scholarly journals A Guide through the Dental Dimethacrylate Polymer Network Structural Characterization and Interpretation of Physico-Mechanical Properties

Materials ◽  
2019 ◽  
Vol 12 (24) ◽  
pp. 4057 ◽  
Author(s):  
Izabela Maria Barszczewska-Rybarek
Keyword(s):  
Mechanical Properties ◽  
Chemical Structure ◽  
Structural Parameters ◽  
Polymer Network ◽  
Polymer Networks ◽  
Impact Resistance ◽  
Organic Matrices ◽  
Dental Restorative

Material characterization by the determination of relationships between structure and properties at different scales is essential for contemporary material engineering. This review article provides a summary of such studies on dimethacrylate polymer networks. These polymers serve as photocuring organic matrices in the composite dental restorative materials. The polymer network structure was discussed from the perspective of the following three aspects: the chemical structure, molecular structure (characterized by the degree of conversion and crosslink density (chemical as well as physical)), and supramolecular structure (characterized by the microgel agglomerate dimensions). Instrumental techniques and methodologies currently used for the determination of particular structural parameters were summarized. The influence of those parameters as well as the role of hydrogen bonding on basic mechanical properties of dimethacrylate polymer networks were finally demonstrated. Mechanical strength, modulus of elasticity, hardness, and impact resistance were discussed. The issue of the relationship between chemical structure and water sorption was also addressed.

scholarly journals Multiply Interpenetrating Polymer Networks: Preparation, Mechanical Properties, and Applications

Gels ◽  
2019 ◽  
Vol 5 (3) ◽  
pp. 36 ◽  
Author(s):  
Panayiota A. Panteli ◽  
Costas S. Patrickios
Keyword(s):  
Mechanical Properties ◽  
Electrical Conductivity ◽  
Polymer Network ◽  
Polymer Networks ◽  
Interpenetrating Polymer Networks ◽  
Interpenetrating Polymer Network ◽  
Low Friction ◽  
Friction Coefficients ◽  
Polymeric Component ◽  
Work Done

This review summarizes work done on triply, or higher, interpenetrating polymer network materials prepared in order to widen the properties of double polymer network hydrogels (DN), doubly interpenetrating polymer networks with enhanced mechanical properties. The review will show that introduction of a third, or fourth, polymeric component in the DNs would further enhance the mechanical properties of the resulting materials, but may also introduce other useful functionalities, including electrical conductivity, low-friction coefficients, and (bio)degradability.

Decoupling of the Chemical and Mechanical Surface Contributions in a Force Curve Measurement with AFM

2003 ◽  
Vol 778 ◽  
Author(s):  
Olivier Noel ◽  
Maurice Brogly ◽  
Gilles Castelein ◽  
Jacques Schultz
Keyword(s):  
Mechanical Properties ◽  
Surface Properties ◽  
Adhesion Force ◽  
Force Measurement ◽  
Mechanical Energy ◽  
Polymer Network ◽  
Polymer Networks ◽  
Model Systems ◽  
Silicon Substrates ◽  
Contact Mode

AbstractAtomic Force Microscope (AFM) was used to perform surface force measurements in contact mode to investigate surface properties of model systems at the nanoscale. Model systems were considered and compared. The first one was related to systems of controlled chemical surface properties with identical mechanical properties (chemically modified silicon substrates with hydroxyl, amine, methyl and ester functional groups). The second one deals with model polymer networks (Cross-linked polydimethylsiloxane or PDMS) of controlled mechanical properties and identical surface chemistry. The third system consists in a model polymer network, whose surface is chemically controlled with the same groups as before with silicon substrates. The results show that the viscoelastic contribution is dominating in the adhesion force measurement. Finally, we propose a relationship (derived from the Gent and Schultz's one), which expresses the AFM adhesion force as a function of mechanical energy dissipated in the contact and the surface properties of the material.

Role of polymer network and gelation kinetics on the mechanical properties and adsorption capacity of chitosan hydrogels for dye removal

2017 ◽  
Vol 55 (24) ◽  
pp. 1843-1849 ◽  
Author(s):  
Martina Salzano de Luna ◽  
Rosaria Altobelli ◽  
Lucia Gioiella ◽  
Rachele Castaldo ◽  
Giuseppe Scherillo ◽  
...  
Keyword(s):  
Mechanical Properties ◽  
Adsorption Capacity ◽  
Dye Removal ◽  
Polymer Network ◽  
Gelation Kinetics ◽  
Chitosan Hydrogels

scholarly journals Challenges and limits of Mechanical Stability in 3D Direct Laser Writing

2021 ◽  
Author(s):  
Elaheh Sedghamiz ◽  
Modan Liu ◽  
Wolfgang Wenzel
Keyword(s):  
Mechanical Properties ◽  
Aspect Ratio ◽  
Mechanical Stability ◽  
Polymer Network ◽  
Polymer Networks ◽  
Ultrashort Laser Pulses ◽  
Dynamics Simulation ◽  
Direct Laser Writing ◽  
Laser Writing ◽  
Direct Laser

Abstract Direct laser writing is an effective technique for fabrication of complex polymeric 3D polymer networks using ultrashort laser pulses. Practically, it remains a challenge to design and fabricate high performance materials with different functions that possess a combination of high strength, substantial ductility, and tailored functionality, in particular for small feature sizes. To date, it is difficult to obtain a time-resolved microscopic picture of the printing process in operando. To close this gap, we herewith present a molecular dynamics simulation approach to model direct laser writing and investigate the effect of writing condition and aspect ratio on the mechanical properties of the printed polymer network. We show that writing condition provides a possibility to tune the mechanical properties and an optimum writing condition can be applied to fabricate structures with improved mechanical properties. We reveal that beyond the writing parameters, aspect ratio plays an important role to tune the stiffness of the printed structures.

Determination of mechanical properties of artificial turf football pitches according to structural components

2017 ◽  
Vol 232 (2) ◽  
pp. 131-139 ◽  
Author(s):  
Javier Sánchez-Sánchez ◽  
Pascal Haxaire ◽  
Jorge García Unanue ◽  
José L Felipe ◽  
Ana M Gallardo ◽  
...  
Keyword(s):  
Mechanical Properties ◽  
Structural Parameters ◽  
Base Material ◽  
Structural Components ◽  
Artificial Turf ◽  
Force Reduction ◽  
Pile Length ◽  
Selection Of

Structural components of artificial turf football pitches have been improved in the last decade. The aim of this study was to explore the influence of structural components on the in situ mechanical behaviour of third-generation artificial turf football pitches. In total, 21 pitches were analysed according to the specified FIFA procedures. The results revealed that each of the pitches complies with the requirements of FIFA regulations. Pile length sample, stabilising bulk density, tuft/m2 and sub-base material all demonstrated a significant influence on the mechanical properties of the surface ( p < 0.05). Finally, the selected structural parameters explained 77.9%, 59.8% and 54.3% of variance in rotational traction, vertical deformation and force reduction, respectively. These results show the importance of the selection of the structural components in the design of artificial turf football pitches.

scholarly journals The Role of Structure on Mechanical Properties of Nonwoven Fabrics

2001 ◽  
Vol os-10 (2) ◽  
pp. 1558925001OS-01 ◽  
Author(s):  
H.S. Kim ◽  
B. Pourdeyhimi
Keyword(s):  
Mechanical Properties ◽  
Structural Changes ◽  
Maximum Stress ◽  
Structural Parameters ◽  
Bonding Temperature ◽  
Tensile Modulus ◽  
Orientation Distribution ◽  
Nonwoven Fabrics ◽  
Fiber Orientation Distribution

The mechanical properties, namely, tensile modulus, maximum stress in tension and elongation at maximum stress of thermally point-bonded nonwoven fabrics with different bonding temperature have been evaluated. Image acquisition and analysis techniques have been used to quantify structural parameters such as fiber orientation distribution function, bond-region strain, and unit cell strain during controlled-deformation experiments and to identify failure mechanisms. We have shown that an in situ experimental visualization and measurement of the structural changes occurring during controlled-deformation experiments can help establish links between mechanical properties and the structure properties of nonwoven fabrics.

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