Macromolecular Chemistry and Physics最新文献_第8页

Tuning Interfacial Characteristics of Epoxy Composites Towards Simultaneous High Thermal and Dielectric Properties

IF 2.5 4区化学

Macromolecular Chemistry and Physics Pub Date : 2024-11-03 DOI: 10.1002/macp.202400260

Chengzhi Zhong, Yang Feng, Bin Zhou, Peiyan Liu, Yi Zhao, Shengtao Li

{"title":"Tuning Interfacial Characteristics of Epoxy Composites Towards Simultaneous High Thermal and Dielectric Properties","authors":"Chengzhi Zhong, Yang Feng, Bin Zhou, Peiyan Liu, Yi Zhao, Shengtao Li","doi":"10.1002/macp.202400260","DOIUrl":"https://doi.org/10.1002/macp.202400260","url":null,"abstract":"Achieving excellent thermal and dielectric performance is crucial to prevent premature insulation failure of epoxy in high-frequency transformers. However, interfaces introduced by embedding micro/nano fillers in epoxy have opposite effects on these properties. Here, the interfacial characteristics of micro-BN/nano-Al2O3 epoxy is tailored composites by modifying nano-Al2O3 with functional amine groups, leading to simultaneous improvements in thermal conductivity and high-frequency breakdown strength. After modification, thermal conductivity increased from 0.193 to 0.490 W m−1 K−1 at 25 °C, and breakdown strength improved from 85.4 to 94.8 kV mm−1 at 10 kHz. The findings revealed the coexistence of overlapping interfaces between micro-BN and chemical interfaces between modified Al2O3-NH2 and matrix in composites. Contrary to the overlapping interface, the chemical interface played a more pivotal role in macroscopic performance. Calculations based on a covalent bonding interfacial model demonstrated that this in-situ tight interface facilitated phonon transport, thereby enhancing thermal conductivity. Besides the physical structure, an increase in electrostatic potential in the chemical interface also impeded charge migration, resulting in an improved breakdown strength. The synergistic effect of the chemical interface on thermal and dielectric properties presents a promising design strategy for developing high-performance epoxy composites.","PeriodicalId":18054,"journal":{"name":"Macromolecular Chemistry and Physics","volume":"226 4","pages":""},"PeriodicalIF":2.5,"publicationDate":"2024-11-03","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143455654","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"RegionCategory":"化学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 0

Recording Reflection Volume Holographic Gratings with Enhanced Performance by Two-Stage Photopolymers Containing Bifunctional Monomers

IF 2.5 4区化学

Macromolecular Chemistry and Physics Pub Date : 2024-10-29 DOI: 10.1002/macp.202400285

Bin Guo, Mingxuan Wang, Diqin Zhang, Minyuan Sun, Haoqiang Gao, Yong Bi, Yuxia Zhao

引用次数: 0

Bridging Frontiers in Macromolecular and Supramolecular Sciences with Living Cationic Ring-Opening Polymerization of Self-Organizable Dendronized Cyclic-Imino Ethers Generating Soft Frank–Kasper and Quasicrystal Arrays

IF 2.5 4区化学

Macromolecular Chemistry and Physics Pub Date : 2024-10-25 DOI: 10.1002/macp.202400339

Virgil Percec, Dipankar Sahoo

引用次数: 0

Highly Anti-Corrosive Performance of Poly(Vinylidene Fluoride-Hexafluoropropylene)/Boron Nitride Nanosheet/Polyimide Composite Coating 聚偏氟乙烯-六氟丙烯/氮化硼纳米片/聚酰亚胺复合涂层的高耐腐蚀性能

IF 2.5 4区化学

Macromolecular Chemistry and Physics Pub Date : 2024-10-24 DOI: 10.1002/macp.202400233

Lu Meng, Zexia Li, Weilong Wu, Bo Li, Zifeng Niu, Peng Wang, Jun Zhang, Chengchun Tang, Yanming Xue

{"title":"Highly Anti-Corrosive Performance of Poly(Vinylidene Fluoride-Hexafluoropropylene)/Boron Nitride Nanosheet/Polyimide Composite Coating","authors":"Lu Meng, Zexia Li, Weilong Wu, Bo Li, Zifeng Niu, Peng Wang, Jun Zhang, Chengchun Tang, Yanming Xue","doi":"10.1002/macp.202400233","DOIUrl":"https://doi.org/10.1002/macp.202400233","url":null,"abstract":"Polyimide (PI) is one of the most important engineering plastics, but its stability in aqueous environments is insufficient, which limits its anti-corrosion efficiency. In this study, a novel P(VDF-HFP)/SMT-RS@BNNSs/PI composite coating is prepared by incorporating poly(vinylidene fluoride-hexafluoropropylene) (P(VDF-HFP)) and the exfoliated boron nitride nanosheets (BNNSs) which were highly co-functionalized with two kinds of materials of the rosin and the soy-maleic anhydride-tannic acid adhesive molecules (SMT-RS@BNNSs). The coatings are characterized in detail by using the XRD, FT-IR, XPS, and SEM technologies. Electrochemical impedance spectroscopy (EIS) and polarization curve tests further evaluated the corrosion resistance of the coating. As results, the obtained P(VDF-HFP)/SMT-RS@BNNSs/PI coating with good adhesion (grade 1) to the low-carbon steel plate displays a larger water contact angle of 93.10° compared to blank PI (75.5°) and SMT-RS@BNNSs/PI (83.2°). The dispersed distribution and interaction of SMT-RS@BNNSs can effectively reduce the phase separation between P(VDF-HFP) and PI. Even after soaking in electrolyte for 15 days, the impedance modulus, corrosion current, and corrosion voltage of the P(VDF-HFP)/SMT-RS@BNNSs/PI coating are 1.568 × 1010 Ω cm2, 4.612 × 10−12 A cm−2, and 0.325 V, respectively. These properties are superior to those of the PI and SMT-RS@BNNSs/PI coatings. It is believed that the excellent anti-corrosive performance of this PI-based composite will broaden the application fields of PI materials.","PeriodicalId":18054,"journal":{"name":"Macromolecular Chemistry and Physics","volume":"225 23","pages":""},"PeriodicalIF":2.5,"publicationDate":"2024-10-24","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142869058","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"RegionCategory":"化学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 0

Dynamically Crosslinked Hydrogels Composed of Carboxymethyl Chitosan and Tannic Acid for Sustained Release of Encapsulated Protein

IF 2.5 4区化学

Macromolecular Chemistry and Physics Pub Date : 2024-10-22 DOI: 10.1002/macp.202400220

Tasuku Yamada, Yosuke Mizuno, Li Tian, Tetsuya Kitaguchi, Toshinori Fujie

{"title":"Dynamically Crosslinked Hydrogels Composed of Carboxymethyl Chitosan and Tannic Acid for Sustained Release of Encapsulated Protein","authors":"Tasuku Yamada, Yosuke Mizuno, Li Tian, Tetsuya Kitaguchi, Toshinori Fujie","doi":"10.1002/macp.202400220","DOIUrl":"https://doi.org/10.1002/macp.202400220","url":null,"abstract":"Polysaccharide-based hydrogels are promising for biomedical applications such as drug delivery owing to their biocompatibility, biodegradability, and bioactivities. In particular, there is a need for hydrogels with injectability for minimally invasive therapies and controlled sustained release for sustained drug effect. Hydrogels made from carboxymethyl chitosan (CMC) and tannic acid (TA) (CMC-TA) contain dynamic covalent bonds owing to autoxidation between CMC and TA, and interact with proteins via TA, elucidation of the detailed mechanism of dynamic covalent bonding in CMC-TA hydrogels will facilitate stable loading and zero-order release of proteins. Herein, the physical properties of oxidized CMC-TA (Oxi-CMC-TA) prepared for the encapsulation and sustained release of proteins are explored. Following incubation at 37 °C for 24 h, CMC-TA undergoes secondary crosslinking by autoxidation to produce Oxi-CMC-TA. Notably, CMC-TA is viscoelastic and shear-thinning, allowing for injection and 3D bioprinting. Indeed, CMC-TA can be 3D-printed with green fluorescent protein (GFP) encapsulated in its matrix. Oxi-CMC-TA also exhibits an affinity for protein owing to its gallol groups, enabling Oxi-CMC-TA to collect GFP in aqueous solutions against a concentration gradient. Moreover, Oxi-CMC-TA releases GFP over 15 days. Injectable, 3D-printable, protein-collecting, and zero-order sustained-releasing Oxi-CMC-TA has the potential to make a significant contribution to drug delivery.","PeriodicalId":18054,"journal":{"name":"Macromolecular Chemistry and Physics","volume":"226 4","pages":""},"PeriodicalIF":2.5,"publicationDate":"2024-10-22","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://onlinelibrary.wiley.com/doi/epdf/10.1002/macp.202400220","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143455997","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"RegionCategory":"化学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"OA","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 0

Masthead: Macromol. Chem. Phys. 20/2024 刊头：Macromol.Chem.20/2024

IF 2.5 4区化学

Macromolecular Chemistry and Physics Pub Date : 2024-10-21 DOI: 10.1002/macp.202470041

引用次数: 0

Efficient Stabilization and Directional-Controlled Release of Vitamin C in Disaccharide/Megasaccharide Composite Xerogels 二糖/多糖复合气凝胶中维生素 C 的高效稳定和定向控制释放

IF 2.5 4区化学

Macromolecular Chemistry and Physics Pub Date : 2024-10-21 DOI: 10.1002/macp.202470040

Patinya Karoh, Maiko K. Okajima, Tatsuo Kaneko, Thapakorn Tree-Udom

引用次数: 0

Riboflavin-Catalyzed Photoinduced Atom Transfer Radical Polymerization

IF 2.5 4区化学

Macromolecular Chemistry and Physics Pub Date : 2024-10-20 DOI: 10.1002/macp.202400323

Halil Ibrahim Coskun, Thomas Votruba-Drzal, Hanshu Wu, Steffen Jockusch, Gorkem Yilmaz, Krzysztof Matyjaszewski

引用次数: 0

Synthesis and Physicochemical Properties of Poly(2-Alkyl-2-Oxazoline)-Conjugated Hemoglobins as an Artificial O2 Carrier: Comparison with Polyethylene Glycol Conjugates

IF 2.5 4区化学

Macromolecular Chemistry and Physics Pub Date : 2024-10-20 DOI: 10.1002/macp.202400183

Ryuhei Wakabayashi, Kota Ishii, Taiga Yamada, Teruyuki Komatsu

{"title":"Synthesis and Physicochemical Properties of Poly(2-Alkyl-2-Oxazoline)-Conjugated Hemoglobins as an Artificial O2 Carrier: Comparison with Polyethylene Glycol Conjugates","authors":"Ryuhei Wakabayashi, Kota Ishii, Taiga Yamada, Teruyuki Komatsu","doi":"10.1002/macp.202400183","DOIUrl":"https://doi.org/10.1002/macp.202400183","url":null,"abstract":"Polyethylene glycol (PEG) is a biocompatible polymer extensively employed to prolong blood circulation and mitigate the immunogenicity of the protein therapeutics. Nonetheless, there are reports of anti-PEG antibody production. Poly(2-alkyl-2-oxazoline) (PROx) exhibits analogous immunological stealth properties and represents a potential substitute for PEG. This study details the synthesis of PROx-conjugated hemoglobins (PROxm-Hbs, R = Me, Et) as artificial O2 carriers, functioning as red blood cell (RBC) substitutes, and evaluates their O2 affinities and solution properties. The average number of polymers bound is designed to be 6 or 11. The O2 affinities (P50) of PMeOxm-Hbs and PEtOxm-Hbs are ascertained as 9 Torr, comparable to those of PEG-conjugated Hbs (PEGm-Hbs). The PEtOx6-HbT, synthesized under an N2 atmosphere, exhibited a low O2 affinity (P50 = 57 Torr). Through the admixture of PEtOx6-Hb and PEtOx6-HbT, the P50 value of the formulation to range from 9 to 57 Tor can be tailored as desired. The colloid osmotic pressures and viscosities of PMeOxm-Hb and PEtOxm-Hb solutions are lower than those of the corresponding PEGm-Hb solutions. Furthermore, the PROx conjugates evinced no cytotoxicity against normal cells. PMeOxm-Hbs and PEtOxm-Hbs, characterized by their appropriate O2 affinities and solution properties, present themselves as promising alternative materials to RBCs.","PeriodicalId":18054,"journal":{"name":"Macromolecular Chemistry and Physics","volume":"226 4","pages":""},"PeriodicalIF":2.5,"publicationDate":"2024-10-20","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143455817","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"RegionCategory":"化学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 0

Epoxidation of 1,2-Polybutadiene and Its Dielectric, Thermal, and Mechanical Properties

IF 2.5 4区化学

Macromolecular Chemistry and Physics Pub Date : 2024-10-18 DOI: 10.1002/macp.202400286

Yasuyuki Mori, Sho Morinaga, Ryu Tada, Tomoyuki Iwashima, Naomi Sato, Tomoyuki Ariyoshi, Toyofumi Shinozuka, Takehiro Kawauchi, Yoshio Furusho, Takeshi Endo

引用次数: 0