Evaluation of a photo-initiated copper(I)-catalyzed azide-alkyne cycloaddition polymer network with improved water stability and high mechanical performance as an ester-free dental restorative

2021 ◽  
Vol 37 (10) ◽  
pp. 1592-1600
Author(s):  
Xiance Wang ◽  
Guangzhe Gao ◽  
Han Byul Song ◽  
Xinpeng Zhang ◽  
Jeffrey W. Stansbury ◽  
...  
Keyword(s):  
Mechanical Performance ◽  
Polymer Network ◽  
Water Stability ◽  
Dental Restorative

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.

Clinically Applicable Self-Healing Dental Resin Composites

MRS Advances ◽  
2016 ◽  
Vol 1 (8) ◽  
pp. 547-552 ◽  
Author(s):  
George Huyang ◽  
Jirun Sun
Keyword(s):  
Fracture Toughness ◽  
Mechanical Performance ◽  
Dental Composite ◽  
Propagation Path ◽  
Self Healing ◽  
Dental Resin ◽  
Micro Cracks ◽  
Restoration Failure ◽  
Functional Components ◽  
Dental Restorative

ABSTRACTSelf-healing is one of the most desired material properties. Herein, we present the design and development of a new self-healing dental composite (SHDC) that can heal micro-cracks autonomously. The SHDC has two functional components in addition to contemporary dental composites: healing powder (HP) and healing liquid (HL) encapsulated in silica microcapsules. The autonomous healing is triggered by micro-cracks which fracture microcapsules in their propagation path and release the HL. As a consequence, the released HL dissolves and reacts with the HP, and then fill the micro-cracks with a cement-like new material. This 3-step crack-release-heal process prevents micro-cracks from causing restoration failure, thus improving the service life of dental restorative material. The mechanical performance of the SHDC prepared were evaluated in terms of elastic modulus and fracture toughness, which were in the upper level compared to commercial dental restorative materials, and the self-healing capability was confirmed through fracture toughness recovery test. In addition, the SHDCs were made with clinically-tested, biocompatible materials, which makes them readily applicable as medical devices.

scholarly journals Mechanical performance of novel bioactive glass containing dental restorative composites

2013 ◽  
Vol 29 (11) ◽  
pp. 1139-1148 ◽  
Author(s):  
D. Khvostenko ◽  
J.C. Mitchell ◽  
T.J. Hilton ◽  
J.L. Ferracane ◽  
J.J. Kruzic
Keyword(s):  
Bioactive Glass ◽  
Mechanical Performance ◽  
Restorative Composites ◽  
Dental Restorative ◽  
Dental Restorative Composites

Thermally-Induced Actuation of Magnetic Nanocomposites Based on Oligo(ω-Pentadecalactone) and Covalently Integrated Magnetic Nanoparticles

MRS Advances ◽  
2018 ◽  
Vol 3 (63) ◽  
pp. 3783-3791 ◽  
Author(s):  
M. Yasar Razzaq ◽  
M. Behl ◽  
A. Lendlein
Keyword(s):  
Magnetic Nanoparticles ◽  
Mechanical Performance ◽  
Shape Memory Polymer ◽  
Polymer Network ◽  
Polymer Networks ◽  
Melting Range ◽  
Magnetite Nanoparticle ◽  
Thermally Induced ◽  
Inorganic Particles ◽  
Chain Mobility

AbstractThe incorporation of inorganic particles in a polymer matrix has been established as a method to adjust the mechanical performance of composite materials. We report on the influence of covalent integration of magnetic nanoparticles (MNP) on the actuation behavior and mechanical performance of hybrid nanocomposite (H-NC) based shape-memory polymer actuators (SMPA). The H-NC were synthesized by reacting two types of oligo(ω-pentadecalactone) (OPDL) based precursors with terminal hydroxy groups, a three arm OPDL (3AOPDL, Mn = 6000 g mol·1-1) and an OPDL (Mn =3300 g · mol-1) coated magnetite nanoparticle (Ø = 10 ± 2 nm), with a diisocyanate. These H-NC were compared to the homopolymer network regarding the actuation performance, contractual stress (σcontr) as well as thermal and mechanical properties. The melting range of the OPDL crystals (ΔTm,OPDL) was shifted in homo polymer networks from 36 °C – 76 °C to 41°C – 81 °C for H-NC with 9 wt% of MNP content. The actuators were explored by variation of separating temperature (Tsep), which splits the OPDL crystalline domain into actuating and geometry determining segments. Tsep was varied in the melting range of the nanocomposites and the actuation capability and contractual stress (σcontr) of the nanocomposite actuators could be adjusted. The reversible strain (εrev) was decreased from 11 ± 0.3% for homo polymer network to 3.2±0.3% for H-NC9 with 9 wt% of MNP indicating a restraining effect of the MNP on chain mobility. The results show that the performance of H-NCs in terms of thermal and elastic properties can be tailored by MNP content, however for higher reversible actuation, lower MNP contents are preferable.

scholarly journals The Influence of Nanoclay on the Flame Retardancy and Mechanical Performance of Recycled Carpet Composites

Recycling ◽  
2019 ◽  
Vol 4 (2) ◽  
pp. 22
Author(s):  
Kunal Mishra ◽  
Ranji Vaidyanathan
Keyword(s):  
Flame Retardancy ◽  
Moisture Absorption ◽  
Mechanical Performance ◽  
Ignition Time ◽  
Polymer Network ◽  
Degradation Process ◽  
Condensation Condition ◽  
Recycled Waste ◽  
Composite Samples ◽  
Vartm Process

In the present study, we recycled waste carpet using a vacuum-assisted resin transfer molding (VARTM) process. Three different variations of carpet composites were fabricated, namely, neat epoxy, clay-coated, and clay-infused carpet composites. The carpet composite samples were degraded hygrothermally as well as under a cyclic UV condensation condition. Presence of clay was shown to impede the moisture absorption and UV degradation in the carpet composites. Flexural properties also showed that the presence of clay slows the degradation process of the composites. The flame retardancy result indicated that the presence of clay in the polymer network decreases the ignition time of the carpet composites.

Improvement in Mechanical Performance of Anionic Hydrogels Using Full-Interpenetrating Polymer Network Reinforced with Graphene Oxide Nanosheets

2016 ◽  
Vol 35 (4) ◽  
pp. 386-395 ◽  
Author(s):  
MALIHE KHEIRABADI ◽  
REZA BAGHERI ◽  
KOUROSH KABIRI ◽  
DMITRI A. OSSIPOV ◽  
EFFAT JOKAR ◽  
...  
Keyword(s):  
Graphene Oxide ◽  
Mechanical Performance ◽  
Polymer Network ◽  
Interpenetrating Polymer Network ◽  
Graphene Oxide Nanosheets

Freeze-etch TEM of aqueous polymer gel network morphology

1986 ◽  
Vol 44 ◽  
pp. 796-797
Author(s):  
J. A. N. Zasadzinski ◽  
R. K. Prud'homme
Keyword(s):  
Metal Ion ◽  
Polymer Network ◽  
Polymer Gels ◽  
Polymer Gel ◽  
Deformation History ◽  
Crosslinked Polymer ◽  
Aqueous Polymer ◽  
History Of ◽  
Gel Network ◽  
Network Morphology

The rheological and mechanical properties of crosslinked polymer gels arise from the structure of the gel network. In turn, the structure of the gel network results from: thermodynamically determined interactions between the polymer chain segments, the interactions of the crosslinking metal ion with the polymer, and the deformation history of the network. Interpretations of mechanical and rheological measurements on polymer gels invariably begin with a conceptual model of,the microstructure of the gel network derived from polymer kinetic theory. In the present work, we use freeze-etch replication TEM to image the polymer network morphology of titanium crosslinked hydroxypropyl guars in an attempt to directly relate macroscopic phenomena with network structure.

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