Thermosets are indispensable to our daily life,but their crosslinked structures make them unable to be processed by the melt processing like thermoplastics,which greatly limits their shape designs and applications.Her...Thermosets are indispensable to our daily life,but their crosslinked structures make them unable to be processed by the melt processing like thermoplastics,which greatly limits their shape designs and applications.Herein,we address this challenge via an in situ self-growing strategy,i.e.utilizing the dynamic imidazole-urea moiety to suck up and integrate epoxy into the materials and making the thermoplastics grow in situ into thermosets.With this strategy,thermosets can be readily processed via hot-melt extrusion molding,including melt spinning and fused deposition modeling 3D printing.More importantly,this strategy simultaneously integrates the flexibility of polyurethane and the robustness of epoxy resin into the resulting thermosets,yielding a mechanical-reinforcing effect to make the material not only strong but also tough(toughness:99.3 MJ·m^(-3),tensile strength:38.8 MPa).Moreover,the crosslinking density and modulus of the as-prepared thermosets(from 34.1 MPa to613.7 MPa)can be readily tuned on demand by changing the growth index.Furthermore,these thermosets exhibited excellent thermal stability and chemical resistance.展开更多
This paper presents a novel curve modeling method based on controlling rules of the shaping technique. The method describes the curve based on steplength and turning angle, and the characteristics of the curve near a ...This paper presents a novel curve modeling method based on controlling rules of the shaping technique. The method describes the curve based on steplength and turning angle, and the characteristics of the curve near a point. Then it introduces the process to extract ＂growing-rules＂for 2D and 3D curves described by familiar analytical expressions and curvature-torsion expressions. Examples of self-growing modeling for familiar analytical curves are presented. New curves are obtained by designing the grow-rules; corresponding examples are also presented.展开更多
Traditional adsorbents are normally suffered from a low adsorption capacity that has a finite saturated adsorption capacity. We reported herein a hierarchical self-growing porous calcium silicate hydrate(CSH) that use...Traditional adsorbents are normally suffered from a low adsorption capacity that has a finite saturated adsorption capacity. We reported herein a hierarchical self-growing porous calcium silicate hydrate(CSH) that uses biowaste as the precursor and is highly efficient in wastewater purification. In the process of phosphorus removal, CSH can react with phosphorus in water and grow into the hydroxyapatite(HAP). The generation of HAP further increases the active sites while maintains the porous structure of pristine CSH. Subsequently, the HAP could conduct the efficient extraction of Pb^(2+) from wastewater based on the ion exchange between Ca^(2+) and Pb^(2+). Clearly, the CSH structure has self-growing structure using the pollutants as the building blocks, not only achieving high adsorption capacity for pollutants, but also maintaining the hierarchically porous structure that supports the high efficiency in the next cycling. We provide here an intriguing pathway to tackle bottleneck of the traditional adsorbents, i.e., a finite saturated adsorption capacity.展开更多
Organisms are capable of self-growth through the integration of the nutrients provided by the external environment.This process slows down when they grow.In this study,we mimicked this self-regulated growth via a simp...Organisms are capable of self-growth through the integration of the nutrients provided by the external environment.This process slows down when they grow.In this study,we mimicked this self-regulated growth via a simple swelling-polymerization strategy in which the stretching polymer chains in the original networks provide entropic elasticity to restrict growth in high growth cycles.Using typical covalently crosslinked polymers,such as acrylamide-based hydrogels and HBA-based elastomers,as examples,we demonstrate that the crosslinked polymers can absorb polymerizable compounds through a swelling-polymerization process to expand their sizes,but the growth extent becomes smaller with increasing growth cycle until reaching a plateau.In addition to their size,these materials become stiffer and exhibit less swelling ability in solvents.Our work not only provides a new growing mode to tune the properties of crosslinked polymers but also discloses the underlying mechanism of crosslinked polymers in multi-cyclic swelling conditions.展开更多
基金financially supported by the Natural Science Foundation of Zhejiang Province(No.LQ24B040004)。
文摘Thermosets are indispensable to our daily life,but their crosslinked structures make them unable to be processed by the melt processing like thermoplastics,which greatly limits their shape designs and applications.Herein,we address this challenge via an in situ self-growing strategy,i.e.utilizing the dynamic imidazole-urea moiety to suck up and integrate epoxy into the materials and making the thermoplastics grow in situ into thermosets.With this strategy,thermosets can be readily processed via hot-melt extrusion molding,including melt spinning and fused deposition modeling 3D printing.More importantly,this strategy simultaneously integrates the flexibility of polyurethane and the robustness of epoxy resin into the resulting thermosets,yielding a mechanical-reinforcing effect to make the material not only strong but also tough(toughness:99.3 MJ·m^(-3),tensile strength:38.8 MPa).Moreover,the crosslinking density and modulus of the as-prepared thermosets(from 34.1 MPa to613.7 MPa)can be readily tuned on demand by changing the growth index.Furthermore,these thermosets exhibited excellent thermal stability and chemical resistance.
基金This paper is supported by the Natural Science Foundation of China(NSFC)under Grant No.50205010 and 50075029
文摘This paper presents a novel curve modeling method based on controlling rules of the shaping technique. The method describes the curve based on steplength and turning angle, and the characteristics of the curve near a point. Then it introduces the process to extract ＂growing-rules＂for 2D and 3D curves described by familiar analytical expressions and curvature-torsion expressions. Examples of self-growing modeling for familiar analytical curves are presented. New curves are obtained by designing the grow-rules; corresponding examples are also presented.
基金financially supported by the National Natural Science Foundation of China(No.51772053)the Program for New Century Excellent Talents in Fujian Province University。
文摘Traditional adsorbents are normally suffered from a low adsorption capacity that has a finite saturated adsorption capacity. We reported herein a hierarchical self-growing porous calcium silicate hydrate(CSH) that uses biowaste as the precursor and is highly efficient in wastewater purification. In the process of phosphorus removal, CSH can react with phosphorus in water and grow into the hydroxyapatite(HAP). The generation of HAP further increases the active sites while maintains the porous structure of pristine CSH. Subsequently, the HAP could conduct the efficient extraction of Pb^(2+) from wastewater based on the ion exchange between Ca^(2+) and Pb^(2+). Clearly, the CSH structure has self-growing structure using the pollutants as the building blocks, not only achieving high adsorption capacity for pollutants, but also maintaining the hierarchically porous structure that supports the high efficiency in the next cycling. We provide here an intriguing pathway to tackle bottleneck of the traditional adsorbents, i.e., a finite saturated adsorption capacity.
基金financially supported by the National Natural Science Foundation of China(Nos.52203135 and 52273206)Postdoctoral Fellowship Program of CPSF(No.GZC20230372)+4 种基金Huzhou Science and Technology Program Projects(No.2023GZ18)Zhejiang Postdoctoral Research Project(No.ZJ2023133)Science and Technology Cooperation Fund Program of Chengdu-Chinese Academy of ScienceHunan Provincial Natural Science Foundation(No.2021JJ10029)Huxiang High-level Talent Gathering Project(No.2022RC4039)。
文摘Organisms are capable of self-growth through the integration of the nutrients provided by the external environment.This process slows down when they grow.In this study,we mimicked this self-regulated growth via a simple swelling-polymerization strategy in which the stretching polymer chains in the original networks provide entropic elasticity to restrict growth in high growth cycles.Using typical covalently crosslinked polymers,such as acrylamide-based hydrogels and HBA-based elastomers,as examples,we demonstrate that the crosslinked polymers can absorb polymerizable compounds through a swelling-polymerization process to expand their sizes,but the growth extent becomes smaller with increasing growth cycle until reaching a plateau.In addition to their size,these materials become stiffer and exhibit less swelling ability in solvents.Our work not only provides a new growing mode to tune the properties of crosslinked polymers but also discloses the underlying mechanism of crosslinked polymers in multi-cyclic swelling conditions.
