ACS Applied Polymer Materials, Год журнала: 2025, Номер unknown
Опубликована: Апрель 15, 2025
Язык: Английский
Progress in Polymer Science, Год журнала: 2023, Номер 143, С. 101713 - 101713
Опубликована: Июнь 25, 2023
Язык: Английский
Процитировано
80
Chemistry of Materials, Год журнала: 2022, Номер 34(23), С. 10249 - 10271
Опубликована: Ноя. 21, 2022
Less than 10% of plastics are recycled worldwide, among which polyolefins, form two-thirds all produced polymers, the most discarded ones. This stems from nonpolar nature limits their degradation and recycling. As such, any approach that may promote recycling polyolefins can significantly shift statistics polymer toward a more sustainable future. To account for that, vitrimer concept proposes unique solution not only increases polarity as such promotes degradation, but also expands utility polyolefin elastomers compensates significant loss mechanical properties upon sequential in thermoplastic polyolefins. Vitrimers networks formed by reversible covalent cross-links undergo percolation-conserving exchange reactions at high temperatures. Therefore, while they solid network service conditions, be reprocessed above temperature threshold. Thanks to this, have applications interface thermoplastics thermosets ranging recyclable, self-healing, adhesive materials creep-resistant shape-memory networks. Review aims classify cross-linking chemistries employed production polyolefin-derived vitrimers highlight subsequent changes material further development novel vitrimers.
Язык: Английский
Процитировано
71
Angewandte Chemie International Edition, Год журнала: 2024, Номер 63(10)
Опубликована: Янв. 18, 2024
Abstract Supramolecular polymer networks (SPNs), crosslinked by noncovalent bonds, have emerged as reorganizable and recyclable polymeric materials with unique functionality. However, poor stability is an imperative challenge faced SPNs, because SPNs are susceptible to heat, water, and/or solvents due the dynamic reversible nature of bonds. Herein, design a cooperative network (NCoN) simultaneously stabilize reinforce reported, resulting in ultrastable, superrobust, SPN. The NCoN constructed multiplying H‐bonding sites tuning conformation/geometry segment optimize multivalence cooperativity H‐bonds. rationally designed high conformational compliance favors formation tightly packed H‐bond arrays comprising higher‐density stronger Consequently, H‐bonded crosslinks display covalent crosslinking effect but retain on‐demand dynamics reversibility. resultant ultrastable SPN not only displays remarkable resistance heat up 120 °C, water soaking, broad spectrum solvents, also possesses superhigh true stress at break (1.1 GPa) ultrahigh toughness (406 MJ m −3 ). Despite covalent‐network‐like stability, through activating its reversibility high‐polarity solvent heated threshold temperature.
Язык: Английский
Процитировано
31
Advanced Functional Materials, Год журнала: 2024, Номер unknown
Опубликована: Апрель 8, 2024
Abstract The exploitation of bio‐based materials derived from renewable resources represents a pivotal strategic approach in addressing environmental pollution and alleviating the scarcity fossil resources. 2,5‐Furandicarboxylic acid (FDCA) is most potential substitute for terephthalic acid. Lignin abundant aromatic biomass resource. However, preparation high‐performance lignin/FDCA‐based bio‐polyesters remains formidable challenge. Herein, multifunctional lignin‐modified polyester elastomer (LFPEe) designed using FDCA‐based oligomer (PPeF) lignin (AOH) as building blocks. LFPEe exhibits superior mechanical properties with optimum tensile strength, fracture strain, elastic recovery ratio up to 58.9 MPa, 610% 88.9%, respectively, attributing formation dual cross‐linking network nanophase separation structure. Furthermore, leveraging inherent characteristics lignin, demonstrates excellent light‐controlled shape memory UV shielding performance. This innovative work not only breaks performance dependence on high molecular weight but also highlights novel paradigm value‐added utilization sustainable bio‐polyesters.
Язык: Английский
Процитировано
24
The Canadian Journal of Chemical Engineering, Год журнала: 2023, Номер 101(9), С. 4886 - 4906
Опубликована: Янв. 4, 2023
Abstract Polyolefin thermoplastic elastomers (TPE‐Os) are high‐performance polyolefins consisting of both plastic and rubber phases. Compared with other elastomers, the TPE‐Os possess better chemical stability, transparency, re‐processability, electrical insulation, which renders their broad applications possible. By manipulating chain structures topologies TPE‐Os, differently structured improved thermal mechanical properties have been developed, including ethylene α‐olefin random copolymers (POEs), olefin block (OBCs), comb‐shaped polyolefin (CPOEs), dynamically cross‐linked elastomers. Herein, we review synthesis POE, OBC, CPOE, dynamical elastomer, catalyst systems, polymerization techniques, processes, kinetic modelling. The characterization relationships between TPE‐O structure, aggregated state, product performance discussed. future development higher‐performance is envisaged.
Язык: Английский
Процитировано
39
Macromolecules, Год журнала: 2023, Номер 56(23), С. 9766 - 9777
Опубликована: Ноя. 29, 2023
With environmental concerns increasing, the development of durable, degradable, and reprocessable elastomers is crucial for advancement environmentally friendly wearable electronics. Herein, self-healing, polyimine with a cross-linked network constructed by dynamic imine bonds were synthesized under room temperature flexible strain sensor. Owing to formation microphase separation structure polyetheramine as soft segments adipic acid dihydrazide hard segments, obtained elastomer exhibited superior mechanical properties elongation at break 1158% tensile strength 2.51 MPa. Moreover, endowed outstanding self-healing capability reprocessability. The healing efficiency reached 96.0% after 24 h, reprocessed maintained 80.6% original three reprocessing cycles. In addition, was able completely degrade into monomers acidic condition within 180 min. elastomer-based sensor liquid metal conductive material processed excellent recovery ability sensing performance even being cut two halves. findings in this work conceivably stand out new methodology preparation functional
Язык: Английский
Процитировано
33
Macromolecules, Год журнала: 2024, Номер 57(6), С. 2756 - 2772
Опубликована: Март 6, 2024
Reactive processing provides a simple approach for grafting dynamic covalent cross-linkers onto linear or branched polymers, resulting in adaptable networks (CANs). We synthesized poly(n-hexyl methacrylate) (PHMA) CANs from neat, entangled PHMA using radical-based reactive to graft the cross-linker called BiTEMPS methacrylate (BTMA) between side chains. By tuning BTMA loading, we achieved range of cross-link densities and characterized how stress relaxation, elevated-temperature creep, reprocessability are affected by density. The cross-links chains allowed novel comparison our reversible, polymers described sticky reptation theory, which long-time relaxation occurs unraveling backbone entanglements, process enabled dissociation subsequent exchange side-chain "stickers." observed two regimes that required their fitting combination stretched exponential decay functions extract pertinent parameters. apparent activation energies creep viscosity same within experimental uncertainty these CANs, verifying shared mechanisms governing temperature dependence viscoelastic responses, independent CAN Notably, made linking ∼50–60% those reported previously with chain backbones. These outcomes demonstrate importance synthesis-structure-property-reprocessing relationships may be various methods varying position incorporation structure.
Язык: Английский
Процитировано
14
Angewandte Chemie, Год журнала: 2024, Номер 136(10)
Опубликована: Янв. 18, 2024
Abstract Supramolecular polymer networks (SPNs), crosslinked by noncovalent bonds, have emerged as reorganizable and recyclable polymeric materials with unique functionality. However, poor stability is an imperative challenge faced SPNs, because SPNs are susceptible to heat, water, and/or solvents due the dynamic reversible nature of bonds. Herein, design a cooperative network (NCoN) simultaneously stabilize reinforce reported, resulting in ultrastable, superrobust, SPN. The NCoN constructed multiplying H‐bonding sites tuning conformation/geometry segment optimize multivalence cooperativity H‐bonds. rationally designed high conformational compliance favors formation tightly packed H‐bond arrays comprising higher‐density stronger Consequently, H‐bonded crosslinks display covalent crosslinking effect but retain on‐demand dynamics reversibility. resultant ultrastable SPN not only displays remarkable resistance heat up 120 °C, water soaking, broad spectrum solvents, also possesses superhigh true stress at break (1.1 GPa) ultrahigh toughness (406 MJ m −3 ). Despite covalent‐network‐like stability, through activating its reversibility high‐polarity solvent heated threshold temperature.
Язык: Английский
Процитировано
9
Industrial & Engineering Chemistry Research, Год журнала: 2025, Номер 64(9), С. 5080 - 5086
Опубликована: Фев. 24, 2025
The development of polymer materials with high performance and good reusability is critical to sustainability the industry. However, balance these two aspects in elastomers rubbers highly challenging. Here, we report synthesis a novel polyolefin elastomer (POE) dynamically cross-linked by an imine-linked boronic ester. It improves tensile strength at break (σ) POE 148.2%, Young's modulus (E) 92.6%, toughness (UT) 49.4%, slightly decreased elongation break. also has higher thermal resistance than pristine one presents steady storage plateau 2.8 MPa above 150 °C. Moreover, it can be reprocessed impressive recovery ratio UT 89.7% because dynamic exchanges ester imine. Dynamic mechanical analysis shows that cross-linking short characteristic relaxation time 9.6 min low apparent activation energy 65.1 kJ·mol–1. Our study on POEs provides new way for sustainable elastomers.
Язык: Английский
Процитировано
1
ACS Applied Materials & Interfaces, Год журнала: 2022, Номер 14(40), С. 45966 - 45977
Опубликована: Сен. 27, 2022
Because of its rather low melt strength, polylactide (PLA) has yet to fulfill promise as advanced biobased and biodegradable foams replace fossil-based polymer foams. In this work, PLA vitrimers were prepared by two-step reactive processing from commercial thermoplastics, glycerol, diphenylmethane diisocyanate (MDI) using Zn(II)-catalyzed addition transesterification chemistry. The reaction glycerol occurs with zinc acetate the catalyst, chain scission will take place due alcoholysis chains free hydroxyl groups glycerol. Long-chain can be obtained then cross-linked MDI. Rheological analysis shows that formed network significantly improve strength promote strain hardening under extensional flow. still maintain ability thermoplastic via extrusion compression. enhanced rearrangement topology facilitate foaming processing. An expansion ratio large 49.2-fold microcellular foam a uniform cell morphology for gel fraction 51.8% through supercritical carbon dioxide technique. This work provides new way scale-up possibility enhance PLA, broadened range applicability brought is truly valuable in terms realization sustainable society.
Язык: Английский
Процитировано
31