Polymer Science, Series A最新文献

{"title":"Construction of PDA@PAM-CMCNa-CaCl2 Vertical Porous Hydrogels for Solar-Powered Spontaneous Atmospheric Water Harvesting","authors":"Tiantian Ren,&nbsp;Yuanyuan Xu,&nbsp;Jianning Wu,&nbsp;Guihua Meng,&nbsp;Shengchao Yang,&nbsp;Lin Cui,&nbsp;Zhiyong Liu,&nbsp;Xuhong Guo","doi":"10.1134/S0965545X23701079","DOIUrl":"10.1134/S0965545X23701079","url":null,"abstract":"<p>Collecting water from the air could alleviate freshwater shortages in arid regions such as remote and inland areas. However, it is challenging to prepare adsorption materials that have high adsorption and desorption performance using straightforward synthesis routes for water harvesting applications. In this paper, a polydopamine (PDA)@Sodium polyacrylamide carboxymethyl cellulose (PAM-CMCNa)-calcium chloride (CaCl₂) composite aerogel (PDCA) with a vertical channel was prepared by salt template method and photopolymerization for atmospheric water collection (AWH). The designed vertical channel promotes the rapid transport of water molecules from the atmosphere to the interior of the hydrogel through capillary action. During this process, the hydrogel further expands to prevent the leakage of the internal salt solution, which effectively improves the water vapor adsorption and desorption by hydrogel. Experimental results showed that the hydrogel can absorb 2.78 g/g of water at 90% relative humidity (RH), where 56.3% of the captured water can be desorbed within 60 min of exposure under 1.0 sun light intensity. After 10 adsorption-desorption cycles, the PDCA still possesses excellent water sorption performance. The indoor water collection test showed that the water collection performance reached 2.143 kg/kg day at 90% RH and 25°C adsorption for 12 h and desorption for 6 h. The proposed method for the preparation of PDCA composites can achieve high water harvesting performance over a wide humidity range to enable solar-driven clean water production in remote areas.</p>","PeriodicalId":738,"journal":{"name":"Polymer Science, Series A","volume":"65 4","pages":"358 - 368"},"PeriodicalIF":1.0,"publicationDate":"2023-08-31","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"79774637","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}

{"title":"Morphological Transitions in Solutions of Macromolecules with Solvophilic Backbone and Orientationally Mobile Solvophobic Side Groups","authors":"G. A. Shuldyakov,&nbsp;A. I. Buglakov,&nbsp;D. E. Larin","doi":"10.1134/S0965545X23701006","DOIUrl":"10.1134/S0965545X23701006","url":null,"abstract":"<p>A theoretical model describing the self-assembly in dilute solutions of amphiphilic macromolecules containing the backbone built of the solvophilic units (the P groups) and the solvophobic side chains (the H groups) possessing orientational mobility relative to the backbone units has been elaborated. In the framework of strong segregation limit (The size of the insoluble regions of the formed micelles is on the order of the hydrophobic side chains), state diagrams of the solution have been calculated with and without accounting for the orientational entropy contribution of the side groups to the total free energy of the solution at different thermodynamic qualities of solvent for the macromolecules and the grafting density of the H groups; the regions of stability of spherical and cylindrical micelles as well as planar bilayers (vesicles) have been revealed. It has been found that the contribution of the orientational entropy significantly affects the view of the state diagrams. In the case of considering the orientational mobility, the conditions of the cylindrical micelle stability are very sensitive to the change in the grafting density of the side groups. This sensitivity can be the reason why the formation of long cylindrical (wormlike) micelles is not observed in experiments and computer simulations. As earlier demonstrated at a qualitative level, the orientational mobility of the side groups can lead to the emergence of the orientation-induced attraction between the polymer micelles (A. I. Buglakov, D. E. Larin, and V. V. Vasilevskaya, Polymer <b>232</b>, 124160 (2021)). In this study, exact analytical calculations of the energy of orientation-induced attraction for the case of the interaction between two planar bilayer micelles has been performed. At distances being of the order of the size of the side H group, the orientation-induced attraction forces are much stronger than the van der Waals forces and, hence, the orientation-induced attraction can be decisive in the formation of large aggregates observed in experiments.</p>","PeriodicalId":738,"journal":{"name":"Polymer Science, Series A","volume":"65 4","pages":"406 - 419"},"PeriodicalIF":1.0,"publicationDate":"2023-08-31","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"84680267","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}

{"title":"Preparation and Characterization of Blended Sulfonated Poly(arylene ether phosphine oxide)/Trisulfonated Poly(phthalazinone ether phosphine oxide) Proton Exchange Membranes","authors":"Yajie Wang,&nbsp;Runan Zu,&nbsp;Liqin Kang,&nbsp;Huiying Liao,&nbsp;Huiping Liu","doi":"10.1134/S0965545X23701067","DOIUrl":"10.1134/S0965545X23701067","url":null,"abstract":"<p>A series of blend membranes based on sulfonated poly(arylene ether phosphine oxide) (sPEPOF) and trisulfonated poly(phthalazinone ether phosphine oxide) (tsPPEPO) were prepared and studied. These blend membranes showed good compatibility, which might be ascribed to the excellent adhesive ability of the phosphine oxide groups and the strong intermolecular interaction. The properties of the blend membranes such as water uptake, swelling, proton conductivity, oxidative stability and methanol permeability were characterized in detail. The results showed that 7.5% weight content of blending tsPPEPO was beneficial to improve the blend membrane’s dimensional stability, oxidative stability, methanol resistance, and simultaneously keep considerable proton conductivity. For example, the blend membrane tsPPEPO-7.5 has an in-plane swelling of 8.2% and a through-plane swelling of 4.9% at 80°C, which are lower than those (14.1 and 13.0%, respectively) of the original sPEPOF membrane. At the same time, it has a conductivity of 0.080 S/cm, and its methanol permeability is about one-thirtieth of that of Nafion 117. Furthermore, the oxidative stability is also remarkably improved compared with that of the original sPEPOF membrane. Therefore, tsPPEPO is an ideal blend component for the achieved blend membranes, which exhibited excellent overall properties and application prospect.</p>","PeriodicalId":738,"journal":{"name":"Polymer Science, Series A","volume":"65 4","pages":"369 - 376"},"PeriodicalIF":1.0,"publicationDate":"2023-08-31","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"78330648","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}

{"title":"Molecular Properties of Protonated Diallylammonium Polymers Synthesized via Reversible Addition−Fragmentation Chain-Transfer Polymerization","authors":"N. P. Yevlampieva,&nbsp;O. S. Vezo,&nbsp;M. A. Slyusarenko,&nbsp;A. S. Gubarev,&nbsp;Yu. A. Simonova,&nbsp;I. V. Eremenko,&nbsp;M. A. Topchiy,&nbsp;L. M. Timofeeva","doi":"10.1134/S0965545X2370102X","DOIUrl":"10.1134/S0965545X2370102X","url":null,"abstract":"<p>Protonated diallylammonium polymers are special among cationic polyelectrolytes, due to a series of properties including high antimicrobial activity, for example, towards <i>Mycobacterium tuberculosis</i>. The polymers samples should be characterized properly for their practical application. In this study, protonated secondary polydiallylamines based on diallylammonium trifluoroacetate have been synthesized via radical reversible addition−fragmentation chain-transfer polymerization in the presence of 2-[(ethoxycarbonothioyl)sulfanyl]acetic acid. The NMR spectroscopy data have shown that the macromolecules contain the dithiocarbonyl terminal groups enhancing the polymer solubility in nonaqueous media, for instance, in methanol. The obtained polymers have been investigated by means of hydrodynamics and dynamic light scattering methods; molecular mass and hydrodynamic parameters of the macromolecules have been determined. Comparison of the polymers with similar ones synthesized via conventional radical polymerization and bearing terminal vinyl groups has revealed the independence of their hydrodynamic properties in 1.0 mol/L NaCl on the synthesis method and the terminal groups structure at <i>М</i> &gt; 8 × 10³, thus allowing the application of the scaling relationships for the diallylammonium polymers to determine the molecular mass, irrespectively on the preparation methods.</p>","PeriodicalId":738,"journal":{"name":"Polymer Science, Series A","volume":"65 4","pages":"303 - 311"},"PeriodicalIF":1.0,"publicationDate":"2023-08-31","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"74786235","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}

{"title":"Erratum to: Self-Assembly of Gel-Like Particles and Vesicles in Solutions of Polymers with Amphiphilic Repeat Unit","authors":"A. I. Buglakov,&nbsp;V. A. Ivanov,&nbsp;V. V. Vasilevskaya","doi":"10.1134/S0965545X23900017","DOIUrl":"10.1134/S0965545X23900017","url":null,"abstract":"","PeriodicalId":738,"journal":{"name":"Polymer Science, Series A","volume":"65 3","pages":"302 - 302"},"PeriodicalIF":1.0,"publicationDate":"2023-08-14","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"4562304","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}

{"title":"Effect of Thermoplastic Polyurethane on the Mechanical Properties and Structure of Poly(butylene terephthalate)/Thermoplastic Polyurethane Blend","authors":"Thi Hong Nga Pham,&nbsp;Van-Thuc Nguyen,&nbsp;Tran Minh The Uyen,&nbsp; Vinh-Tien Nguyen,&nbsp;Hoang-Khang Lu","doi":"10.1134/S0965545X23700980","DOIUrl":"10.1134/S0965545X23700980","url":null,"abstract":"<p>Poly(butylene terephthalate) is a rigid polymer with poor elasticity and impact resistance. In this research, thermoplastic polyurethane is mixed with poly(butylene terephthalate) through injection molding to improve the impact strength and elasticity of the blend. The findings revealed that the blend had higher impact toughness but lower tensile and flexural strengths when compared to neat poly(butylene terephthalate).</p>","PeriodicalId":738,"journal":{"name":"Polymer Science, Series A","volume":"65 4","pages":"377 - 385"},"PeriodicalIF":1.0,"publicationDate":"2023-08-09","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"87200986","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}

{"title":"Modifying Effect of Polyethylene Fractions of Different Molecular Weights on the Morphology and Properties of Reactor Polymer Compositions Based on Ultrahigh Molecular Weight Polyethylene","authors":"S. S. Gostev,&nbsp;E. E. Starchak,&nbsp;T. M. Ushakova,&nbsp;V. G. Grinev,&nbsp;V. G. Krasheninnikov,&nbsp;A. Ya. Gorenberg,&nbsp;D. N. Vtyurina,&nbsp;T. A. Ladygina,&nbsp;L. A. Novokshonova","doi":"10.1134/S0965545X23700992","DOIUrl":"10.1134/S0965545X23700992","url":null,"abstract":"<p>Reactor polymer compositions (RPCs) based on UHMWPE with <i>M</i>_w = 1000 kg mol^–1 and low molecular weight HDPE (LMWPE) were studied. Two series of UHMWPE compositions were used to determine the influence of the molecular weight and properties of the LMWPE fraction on the morpho-logy, mechanical and rheological properties of UHMWPE/LMWPE. Сompositions, including from 10 to 80 wt % UHMWPE with <i>M</i>_w = 160 kg mol^–1 (PE-160) were obtained in a two-stage process of ethylene polymerization with a metallocene catalyst. They differed in the order of introduction of PE-160 into UHMWPE (PE-160/UHMWPE and UHMWPE/PE-160). Compositions of UHMWPE and LMWPE with <i>M</i>_w = 48 kg mol^–1 (PE-48/UHMWPE) with PE-48 content from 6 to 30 wt % were synthesized in a single-stage polymerization of ethylene in the presence of a tandem catalyst. A comparison of the shape and size of particles of nascent polymer products was made using the SEM method. The morphology, tensile, dynamic mechanical and rheological properties of RPC have been studied depending on the method of their preparation, the content of the low molecular weight fraction, its molecular weight and physical and mechanical properties. An increase in the proportion of PE-160 and PE-48 in PE-160/UHMWPE and PE‑48/UHMWPE leads to an increase in RPC crystallinity, tensile modulus and dynamic mechanical modulus with significant deviations from the additivity rule.</p>","PeriodicalId":738,"journal":{"name":"Polymer Science, Series A","volume":"65 4","pages":"386 - 395"},"PeriodicalIF":1.0,"publicationDate":"2023-08-09","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"76562117","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}

{"title":"Mechanical Properties of Anisotropic Magnetic Elastomers","authors":"G. V. Stepanov,&nbsp;S. I. Kirichenko,&nbsp;E. E. Makhaeva,&nbsp;E. Yu. Kramarenko","doi":"10.1134/S0965545X23700797","DOIUrl":"10.1134/S0965545X23700797","url":null,"abstract":"<p>Anisotropic magnetically active elastomers based on polydimethylsiloxane and magnetic particles of different chemical natures, shapes, and sizes have been synthesized. A comparative analysis of their mechanical properties (elastic modulus, strength, and elongation at break) has been performed depending on the mutual orientation of the internal structure, formed by magnetic filler particles during the synthesis of the composite in a magnetic field, and the direction of the external mechanical force applied to stretch the samples. The anisotropy of mechanical properties is most pronounced in composites based on anisometric particles, needle-like and plate-like. The highest values of anisotropy coefficient of elastic modulus are observed in the composite containing plate-like iron microparticles; for this composite, the ratio of the elastic moduli in the directions parallel and perpendicular to the internal structure reaches a value of five. The use of magnetic filler and its orientation by means of magnetic field is an effective method for creating polymer composites with anisotropy of mechanical properties.</p>","PeriodicalId":738,"journal":{"name":"Polymer Science, Series A","volume":"65 2","pages":"157 - 168"},"PeriodicalIF":1.0,"publicationDate":"2023-07-17","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"4683071","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}

{"title":"Preparation of Nonwoven Carbon Materials from Fabrics Based on Flax Cellulose and Viscose Fibers","authors":"I. S. Makarov,&nbsp;A. G. Smyslov,&nbsp;D. N. Chernenko,&nbsp;M. I. Vinogradov,&nbsp;S. A. Legkov,&nbsp;I. S. Levin,&nbsp;H. A. Arkharova,&nbsp;V. G. Kulichikhin","doi":"10.1134/S0965545X23700979","DOIUrl":"10.1134/S0965545X23700979","url":null,"abstract":"<p>A method for obtaining nonwoven carbon materials by the staged heat treatment of cellulose felt is developed. Fabrics produced from fibrous flax cellulose and viscose fibers by needle punching are used as nonwoven precursors. To obtain carbon fabric precursors the optimum ratios of components are chosen from the data on the formation of nonwoven fabrics and the thermal analysis of various blend formulations. It is shown that the content of flax fibers in the system should be at least 50%. Viscose fibers play the role of a reinforcing material and so far cannot be fully excluded from the system. With an increase in the content of flax cellulose the value of carbon yield grows. The mechanical properties of the carbon felt are provided by the physical network of friction and dispersion contacts between individual fibers. Upon heat treatment of the composite nonwoven material, the morphological features of precursor fibers remain unchanged. The interplanar distances of carbon layers in the carbon material are calculated using X-ray diffraction analysis and transmission electron microscopy. The fraction of carbon upon heat treatment to 1700°С is at least 90%, and after graphitization to 2400°С the purity of the product is above 99%. The maximum values of carbon yield at this temperature may be as high as 25‒27%. The coefficients of thermal conductivity of the carbon felt are measured, and the values obtained are 30% lower than the corresponding parameters of carbon fabrics.</p>","PeriodicalId":738,"journal":{"name":"Polymer Science, Series A","volume":"65 3","pages":"246 - 255"},"PeriodicalIF":1.0,"publicationDate":"2023-07-10","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"4729393","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}

{"title":"The Influence of Ultralow Content of Graphene on Wear-Resistant Properties of Composites Based on Ultra-High Molecular Weight Polyethylene","authors":"A. S. Zabolotnov,&nbsp;S. S. Gostev,&nbsp;M. V. Gudkov,&nbsp;L. A. Novokshonova,&nbsp;R. I. Chelmodeev","doi":"10.1134/S0965545X23700967","DOIUrl":"10.1134/S0965545X23700967","url":null,"abstract":"<p>The composite samples with the graphene filler content of 0.014 to 0.05 wt % have been prepared via the in situ polymerization. The effect of the ultralow content of graphene on the set of wear-resistant and tribological properties of the synthesized composited based on ultra-high molecular weight polyethylene has been studied. Weas resistance of the synthesized materials under conditions of high-speed impact of a water-sand suspension, wear during microcutting and friction wear resistance have been investigated. Furthermore, the friction coefficient on steel has been determined. The introduction of graphene into the ultra-high molecular weight polyethylene has improved the resistance to abrasion during microcutting and has increased the wear resistance under the action of the water-sand suspension (the free abrasive wear).</p>","PeriodicalId":738,"journal":{"name":"Polymer Science, Series A","volume":"65 3","pages":"296 - 301"},"PeriodicalIF":1.0,"publicationDate":"2023-07-10","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"4423974","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}