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The base-free multicomponent polymerization of elemental sulfur, difluoromethylene phosphobetaine and amines toward electron-deficient aromatic polythioureas† 单质硫、二氟亚甲基磷酸甜菜碱和胺在缺电子芳族聚硫脲中的无碱多组分聚合
IF 4.1 2区 化学 Q2 POLYMER SCIENCE Pub Date : 2025-02-20 DOI: 10.1039/d4py01387e
Yongjiang Yu , Wang Chen , Rongrong Hu , Ben Zhong Tang
Polythioureas are emerging materials with fascinating properties, such as self-healing and adhesion, high refractive indices, high dielectric constants, and heavy metal ion adsorption.With the increasing requirement for polymer structures and properties suiting a wide range of potential applications, versatile synthetic approaches are demanded to access a great diversity of polythiourea structures efficiently and economically. In this work, a commercially available difluorocarbene precursor, difluoromethylene phosphobetaine (PDFA), was selected to react with sulfur and electron-deficient aromatic amines to enable the efficient syntheses of electron-deficient polythioureas from amine monomers with low reactivity based on the high reactivity of a difluorothiocarbonyl intermediate. A one-pot catalyst-free multicomponent reaction of sulfur, PDFA and an amine was designed, which could take place efficiently in DMAc at 60 °C under nitrogen and was applicable for aromatic amines with both electron-donating and electron-withdrawing groups, producing thioureas in high yields (up to 93%). Most importantly, catalyst-free multicomponent polymerizations of sulfur, PDFA, and diamines were also developed in DMAc at 60 °C with commercially available monomers, showing high efficiency (Mws up to 65 900 g mol−1 and yields up to 99%) and wide monomer applicability, providing an efficient synthetic approach for syntheses of polythioureas. Moreover, these polythiourea thin films showed high refractive indices (n633 nm up to 1.8133), suggesting their potential application in optical devices.
聚硫脲是一种新兴材料,具有自愈和粘附、高光折射率、高介电常数、重金属离子吸附等令人着迷的特性。随着广泛的潜在应用对聚合物结构和性能的要求越来越高,需要多用途的合成方法来高效、经济地获得多种多样的聚硫脲结构。在这项工作中,选择了一种市售的二氟苯前体二氟乙烯磷酸甜菜碱(PDFA),与硫和缺电子芳香胺反应,通过二氟硫羰基中间体的高反应活性,以低反应活性的胺单体为原料,高效地合成了缺电子多硫脲。设计了一锅无催化剂的硫、PDFA和胺的多组分反应,该反应能在60℃氮气条件下在DMAc中高效反应,广泛适用于具有供电子和吸电子基团的芳香胺,产率高(78 ~ 93%)。最重要的是,在60℃的DMAc条件下,开发了硫、PDFA和二胺的无催化剂多组分聚合,条件温和,可获得三种单体,效率高(MwS高达65900 g/mol,产率高达99%),单体适用性广,为合成聚硫脲提供了一种高效的合成方法。此外,这些聚硫脲薄膜具有较高的光折射率(n633 nm ~ 1.8133),在光学器件中具有潜在的应用前景。
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引用次数: 0
Geometry-directed cyclisation within the transfer-dominated branching radical telomerisation of dimethacrylates† 二甲丙烯酸酯转移主导的分支自由基端粒化中的几何定向环化。
IF 4.1 2区 化学 Q2 POLYMER SCIENCE Pub Date : 2025-02-20 DOI: 10.1039/d4py01368a
Corinna Smith , Oliver B. Penrhyn-Lowe , Samuel Mckeating , Stephen Wright , Andrew B. Dwyer , Steve P. Rannard
The use of Transfer-dominated Branching Radical Telomerisation (TBRT) in the homopolymerisation of neopentyl glycol dimethacrylate has shown the formation of highly cyclised structures even at relatively highly concentrated reaction conditions. This is contrary to previous reports of the TBRT of unconstrained multi-vinyl taxogens and is the first indication of geometry directed cyclisation within the formation of branched polyesters via TBRT methods. Surprisingly, there was limited impact of increased reaction temperature on recovered samples. Dilution led to an expected increase in cyclisation, however, the recovered polymer samples are unprecedented in the extent of cyclisation and the reduction in the use of telogen required to suppress gelation and form soluble branched polymers.
转移主导的分支自由基端粒化(TBRT)在新戊二醇二甲基丙烯酸酯均聚合中的应用表明,即使在相对高浓度的反应条件下,也能形成高度环化的结构。这与之前关于无约束多乙烯基分类原的TBRT的报道相反,并且是通过TBRT方法在支化聚酯形成中的几何定向环化的第一个迹象。令人惊讶的是,增加反应温度对回收样品的影响有限。稀释导致预期的环化增加,然而,回收的聚合物样品在环化程度上是前所未有的,并且减少了抑制凝胶化和形成可溶性支化聚合物所需的止动剂的使用。
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引用次数: 0
An alkylthio side chain tuned the PM6 structure and elevated photovoltaic performance of ternary donor polymers† 烷基硫代侧链调节了PM6的结构,提高了三元给体聚合物†的光伏性能
IF 4.1 2区 化学 Q2 POLYMER SCIENCE Pub Date : 2025-02-20 DOI: 10.1039/d4py01152j
Pengzhi Guo , Jinye He , Junhong Liang , Tiantian Wang , Mingruo Li , Jianhong Wei , Wentao Miao , Zezhou Liang , Yuan Zhou , Junfeng Tong , Xunchang Wang , Chenglong Wang , Yangjun Xia
Modification of conjugated polymer skeletons using side chain engineering is important for the development of efficient conjugated donor polymers. In this work, alkylthio-substituted BDD units (SBDD) were introduced into the high-efficiency donor PM6 to construct a series of conjugated polymers (PBDB-TF-S5, PBDB-TF-S10 and PBDB-TF-S20, with the molar ratios of SBDD of 5%, 10%, and 20%, respectively), and the effect of the third component SBDD on the photovoltaic performance of organic solar cells (OSCs) was systematically investigated. First, we demonstrated that the highest occupied molecular orbital energy level (EHOMO) of polymers gradually decreases when the content of SBDD increases, which facilitates the obtainment of progressively higher open-circuit voltages (VOC) for the corresponding devices. Second, the detailed experimental results proved that OSCs based on PBDB-TF-S5:Y6 revealed a lower energy loss (Eloss), suitable degree of crystallinity, good miscibility with Y6, more balanced carrier mobilities and weaker charge recombination. Eventually, the power conversion efficiency (PCE) of the device based on PM6:Y6 (15.47%) was increased to 16.46% with a JSC of 25.68 mA cm−2, VOC of 0.861 V and fill factor (FF) of 74.45% with the help of an alkylthio side chain. This work provides a sufficient reference for optimizing the efficient donor polymer PM6 and confirms that PBDB-TF-S5 is a promising and efficient donor polymer for OSCs.
利用侧链工程对共轭聚合物骨架进行修饰对于开发高效共轭供体聚合物非常重要。本研究在高效给体 PM6 中引入了烷硫基取代的 BDD 单元(SBDD),构建了一系列共轭聚合物(PBDB-TF-S5、PBDB-TF-S10 和 PBDB-TF-S20,SBDD 的摩尔比分别为 5%、10% 和 20%),并系统研究了第三组分 SBDD 对有机太阳能电池(OSC)光电性能的影响。首先,我们证明了当 SBDD 的含量增加时,聚合物的最高占据分子轨道能级(EHOMO)会逐渐降低,这有利于相应器件获得逐渐升高的开路电压(VOC)。其次,详细的实验结果证明,基于 PBDB-TF-S5:Y6 的 OSC 具有更低的能量损耗(Eloss)、合适的结晶度、与 Y6 良好的相溶性、更均衡的载流子迁移率以及更弱的电荷重组。最终,在烷硫基侧链的帮助下,基于 PM6:Y6 的器件的功率转换效率(PCE)(15.47%)提高到了 16.46%,JSC 为 25.68 mA cm-2,VOC 为 0.861 V,填充因子(FF)为 74.45%。这项工作为优化高效供体聚合物 PM6 提供了充分的参考,并证实 PBDB-TF-S5 是一种很有前途的用于有机发光二极管的高效供体聚合物。
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引用次数: 0
Chemical modification of poly(isosorbide carbonate)-based copolymers with boronic acids and the ammonolysis of the modified copolymers† 硼酸对聚碳酸异山梨酯基共聚物的化学改性及改性共聚物的氨解反应
IF 4.1 2区 化学 Q2 POLYMER SCIENCE Pub Date : 2025-02-20 DOI: 10.1039/d4py01365d
Kazuaki Rikiyama , Akari Matsunami , Shunsuke Fujimata , Tatsuo Taniguchi , Daisuke Aoki
Here, the functionalization of bio-based polycarbonates by post-polymerization modification with boronic acids was demonstrated as an effective method for tuning the thermal and physical properties of original polymers without losing their original nature, i.e., the degradability into monomers and urea by ammonolysis. Poly(isosorbide carbonate)-based copolymers with hydroxy groups in the polymer main chain were modified using low-molecular-weight boronic acids and polymers containing boronic acids, respectively. The modifications significantly changed the glass transition temperature, solubility, and mechanical properties. In particular, the use of modifiers with two or more boronic acids noticeably varied the mobility of the polymer, resulting in cross-linked structures. All the modified polymers, including cross-linked polymers, were successfully degraded to monomers and urea by aqueous ammonia treatment. Thus, this study provides a design guideline to control the physical properties of PIC copolymers by balancing their stability as a polymer material and their degradability after use.
在本研究中,用硼酸进行聚合后改性的生物基聚碳酸酯功能化被证明是一种有效的方法,可以调整原始聚合物的热学和物理性质,而不失去其原始性质,即氨解分解成单体和尿素的可降解性。采用硼酸对主链上带有羟基的聚碳酸异山梨酯基共聚物进行了改性。作为改性剂的硼酸分为低分子量硼酸和含聚合物硼酸两类。这些改性明显地影响了聚合物的热性能和机械性能。此外,在以碳酸异山梨酯为基础的共聚物和含有两种或两种以上硼酸的改性剂中,在羟基之间构建硼酯会显著改变主链的迁移率,从而产生交联结构。改性后的聚合物,包括交联聚合物,在氨水处理下成功地分解为单体和尿素。因此,本研究展示了一种平衡材料稳定性和使用后可降解性的设计准则。
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引用次数: 0
Nickel-catalyzed reductive cross-coupling polymerization of dithiosulfonates and dibromides for the synthesis of polythioethers† 镍催化二硫代磺酸盐和二溴化物的还原交叉耦合聚合反应以合成聚硫醚
IF 4.1 2区 化学 Q2 POLYMER SCIENCE Pub Date : 2025-02-20 DOI: 10.1039/d4py01374c
Xin Yi , Hao Zeng , Chunyu Chen , Ziwei Luo , Ningyu Li , Junyang Cen , Yuening Pan , Ze Li , Pinglu Zhang
The incorporation of heteroatoms in polymeric structures may promote some physical or chemical properties of polymers. Polythioethers are widely used as functional materials and are of great importance in both academia and industry. In conventional synthetic strategies, thiols with unpleasant odor are typically used as the starting materials. Here, we disclose a novel thiolation polymerization using dithiosulfonate as a surrogate thiolation reagent, which was applied with aliphatic dibromide in a nickel catalyzed reductive cross-coupling polymerization for the synthesis of polythioethers. An array of polythioethers were prepared with well-defined structures and decent thermal properties. Moreover, the refractive index of these polythioethers could reach up to 1.72, indicating a potential application as optical materials. This work establishes a novel thiolation polymerization toward polythioethers and starts an avenue for their applications.
杂原子在聚合物结构中的掺入可以提高聚合物的某些物理或化学性能。聚硫醚是一种用途广泛的功能材料,在学术界和工业界都具有重要意义。在传统的合成策略中,通常使用具有难闻气味的硫醇作为起始原料。本研究以二硫代磺酸盐为代硫代试剂,与脂肪族二溴化物进行镍催化的交叉偶联还原聚合,合成了一种新型硫代醚。制备了一系列结构明确、热性能良好的聚硫醚。此外,这些聚硫醚的折射率可达1.72,显示出作为光学材料的潜在应用。本研究建立了一种新型的聚硫醚硫基化聚合方法,为聚硫醚的应用开辟了新的途径
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引用次数: 0
Self-driving laboratory platform for many-objective self-optimisation of polymer nanoparticle synthesis with cloud-integrated machine learning and orthogonal online analytics† 基于云集成机器学习和正交在线分析的多目标自优化聚合物纳米颗粒合成的自动驾驶实验室平台。
IF 4.1 2区 化学 Q2 POLYMER SCIENCE Pub Date : 2025-02-13 DOI: 10.1039/d5py00123d
Stephen T. Knox , Kai E. Wu , Nazrul Islam , Roisin O'Connell , Peter M. Pittaway , Kudakwashe E. Chingono , John Oyekan , George Panoutsos , Thomas W. Chamberlain , Richard A. Bourne , Nicholas J. Warren
The application of artificial intelligence and machine learning is revolutionising the chemical industry, with the ability to automate and self-optimise reactions facilitating a step change in capability. Unlike small-molecules, polymer nanoparticles require navigation of a more complex parameter space to access the desired performance. In addition to the chemical reaction, it is desirable to optimise the polymer molecular weight distribution, particle size and polydispersity index. To solve this many-objective optimisation problem, a self-driving laboratory is constructed which synthesises and characterises polymer nanoparticles (incorporating NMR spectroscopy, gel permeation chromatography and dynamic light scattering). This facilitates the autonomous exploration of parameter space with programmable screens or AI driven optimisation campaigns via a cloud-based framework. The RAFT polymerisation of diacetone acrylamide mediated by a poly(dimethylacrylamide) macro-CTA was optimised to maximise monomer conversion, minimise molar mass dispersity, and target 80 nm particles with minimised polydispersity index. A full-factorial screen between 6- and 30-minutes residence time, between 68 and 80 °C and between 100 and 600 for the [monomer] : [CTA] ratio enabled mapping of the reaction space. This facilitated in-silico simulations using a range of algorithms – Thompson sampling efficient multi-objective optimisation (TSEMO), radial basis function neural network/reference vector evolutionary algorithm (RBFNN/RVEA) and multi objective particle swarm optimisation, hybridised with an evolutionary algorithm (EA-MOPSO), which were then applied to in-lab optimisations. This approach accounts for an unprecedented number of objectives for closed-loop optimisation of a synthetic polymerisation; and enabled the use of algorithms operated from different geographical locations to the reactor platform.
人工智能和机器学习的应用正在彻底改变化学工业,其自动化和自我优化反应的能力促进了能力的逐步变化。与小分子不同,聚合物纳米颗粒需要导航更复杂的参数空间才能获得所需的性能。除了化学反应外,还需要优化聚合物的分子量分布、粒径和多分散性指数。为了解决这一多目标优化问题,我们建立了一个自动驾驶实验室,用于合成和表征聚合物纳米颗粒(结合核磁共振波谱、凝胶渗透色谱和动态光散射)。这有助于通过基于云的框架使用可编程屏幕或AI驱动的优化活动自主探索参数空间。通过优化聚(二甲基丙烯酰胺)宏观cta介导的二丙酮丙烯酰胺RAFT聚合,以最大限度地提高单体转化率,最小化摩尔质量分散性,并以最小的多分散性指数靶向80 nm颗粒。对于[单体]:[CTA]比例,在6- 30分钟停留时间、68 - 80°C和100 - 600°C之间进行全因子筛选,可以绘制反应空间。这有助于使用一系列算法进行计算机模拟-汤普森采样高效多目标优化(TSEMO),径向基函数神经网络/参考向量进化算法(RBFNN/RVEA)和多目标粒子群优化,混合进化算法(EA-MOPSO),然后将其应用于实验室优化。这种方法为合成聚合的闭环优化提供了前所未有的目标数量;并且可以使用从不同地理位置运行到反应堆平台的算法。
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引用次数: 0
Photoactive methylene blue-functionalized polymer for antimicrobial activation under red light† 光活性亚甲基蓝功能化聚合物在红光下的抗菌活性
IF 4.1 2区 化学 Q2 POLYMER SCIENCE Pub Date : 2025-02-13 DOI: 10.1039/d5py00068h
Zeyu Shao , Huanli Sun , Edgar H. H. Wong
This study presents the synthesis of a novel methylene blue acrylamide monomer and its incorporation into a diblock copolymer, , which exhibits potent antimicrobial activity against Gram-negative (Escherichia coli, Pseudomonas aeruginosa) and Gram-positive (Staphylococcus aureus) bacteria when photoirradiated under red light (λ = 630 nm). Mechanistic investigations revealed that singlet oxygen species, and not superoxides, are responsible for the antimicrobial activity, most likely by damaging cellular components such as proteins and DNA. The advantage of using red light as an external trigger because of its ability to penetrate skin and tissue is demonstrated here, where is still active against E. coli when irradiated through a cover of chicken skin. In terms of biocompatibility, is, significantly, 130 times more biocompatible than the original methylene blue dye. Overall, this study demonstrates the efficient modification of a red light-active photosensitiser into an antimicrobial macromolecule with improved biological properties for potential photodynamic applications in healthcare.
本研究介绍了一种新型亚甲基蓝丙烯酰胺单体的合成及其在二嵌段共聚物 PolyMB 中的应用,该单体在红光(λ = 630 纳米)照射下对革兰氏阴性菌(大肠杆菌、绿脓杆菌)和革兰氏阳性菌(金黄色葡萄球菌)具有很强的抗菌活性。机理研究表明,单线态氧而不是超氧化物是抗菌活性的原因,很可能是通过破坏蛋白质和 DNA 等细胞成分。由于红光能够穿透皮肤和组织,因此使用红光作为外部触发器的优势在这里得到了证明,当红光透过鸡皮照射时,PolyMB 对大肠杆菌仍有活性。在生物相容性方面,PolyMB 的生物相容性比原来的亚甲基蓝染料高出 130 倍。总之,这项研究表明,红光活性光敏剂被有效地改性成了一种具有更好生物特性的抗菌大分子,有望应用于医疗保健领域的光动力疗法。
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引用次数: 0
Preparation of phenyl-substituted open-cage silsesquioxane-pendant polysiloxanes and their thermal and optical properties† 苯基取代开笼型硅氧烷悬垂型聚硅氧烷的制备及其热光学性能
IF 4.1 2区 化学 Q2 POLYMER SCIENCE Pub Date : 2025-02-13 DOI: 10.1039/d4py01460j
Miku Kosaka , Kenji Kanaori , Hiroaki Imoto , Kensuke Naka
We prepared phenyl-substituted corner-opened type polyhedral oligomeric silsesquioxanes (CO-POSSs) bearing tris(dimethoxysilyl)-groups with variable linker lengths at the opening vertex; that is, tris(dimethoxysilyl-ethyl-dimethylsiloxy)- and tris(dimethoxysilyl-propylthioethyl-dimethylsiloxy)-heptaphenyl-substituted CO-POSSs ( and ). Optically transparent free-standing films of phenyl-substituted open-cage silsesquioxane-pendant polysiloxanes () were prepared by optimizing the sol–gel reaction conditions for . Polycondensation of afforded an optically transparent and flexible phenyl-substituted CO-POSS-pendant polysiloxane film (). The polycondensations of and were fully completed even at 50 °C for 6 h under vacuum. 29Si cross-polarization magic angle spinning (CP-MAS) NMR analysis suggests that the films included cyclotrisiloxane (D3) and linear siloxane (Dlinear) structures. The effects of the polysiloxane structures on the thermal and mechanical properties were studied. The highest temperature at which the sample lost 5 wt% of the original mass (Td5) under N2 (381 °C) was obtained for , even though it contained a flexible linker unit. The predominant linear siloxane structures may provide increase higher thermal stability. The UV-vis spectra of the resulting transparent films were mostly unchanged even after six days of exposure to UV irradiation in air. The present study shows that phenyl-substituted CO-POSS-pendant polysiloxanes represent alternative UV-resistant, optically transparent materials with higher heat resistance.
我们制备了带有三(二甲氧基硅基)基团的苯基取代角开型多面体低聚硅氧烷(CO-POSSs),在开口顶点具有可变连接长度;即三(二甲氧基-乙基-二甲基硅氧烷)-和三(二甲氧基-丙基-硫乙基-二甲基硅氧烷)-七苯基取代CO-POSSs (Ph-H和Ph-V)。通过优化Ph-H的溶胶-凝胶反应条件,制备了苯基取代开笼型硅氧烷悬垂型聚硅氧烷(PolyPh-H)的光学透明独立薄膜。Ph-V的缩聚得到光学透明和柔性的苯基取代co - poss悬垂聚硅氧烷薄膜(PolyPh-V)。在真空条件下,Ph-H和Ph-V的缩聚反应在50℃下持续6 h也完全完成。29Si交叉极化魔角自旋(CP-MAS)核磁共振分析表明,膜包括环三硅氧烷(D3)和线性硅氧烷(Dlinear)结构。研究了聚硅氧烷结构对材料热性能和力学性能的影响。在N2(381˚C)条件下,PolyPh-V即使含有柔性连接单元,也能达到样品损失原始质量(Td5) 5wt %的最高温度。主要的线性硅氧烷结构可以提供更高的热稳定性。即使在空气中紫外线照射6天后,所得到的透明薄膜的紫外可见光谱也基本没有变化。本研究表明,苯基取代的co - poss悬垂型聚硅氧烷是具有更高耐热性的抗紫外线、光学透明的替代材料。
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引用次数: 0
Chain folding of carbazole-donor containing polymers via a two-point interaction with naphthalene monoimide-based acceptors† 含咔唑给体聚合物与萘基单酰亚胺受体两点相互作用的链折叠
IF 4.1 2区 化学 Q2 POLYMER SCIENCE Pub Date : 2025-02-13 DOI: 10.1039/d4py01234h
Arun Kumar Gayen , S. Ramakrishnan
Linear polymers carrying electron-rich dialkoxy-carbazole (DACBZ) units linked by flexible oligooxyethylene segments were induced into a zigzag folded state by an external folding agent, which carries two subunits: an electron-deficient dinitro-naphthalene monoimide (NMI(NO2)2) acceptor and an ammonium perchlorate unit. The ammonium unit of the folding agent interacts with the backbone oxyethylene segment and, in turn, brings two adjacent CBZ moieties on either side of the electron-deficient NMI(NO2)2 unit of the folding agent to induce a charge-transfer (CT) interaction; this two-point interaction was shown to be crucial for the stability of the pleated chain structure. An interesting, and potentially useful, feature of this system is the possibility to incorporate a pendant unit at the carbazole nitrogen (N) site; a variety of segments, such as linear, branched, or chiral alkyl chains, were installed to examine if the folding of the chain is influenced by the nature of the pendant segment. The formation of the pleated structure was studied by 1H-NMR and UV-visible titration experiments; both these clearly revealed the presence of strong charge transfer (CT) interactions between the donor (D) and acceptor (A) units. The length of the spacer segment linking the NMI(NO2)2 acceptor unit and the ammonium group in the folding agent was varied, and it was seen that a 3-carbon spacer yielded the strongest cooperative interaction. To translate the folded conformation into the solid state, a solution of the donor polymer and the most efficient acceptor, taken in a 1 : 1 (D:A) ratio, was cast on a quartz plate. UV-visible studies of the film revealed the retention of the CT band; more importantly, immersing the film into an aqueous NaHCO3 solution neutralized the ammonium group to generate the free amine. This caused an unexpected deepening of the colour, along with a hypsochromic shift of the CT band, suggesting that the free amine acceptor readjusts within the film to improve the CT interaction, exploiting the newly garnered freedom after de-coordination with the oligooxyethylene segment.
线性聚合物携带由柔性低聚氧乙烯段连接的富电子二氧基咔唑单元,通过外部折叠剂强制进入折叠状态,该折叠剂携带两个亚基:缺乏电子的二硝基萘单亚胺(NMI(NO2)2)核和与其相连的铵基。折叠剂的铵基与主链氧乙烯段建立起podpodtype相互作用,在缺电子的NMI(NO2)2基两侧引入两个相邻的咔唑(CBZ)基团,诱导电荷转移(CT)相互作用;这两点相互作用对褶皱链结构的稳定性起着至关重要的作用。该体系的一个有趣的特点是在咔唑氮(N)位点上加入一个垂坠基团的可能性;安装了各种链段,如线性、支链或手性烷基链,以检查链的折叠是否受到垂链段的性质的影响。通过1H-NMR和紫外可见滴定实验研究了褶皱结构的形成;两者都清楚地揭示了供体(D)和受体(a)单元之间存在强电荷转移(CT)相互作用。折叠剂中连接NMI(NO2)2受体单元和铵基的间隔段长度不同,3碳间隔段的协同作用最强。为了将折叠构象转化为固体,将供体聚合物和最有效的受体按1:1 (D: a)的比例配制成溶液,浇铸在石英板上。紫外可见研究显示CT带保留;更重要的是,将薄膜浸入NaHCO3水溶液中,使铵基中和,生成游离胺。这导致了意想不到的颜色加深,以及CT波段的低色移,这表明游离胺受体在膜内重新调整以改善CT相互作用,不受低聚氧乙烯段配位的限制。
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引用次数: 0
Scalable access to functional nylon 6 via ring-opening copolymerization of biobased δ-valerolactam with ε-caprolactam† 生物基δ-戊内酯与ε-己内酰胺开环共聚制备功能性尼龙6
IF 4.1 2区 化学 Q2 POLYMER SCIENCE Pub Date : 2025-02-13 DOI: 10.1039/d4py01406e
Yahui Mao , Maosheng Li , Youhua Tao
Copolymerization of ε-caprolactam with functional lactam monomers was an effective strategy to introduce pendent substituents into nylon 6, which might endow these materials with improved processing properties, solubility, elasticity, and adhesion, while not compromising their inherent thermal and mechanical properties. However, the scalable synthesis of functional lactams remained extremely difficult due to their high raw material cost and/or cumbersome synthesis steps, making it difficult to meet the enormous market demand for nylon 6 materials. Herein, we introduced a new biobased δ-valerolactam monomer (3-(dimethylamino)-piperidone, ) derived from ornithine, which could efficiently copolymerize with ε-caprolactam to deliver functional nylon 6 polymers. Both monomer and copolymer synthesis proved straightforward and readily scalable. The resulting nylon 6 polymers exhibited comparable properties relative to their well-known commercial counterpart, including high thermal stability and crystallinity, suggesting that the incorporation of exerted minimal influence on the polymers’ inherent properties. Remarkably, the pendant dimethylamino group at the polyamide backbone could further convert into various functional structures by reacting with electrophiles, thereby providing a simple and versatile platform for the preparation of diverse functional nylon 6 materials towards broader applications.
ε-己内酰胺与功能内酰胺单体的共聚是在尼龙6中引入悬置取代基的有效策略,这可能会使这些材料具有更好的加工性能,溶解度,弹性和附着力,同时不影响其固有的热学和力学性能。然而,由于原料成本高和/或合成步骤繁琐,功能性内酰胺的规模化合成仍然非常困难,难以满足市场对尼龙6材料的巨大需求。本文中,我们引入了一种新的从鸟氨酸衍生的生物基δ-戊内酯单体(3-(二甲氨基)-哌啶酮,M1),该单体可以与ε-己内酰胺有效共聚,生成功能性尼龙6聚合物。单体和共聚物的合成都证明是简单的,易于扩展。由此产生的尼龙6聚合物表现出与其知名的商业对应物相当的性能,包括高热稳定性和结晶度,这表明M1的加入对聚合物的固有性能影响最小。值得注意的是,聚酰胺主链上的二甲氨基可以通过与亲电试剂反应进一步转化为各种功能结构,从而为制备各种功能尼龙6材料提供了一个简单而通用的平台,具有更广泛的应用前景。
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Polymer Chemistry
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