ACS Macro Letters最新文献_第5页

Water Droplet Templating Technique to Design Three-Dimensionally Ordered Porous Structures of Polymer Film

IF 5.1

ACS Macro Letters Pub Date : 2025-01-24 DOI: 10.1021/acsmacrolett.4c0075310.1021/acsmacrolett.4c00753

Wanxin Peng, Sen Lin, Feng Yang, Ya Cao, Ming Xiang and Tong Wu*,

{"title":"Water Droplet Templating Technique to Design Three-Dimensionally Ordered Porous Structures of Polymer Film","authors":"Wanxin Peng, Sen Lin, Feng Yang, Ya Cao, Ming Xiang and Tong Wu*, ","doi":"10.1021/acsmacrolett.4c0075310.1021/acsmacrolett.4c00753","DOIUrl":"https://doi.org/10.1021/acsmacrolett.4c00753https://doi.org/10.1021/acsmacrolett.4c00753","url":null,"abstract":"We developed a unique water droplet templating method to fabricate polymer films with three-dimensionally ordered porous structures. This technique is based on a polymer/solvent/H2O ternary system, and the key is to choose a volatile and hydrophobic solvent that is slightly miscible with H2O. With the fast evaporation of the solvent, water droplets separate from the casting solution and condense from the air to act as pore templates inside the film and on the surface, respectively. According to this law, nitrocellulose (NC) films were produced from the NC/methyl acetate (MA)/H2O system in which the solubility of H2O in MA is 8.1 wt %. By modulating the solution concentration (density) from 3% to 9% NC, the distribution of separated water droplets (pores) in the solution can be flexibly controlled from sinking to floating. On the other hand, substantial ordered honeycomb pores, originated from condensed water droplets, distribute uniformly on the surface of NC films. This water droplet templating technique can be extensively applied in various polymer films, providing an effective pathway to designing polymer films with a desirable porous structure and diverse functionalities.","PeriodicalId":18,"journal":{"name":"ACS Macro Letters","volume":"14 2","pages":"155–160 155–160"},"PeriodicalIF":5.1,"publicationDate":"2025-01-24","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143428389","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 0

Water Droplet Templating Technique to Design Three-Dimensionally Ordered Porous Structures of Polymer Film

IF 5.8

ACS Macro Letters Pub Date : 2025-01-24 DOI: 10.1021/acsmacrolett.4c00753

Wanxin Peng, Sen Lin, Feng Yang, Ya Cao, Ming Xiang, Tong Wu

{"title":"Water Droplet Templating Technique to Design Three-Dimensionally Ordered Porous Structures of Polymer Film","authors":"Wanxin Peng, Sen Lin, Feng Yang, Ya Cao, Ming Xiang, Tong Wu","doi":"10.1021/acsmacrolett.4c00753","DOIUrl":"https://doi.org/10.1021/acsmacrolett.4c00753","url":null,"abstract":"We developed a unique water droplet templating method to fabricate polymer films with three-dimensionally ordered porous structures. This technique is based on a polymer/solvent/H2O ternary system, and the key is to choose a volatile and hydrophobic solvent that is slightly miscible with H2O. With the fast evaporation of the solvent, water droplets separate from the casting solution and condense from the air to act as pore templates inside the film and on the surface, respectively. According to this law, nitrocellulose (NC) films were produced from the NC/methyl acetate (MA)/H2O system in which the solubility of H2O in MA is 8.1 wt %. By modulating the solution concentration (density) from 3% to 9% NC, the distribution of separated water droplets (pores) in the solution can be flexibly controlled from sinking to floating. On the other hand, substantial ordered honeycomb pores, originated from condensed water droplets, distribute uniformly on the surface of NC films. This water droplet templating technique can be extensively applied in various polymer films, providing an effective pathway to designing polymer films with a desirable porous structure and diverse functionalities.","PeriodicalId":18,"journal":{"name":"ACS Macro Letters","volume":"108 1","pages":""},"PeriodicalIF":5.8,"publicationDate":"2025-01-24","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143027027","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 0

Sequence-Dependent Liquid Crystalline Ordering of Gapped DNA

IF 5.1

ACS Macro Letters Pub Date : 2025-01-22 DOI: 10.1021/acsmacrolett.4c0078810.1021/acsmacrolett.4c00788

Sineth G. Kodikara, James T. Gleeson, Antal Jakli, Samuel Sprunt* and Hamza Balci*,

引用次数: 0

Sequence-Dependent Liquid Crystalline Ordering of Gapped DNA 间隙DNA的序列依赖液晶排序

IF 5.8

ACS Macro Letters Pub Date : 2025-01-22 DOI: 10.1021/acsmacrolett.4c00788

Sineth G. Kodikara, James T. Gleeson, Antal Jakli, Samuel Sprunt, Hamza Balci

引用次数: 0

A Pseudo-Block Copolymerization Access to Cyclic Alternating Copolymers through Segment-Selective Transesterification

IF 5.1

ACS Macro Letters Pub Date : 2025-01-21 DOI: 10.1021/acsmacrolett.4c0077210.1021/acsmacrolett.4c00772

Hongxuan Zhu, Fengzhuang Liu, Hongxin Zhang* and Junpeng Zhao*,

{"title":"A Pseudo-Block Copolymerization Access to Cyclic Alternating Copolymers through Segment-Selective Transesterification","authors":"Hongxuan Zhu, Fengzhuang Liu, Hongxin Zhang* and Junpeng Zhao*, ","doi":"10.1021/acsmacrolett.4c0077210.1021/acsmacrolett.4c00772","DOIUrl":"https://doi.org/10.1021/acsmacrolett.4c00772https://doi.org/10.1021/acsmacrolett.4c00772","url":null,"abstract":"Efficient synthesis of cyclic polymers remains a frontier challenge. We report here that macromolecular transesterification during a pseudoblock copolymerization process can be utilized for such a purpose. Organobase-catalyzed ring-opening alternating copolymerization of 3,4-dihydrocoumarin and epoxide is conducted with four-armed poly(ethylene oxide) (PEO) as a macroinitiator. Intramolecular transesterification (backbiting) occurs selectively on the newly formed polyester segments. The disconnected cyclic alternating copolymers can be easily isolated by precipitation owing to their substantial solubility difference from the PEO-containing acyclic parts. The obtained cyclic alternating copolymers exhibit low dispersity (<1.2) and a molar mass of around 3 kg mol–1, irrespective of the monomer-to-initiator feed ratio, indicating thermodynamic control over the ring size. The macrocyclic structure is confirmed by both mass spectroscopy and microscopic visualization and then utilized to prepare cyclic-brush terpolymer by thiol–ene modification, followed by graft polymerization of propylene oxide.","PeriodicalId":18,"journal":{"name":"ACS Macro Letters","volume":"14 2","pages":"142–148 142–148"},"PeriodicalIF":5.1,"publicationDate":"2025-01-21","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143428329","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 0

A Pseudo-Block Copolymerization Access to Cyclic Alternating Copolymers through Segment-Selective Transesterification 通过段选择性酯交换反应获得环交替共聚物的伪嵌段共聚

IF 5.8

ACS Macro Letters Pub Date : 2025-01-21 DOI: 10.1021/acsmacrolett.4c00772

Hongxuan Zhu, Fengzhuang Liu, Hongxin Zhang, Junpeng Zhao

{"title":"A Pseudo-Block Copolymerization Access to Cyclic Alternating Copolymers through Segment-Selective Transesterification","authors":"Hongxuan Zhu, Fengzhuang Liu, Hongxin Zhang, Junpeng Zhao","doi":"10.1021/acsmacrolett.4c00772","DOIUrl":"https://doi.org/10.1021/acsmacrolett.4c00772","url":null,"abstract":"Efficient synthesis of cyclic polymers remains a frontier challenge. We report here that macromolecular transesterification during a pseudoblock copolymerization process can be utilized for such a purpose. Organobase-catalyzed ring-opening alternating copolymerization of 3,4-dihydrocoumarin and epoxide is conducted with four-armed poly(ethylene oxide) (PEO) as a macroinitiator. Intramolecular transesterification (backbiting) occurs selectively on the newly formed polyester segments. The disconnected cyclic alternating copolymers can be easily isolated by precipitation owing to their substantial solubility difference from the PEO-containing acyclic parts. The obtained cyclic alternating copolymers exhibit low dispersity (<1.2) and a molar mass of around 3 kg mol–1, irrespective of the monomer-to-initiator feed ratio, indicating thermodynamic control over the ring size. The macrocyclic structure is confirmed by both mass spectroscopy and microscopic visualization and then utilized to prepare cyclic-brush terpolymer by thiol–ene modification, followed by graft polymerization of propylene oxide.","PeriodicalId":18,"journal":{"name":"ACS Macro Letters","volume":"45 1","pages":""},"PeriodicalIF":5.8,"publicationDate":"2025-01-21","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142992593","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 0

Strategy for Fabricating Multiple-Shape Memory Polymeric Materials Based on Solid State Mixing

IF 5.1

ACS Macro Letters Pub Date : 2025-01-12 DOI: 10.1021/acsmacrolett.4c0060110.1021/acsmacrolett.4c00601

Salim-Ramy Merouani, Roman Kulagin, Vladislav Bondarenko, Ramin Hosseinnezhad, Fahmi Zaïri and Iurii Vozniak*,

{"title":"Strategy for Fabricating Multiple-Shape Memory Polymeric Materials Based on Solid State Mixing","authors":"Salim-Ramy Merouani, Roman Kulagin, Vladislav Bondarenko, Ramin Hosseinnezhad, Fahmi Zaïri and Iurii Vozniak*, ","doi":"10.1021/acsmacrolett.4c0060110.1021/acsmacrolett.4c00601","DOIUrl":"https://doi.org/10.1021/acsmacrolett.4c00601https://doi.org/10.1021/acsmacrolett.4c00601","url":null,"abstract":"Traditionally, multiple shape memory polymers (multiple-SMPs) are created by forming either immiscible blends with high phase continuity (cocontinuous or multilayer phase morphology) or miscible blends that exhibit compositional heterogeneity at the nanoscale. Here, a new strategy for the fabrication of multiple-SMPs is proposed. It consists of the possibility of homogeneous mixing of immiscible polymers in the solid state under high pressure and shear deformation conditions. The blends formed in this way exhibit homogeneity of mixing down to the nanoscale, up to 40–95 nm. The transition from immiscible to miscible blends leads to an improvement not only in shape memory but also in the mechanical performance of the blends formed. Polypropylene (PP) and polystyrene (PS) were selected as pairs of immiscible polymers. The method of solid phase mixing is high pressure torsion (HPT). It was shown that the HPT-processed 50% PP/50% PS blend is able to exhibit an excellent triple shape memory effect (shape fixation of ∼94–95%, and recovery of ∼85–95%) with widely tunable (low and high) transition temperatures.","PeriodicalId":18,"journal":{"name":"ACS Macro Letters","volume":"14 2","pages":"129–134 129–134"},"PeriodicalIF":5.1,"publicationDate":"2025-01-12","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://pubs.acs.org/doi/epdf/10.1021/acsmacrolett.4c00601","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143428245","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"OA","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 0

Reversible Thixotropic Rheological Properties of Graphene-Incorporated Epoxy Inks for Self-Standing 3D Printing 用于自立式三维打印的石墨烯环氧油墨的可逆触变流变特性

IF 5.1

ACS Macro Letters Pub Date : 2025-01-12 DOI: 10.1021/acsmacrolett.4c0076510.1021/acsmacrolett.4c00765

Hanna Sun, Uiseok Hwang, Soochan Kim, Jaeuk Sung, Taesung Kim, Jonghwan Suhr, In-Kyung Park* and Jae-Do Nam*,

{"title":"Reversible Thixotropic Rheological Properties of Graphene-Incorporated Epoxy Inks for Self-Standing 3D Printing","authors":"Hanna Sun, Uiseok Hwang, Soochan Kim, Jaeuk Sung, Taesung Kim, Jonghwan Suhr, In-Kyung Park* and Jae-Do Nam*, ","doi":"10.1021/acsmacrolett.4c0076510.1021/acsmacrolett.4c00765","DOIUrl":"https://doi.org/10.1021/acsmacrolett.4c00765https://doi.org/10.1021/acsmacrolett.4c00765","url":null,"abstract":"As three-dimensional (3D) printing has emerged as a new manufacturing technology, the demand for high-performance 3D printable materials has increased to ensure broad applicability in various load-bearing structures. In particular, the thixotropic properties of materials, which allow them to flow under applied external forces but resist flowing otherwise, have been reported to enable rapid and high-resolution printing owing to their self-standing and easily processable characteristics. In this context, graphene nanosheets exhibit unique π–π stacking interactions between neighboring sheets, likely imparting self-standing capability to low-viscosity inks. Herein, we develop a thermally curable graphene-incorporated epoxy ink system that exhibits shear-thinning characteristics and upright standing capability owing to its high static yield stress (∼1,680 Pa). The reversible liquid-to-solid phase transition of the composite ink, absent in the pristine epoxy ink, is clearly identified by its viscoelastic properties and dynamic yield stress. This thixotropic composite ink enables the continuous filament printing of 10 stacked layers without the spreading of injected filaments. Significantly, the 3D-printed composite structure, post-thermal curing, exhibits robust structural integrity and is free from weld lines or voids at the stacked interfaces. Combined with the clearly elucidated processing–structure–property relationships of the ink system, our results highlight its potential for a wide spectrum of applications.","PeriodicalId":18,"journal":{"name":"ACS Macro Letters","volume":"14 2","pages":"135–141 135–141"},"PeriodicalIF":5.1,"publicationDate":"2025-01-12","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143428679","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 0

Reversible Thixotropic Rheological Properties of Graphene-Incorporated Epoxy Inks for Self-Standing 3D Printing 石墨烯环氧树脂墨水的可逆触变流变特性

IF 5.8

ACS Macro Letters Pub Date : 2025-01-12 DOI: 10.1021/acsmacrolett.4c00765

Hanna Sun, Uiseok Hwang, Soochan Kim, Jaeuk Sung, Taesung Kim, Jonghwan Suhr, In-Kyung Park, Jae-Do Nam

{"title":"Reversible Thixotropic Rheological Properties of Graphene-Incorporated Epoxy Inks for Self-Standing 3D Printing","authors":"Hanna Sun, Uiseok Hwang, Soochan Kim, Jaeuk Sung, Taesung Kim, Jonghwan Suhr, In-Kyung Park, Jae-Do Nam","doi":"10.1021/acsmacrolett.4c00765","DOIUrl":"https://doi.org/10.1021/acsmacrolett.4c00765","url":null,"abstract":"As three-dimensional (3D) printing has emerged as a new manufacturing technology, the demand for high-performance 3D printable materials has increased to ensure broad applicability in various load-bearing structures. In particular, the thixotropic properties of materials, which allow them to flow under applied external forces but resist flowing otherwise, have been reported to enable rapid and high-resolution printing owing to their self-standing and easily processable characteristics. In this context, graphene nanosheets exhibit unique π–π stacking interactions between neighboring sheets, likely imparting self-standing capability to low-viscosity inks. Herein, we develop a thermally curable graphene-incorporated epoxy ink system that exhibits shear-thinning characteristics and upright standing capability owing to its high static yield stress (∼1,680 Pa). The reversible liquid-to-solid phase transition of the composite ink, absent in the pristine epoxy ink, is clearly identified by its viscoelastic properties and dynamic yield stress. This thixotropic composite ink enables the continuous filament printing of 10 stacked layers without the spreading of injected filaments. Significantly, the 3D-printed composite structure, post-thermal curing, exhibits robust structural integrity and is free from weld lines or voids at the stacked interfaces. Combined with the clearly elucidated processing–structure–property relationships of the ink system, our results highlight its potential for a wide spectrum of applications.","PeriodicalId":18,"journal":{"name":"ACS Macro Letters","volume":"29 1","pages":""},"PeriodicalIF":5.8,"publicationDate":"2025-01-12","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142968374","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 0

Strategy for Fabricating Multiple-Shape Memory Polymeric Materials Based on Solid State Mixing 基于固态混合的多形状记忆聚合物材料制备策略

IF 5.8

ACS Macro Letters Pub Date : 2025-01-12 DOI: 10.1021/acsmacrolett.4c00601

Salim-Ramy Merouani, Roman Kulagin, Vladislav Bondarenko, Ramin Hosseinnezhad, Fahmi Zaïri, Iurii Vozniak

{"title":"Strategy for Fabricating Multiple-Shape Memory Polymeric Materials Based on Solid State Mixing","authors":"Salim-Ramy Merouani, Roman Kulagin, Vladislav Bondarenko, Ramin Hosseinnezhad, Fahmi Zaïri, Iurii Vozniak","doi":"10.1021/acsmacrolett.4c00601","DOIUrl":"https://doi.org/10.1021/acsmacrolett.4c00601","url":null,"abstract":"Traditionally, multiple shape memory polymers (multiple-SMPs) are created by forming either immiscible blends with high phase continuity (cocontinuous or multilayer phase morphology) or miscible blends that exhibit compositional heterogeneity at the nanoscale. Here, a new strategy for the fabrication of multiple-SMPs is proposed. It consists of the possibility of homogeneous mixing of immiscible polymers in the solid state under high pressure and shear deformation conditions. The blends formed in this way exhibit homogeneity of mixing down to the nanoscale, up to 40–95 nm. The transition from immiscible to miscible blends leads to an improvement not only in shape memory but also in the mechanical performance of the blends formed. Polypropylene (PP) and polystyrene (PS) were selected as pairs of immiscible polymers. The method of solid phase mixing is high pressure torsion (HPT). It was shown that the HPT-processed 50% PP/50% PS blend is able to exhibit an excellent triple shape memory effect (shape fixation of ∼94–95%, and recovery of ∼85–95%) with widely tunable (low and high) transition temperatures.","PeriodicalId":18,"journal":{"name":"ACS Macro Letters","volume":"26 1","pages":""},"PeriodicalIF":5.8,"publicationDate":"2025-01-12","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142962679","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 0