Extreme Mechanics Letters, Год журнала: 2024, Номер unknown, С. 102277 - 102277
Опубликована: Дек. 1, 2024
Язык: Английский
Journal of the Mechanics and Physics of Solids, Год журнала: 2024, Номер 193, С. 105844 - 105844
Опубликована: Сен. 2, 2024
The contact between a rigid Hertzian indenter and an adhesive broad-band viscoelastic substrate is considered. material behaviour described by modified power law model, which characterized only four parameters, the glassy rubbery elastic moduli, characteristic exponent n timescale τ0. maximum adherence force that can be reached while unloading from relaxed half-space studied means of numerical implementation based on boundary element method, as function velocity, preload varying broadness spectrum. Through comprehensive analysis we have determined minimum radius needed to achieve amplification pull-off at specified rate for different exponents n. results are then compared with prediction Persson Brener crack propagation theory, providing excellent agreement. However, comparison against experimental tests glass lens indenting PDMS shows data fitted linear theory up about 100μm/s showing fracture process zone rate-dependent contribution energy enhancement same order bulk dissipation contribution. Hence, limitations current theoretical models adhesion discussed in light most recent literature results.
Язык: Английский
Процитировано
6
The Journal of Chemical Physics, Год журнала: 2024, Номер 161(18)
Опубликована: Ноя. 11, 2024
I study the influence of temperature and crack-tip velocity bond breaking at crack tip in rubber-like materials. Bond is considered as a stress-aided thermally activated process results an effective propagation energy, which increases strongly with decreasing or increasing speed. This effect particularly important for adhesive (interfacial) but less cohesive (bulk) owing to much larger bond-breaking energies latter case. For cracks, theory are consistent adhesion measurements silicone rubber polydimethylsiloxane (PDMS) contact silica glass surfaces. agrees well experimental PDMS films chemically bound silanized glass.
Язык: Английский
Процитировано
4
Journal of the Mechanics and Physics of Solids, Год журнала: 2025, Номер unknown, С. 106047 - 106047
Опубликована: Янв. 1, 2025
Язык: Английский
Процитировано
0
ACS Nano, Год журнала: 2025, Номер 19(5), С. 5539 - 5548
Опубликована: Янв. 31, 2025
The excessive use of fluoride in fibrous membranes poses significant bioaccumulative threats to the environment and human health. However, most existing used protective clothing desalination systems show high fluorine dependence inevitable trade-offs between liquid repellency breathability. Herein, fluorine-free bonded scaffolded nanofiber/network are developed using electro-coating-netting technique achieve high-performance liquid-repellency By manipulating stretching electrospun jets polarization electrets, rough electrostatic wetting nanofibers obtained as scaffolds, on which long-chain alkyl precursors coated assemble 2D networks consisting nanowires with diameters ∼42 nm bonding points. resultant exhibit small pore sizes ∼460 nm, highly interconnected tortuous channels, a water contact angle ∼138°, elastic elongation up 300%, thereby providing both (125 kPa) vapor permeability (4206 g m-2 d-1), making them effective for desalination. This work could inspire innovative design ecofriendly nanofibrous materials filtration separation.
Язык: Английский
Процитировано
0
Polymer Engineering and Science, Год журнала: 2025, Номер unknown
Опубликована: Апрель 2, 2025
Abstract The paper presents an analysis of plastic particles flow and breakage in a solid‐state shear mill (S3M). This resembles the traditional stone used for flour milling. Particle their are modeled as being result work done on surface they compressed, sheared, cut between rotating disc stationary normally loaded disc. resulting equations give fractions milled, x w,d , size reduction S r terms applied load f number passes, n p through mill, rotational speed, N . model were fitted against wide range S3M data particles, with grinding additives, mixed waste particles. A single parameter function ( fn / ) Φ was found to control reduction, exponent distinguishing effects feed nature composition. Highlights Solid state milling provides intense 3D scissor reduction. In follow long spiral path. Simple particle based surfaces. combines passes speed dimensionless
Язык: Английский
Процитировано
0
Materials and Structures, Год журнала: 2025, Номер 58(4)
Опубликована: Апрель 15, 2025
Язык: Английский
Процитировано
0
ACS Applied Polymer Materials, Год журнала: 2025, Номер unknown
Опубликована: Апрель 15, 2025
Язык: Английский
Процитировано
0
Soft Matter, Год журнала: 2024, Номер unknown
Опубликована: Янв. 1, 2024
In this study, we investigate three different polymeric networks in terms of their tensile strength as a function stretching rate, or temperature, medium viscosity.
Язык: Английский
Процитировано
2
ACS Applied Polymer Materials, Год журнала: 2024, Номер 6(14), С. 8306 - 8317
Опубликована: Июль 13, 2024
The higher notch sensitivity of polycarbonate (PC) at low temperatures limits its application in some fields. In this work, a ternary copolymer P(St-SiO-An) composed styrene (St), silicon oil (SiO), and acrylonitrile (An) was synthesized via conventional radical copolymerization. Then, the compatibilities between PC/silicon rubber (Sr), PC/P(St-SiO-An), P(St-SiO-An)/Sr were predicted through molecular dynamics simulation. By using as effective compatibilizer, series PC/Sr blends prepared melt blending method. mechanical, morphological, thermal, rheological changes investigated detail. simulation showed that PC/P(St-SiO-An) pairs significantly than those pair. with distinct chemical composition successfully according to results Fourier transform infrared, 1H nuclear magnetic resonance, gel permeation chromatography, differential scanning calorimetry, thermogravimetric analysis methods. Under optimal = 95/5 4 phr P(St-SiO-An), transition from brittle superductile fracture observed on notched impact cross-section blend −40 °C, strength reached 116.2 kJ/m2, which more 7 times 16.5 kJ/m2 for pure PC 94.1% yield retention ratio room temperature. Cavitation-matrix-forced high elastic deformation main toughening mechanism temperatures. Furthermore, introduction Sr compatibilizer hardly affected thermal performance PC, stability processability enhanced. Compared SABIC EXL commercial work shows great advantages preparation methods comprehensive properties, are expected further broaden field low-temperature resistance.
Язык: Английский
Процитировано
1
Physical review. E, Год журнала: 2024, Номер 110(6)
Опубликована: Дек. 13, 2024
Highly stretchable elastomers show a well-known discontinuous fracture transition, involving crack propagation speed becoming double-valued within certain window of network stretching. This transition can occur either in continuous stretching or after sizable step stretch. Crack increases sharply with rising temperature, suggesting that dissociation backbone bonds strands is the origin fracture. Consequently, nature appears to be related how evolves redistribute strand tension, getting more participate fast growth on upper branch transition. Beyond bound window, sufficiently high leads only because load-bearing cannot survive due higher bond tension longer timescales. Conversely, below minimal degree stretching, also disappears, and proceeds slow growth, where very few are ready undergo chain scission necessary for
Язык: Английский
Процитировано
1