistep Functionalizations of CO2‐Based Hyperbranched Poly(alkynoate)s toward Functional Polymetric Materials
Advanced Science ( IF 14.3 ) Pub Date : 2020-07-08 , DOI: 10.1002/advs.202000465
Bo Song ₁ , Rongyuan Zhang _{1,

2} , Rong Hu ₁ , Xu Chen ₁ , Dongming Liu ₁ , Jiali Guo ₁ , Xiaotian Xu ₁ , Anjun Qin ₁ , Ben Zhong Tang _{1,

3}

Affiliation

Hyperbranched polymers constructed from CO₂ possess unique architectures and properties; however, they are difficult to prepare. In this work, CO₂‐based, hyperbranched poly(alkynoate)s (hb‐PAs) with high molecular weights and degrees of branching are facilely prepared under atmospheric pressure in only 3 h. Because hb‐PAs possess two types of ethynyl groups with different reactivities, they can undergo site‐selective, three‐step functionalizations with nearly 100% conversion in each step. Taking advantage of this unique feature, functional hb‐PAs with versatile properties are constructed that could be selectively tailored to contain hydrophilic oligo(ethylene glycol) chains in their branched chains, on their periphery, or both via tandem polymerizations. Hyperbranched polyprodrug amphiphiles with high drug loading content (44.3 wt%) are also generated, along with an artificial light‐harvesting system with high energy transfer efficiency (up to 92%) and white‐light‐emitting polymers. This work not only provides an efficient pathway to convert CO₂ into hyperbranched polymers, but also offers an effective platform for site‐selective multistep functionalizations toward functional polymeric materials.

中文翻译：

CO2基超支化聚炔酸酯的位点选择性多步功能化，形成功能性高分子材料

由CO ₂构建的超支化聚合物具有独特的结构和性能；然而，它们很难准备。在这项工作中，具有高分子量和支化度的基于CO _{2的超支化聚（炔酸酯）（hb-PA）在大气压下仅需3小时即可轻松制备。}由于 hb-PA 具有两种不同反应活性的乙炔基，因此它们可以进行位点选择性的三步官能化，每一步转化率接近 100%。利用这一独特的特征，构建了具有多种特性的功能性 hb-PA，可以选择性地定制其支链、外围或通过串联聚合在两者中包含亲水性低聚（乙二醇）链。还产生了具有高载药量（44.3 wt%）的超支化聚前药两亲物，以及具有高能量转移效率（高达 92%）的人工光捕获系统和白光发射聚合物。这项工作不仅提供了将CO ₂转化为超支化聚合物的有效途径，而且还为功能性聚合物材料的位点选择性多步功能化提供了有效的平台。

更新日期：2020-09-10

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