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Bio-based vitrimer-like polyurethane based on dynamic imine bond with high-strength, reprocessability, rapid-degradability and antibacterial ability
Bio-based polyurethane Vitrimer-like Imine bond Rapidly-degradable Antibacterial property
2023/12/8
Synthesis of vitrimer with dynamic?covalent bond?is a surprising solution to overcome the inherent limitations of traditional?thermosets. A bio-based vitrimer-like?polyurethane?formed by?castor oil,?v...
High-strength and self-healable poly (acrylic acid) /chitosan hydrogel with organic-inorganic hydrogen bonding networks
Self-healing hydrogel Hydrogen bonding Organic-inorganic
2023/12/8
Bentonite?is a natural clay mineral with high cationic exchange properties and plays an important role in organic-inorganic composite hydrogels. We report an organic-inorganic cross-linked self-healin...
Developing Reprocessable shape memory thermosetting resins with high thermal resistance and strength through building a crosslinked network based on bismaleimide and epoxy resins
dynamic covalent bond heat resistance mechanical property reprocessability shape memory thermosetting resin
2023/11/16
It is difficult to endow reprocessable shape memory thermosetting resins with outstanding heat resistance and high mechanical strength. Herein, a new kind of reprocessable shape memory thermosetting r...
An injectable self-healing hydrogel-cellulose nanocrystals conjugate with excellent mechanical strength and good biocompatibility
Cellulose nanocrystals (CNCs) Graft Nanocomposite hydrogel Reversible covalent bond Self-healing
2024/2/5
In this work, a novel strategy for the construction of injectable self-healing nanocomposite (NC) hydrogels dominated by reversible boronic ester bonds was demonstrated. Specifically, NC hydrogels wer...
Influence of beech particle size used in surface layer on bending strength of three-layer particle board
particleboard bending strength beech particles particle size surface layer compaction ratio
2009/11/26
It is well known that wood species and particle size used influence the bending strength of the three-layer particleboard. The purpose of this research was to determine how the size of beech (Fagus sy...
Development of Timber Portal Frames Composed of Compressed LVL Plates and Pins III.Strength properties of timber portal frames composed of compressed LVL beam-to-column joints and steel column-to-base joints
compressed LVL joint timber portal frame racking test beam-to-column joint column-to-base joint
2009/11/23
We made timber portal frames composed of compressed LVL beam-to-column joints and steel column-to-base joints. The former used compressed LVL plates and compressed LVL pins and the latter used steel p...
Effects of Forest Management Using Pruning and Thinning on Wood Quality and Strength Properties of Sugi Planted in Shimane Prefecture II.Relationship between forest management, and visual grading and bending properties of boxed-heart square timbers
planted sugi trees forest management visual grading bending properties
2009/11/23
The aim of this study was to clarify the effects of forest management such as pruning and thinning on the visual grading and bending properties of boxed-heart square timbers of sugi (Cryptomeria japon...
Rational Timber Frame Structure Jointed with Glass Fiber Reinforced Nylon Plate II.Strength properties of drift-pin joints under static loading
GFRP drift-pin timber joint tension resistance shear resistance
2009/11/23
A new drift-pin joint consisting of a glass-fibre-reinforced nylon (GFRP) plate inserted into a slit of the timber with steel pipe drift-pins was designed. In the previous report, basic shear properti...
Fracture Morphology and Effect of Compression Volume on Tensile Strength of Compressed Wood
compressed wood compression ratio density elastic modulus tensile strength
2009/3/6
Tensile strength property of sugi wood (Cryptomeria japonica D. Don) compressed to various ratio was examined, and the relationship between the effect of compression volume and the morphological break...
Static and impact bending strength properties of aged keyaki and akamatsu woods
aged wood strength properties bending test impact bending test
2009/3/6
Mechanical properties, namely modulus of rupture (MOR), modulus of elasticity in bending (MOE) and impact bending strength, were measured with small clear test specimens of new and aged wood. The test...
Trends and Views of the Study of Wood Strength and Timber Construction
Wood Strength Timber Construction
2009/3/6
Trends and Views of the Study of Wood Strength and Timber Construction.
Shearing Strength and Fracture Mechanism of Lath-mortar Wall I
Conventional wooden structure External finishing Mortal wall Staple joint Earthquake resistant design
2009/3/6
This research dealt with the shearing strength properties of mortar exterior walls with wooden lath which are used for conventional wooden house. The information is needed because mortar walls detach ...
Evaluation of the Shear Strength of Lumber by Different Test Methods
shear strength block shear full-scale three-point bending five-point bending
2009/3/6
Four kinds of shear tests, i.e., JIS block, full-scale block, three-point bending and five-point bending, were conducted to predict the shear strength of the difficult to perform bending method from t...
Effect of Longitudinal Shear Plane Length on the Tensile Strength of Half-Lapped “gooseneck” Splice Joints（Kama-tsugi）
kama-tsugi shear plane length tensile strength strain distribution analysis
2009/3/6
Strain distribution analysis of half-lapped “gooseneck” splice joints (Kama-tsugi) was carried out using digital image correlation. The effect of the shear plane length on the tensile strength of the...
Standardization of Testing and Evaluation Method for Full-size Structural Timber Strength in Japan
testing method evaluation method full-size timber strength characteristic value
2009/3/6
ISO published the international standard ISO 13910 concerning the testing and evaluation method for full-size structural timber strength in 2005, and this will influence the standard of Japan in the f...