scholarly journals Surface Treatment of Composites with Bismaleimide Resin-Based Wet Peel Ply for Enhanced Adhesive Bonding Performance

Polymers ◽  
2021 ◽  
Vol 13 (20) ◽  
pp. 3488
Author(s):  
Hongfeng Li ◽  
Liwei Zhao ◽  
Yingjie Qiao ◽  
Xuefeng Bai ◽  
Dezhi Wang ◽  
...  
Keyword(s):  
Shear Strength ◽  
Surface Treatment ◽  
Bonding Strength ◽  
Adhesive Bonding ◽  
Retention Rate ◽  
Bismaleimide Resin ◽  
Bonding Performance ◽  
Composite Joint ◽  
The Matrix ◽  
Peel Ply

Surface treatment is typically required to improve the bonding performance of carbon-fiber-reinforced composites. Herein, a wet peel ply was prepared using bismaleimide (BMI) resins as a matrix resin. The temperature–heating rate extrapolation method and rheological method were employed to study the reaction characteristics and viscosity-temperature characteristics of the matrix in the BMI wet peel ply. The curing temperatures of the BMI wet peel ply and the BMI prepreg were the same (200 °C), making this wet peel ply suitable for co-curing with the BMI prepreg. After treatment with the wet peel ply, the bonding strength of the BMI composite joint showed a mean shear strength of 35.5 MPa, which was 1.72% higher than that of the sanded composite and 17.5% higher than that of the composite treated with the dry peel ply. In addition, the BMI composite treated with the BMI wet peel ply exhibited good bonding stability with a coefficient of variation of 3.9. After damp-heat aging for 1440 h, the retention rate of shear strength at room-temperature was 82.3%. The relatively loosely woven carrier in the BMI wet peel ply increased the surface roughness of the composite, thus improving the bonding strength.

scholarly journals Effects of Er:YAG laser pre-treatment on dentin structure and bonding strength of primary teeth: An in vitro study

2020 ◽  
Author(s):  
Jun hui WANG ◽  
Kuan YANG ◽  
Bai ze ZHANG ◽  
Zhi fei ZHOU ◽  
Zi rui WANG ◽  
...  
Keyword(s):  
Shear Strength ◽  
Surface Treatment ◽  
Bonding Strength ◽  
Primary Teeth ◽  
Er:Yag Laser ◽  
Testing Machine ◽  
Acid Etching ◽  
Control Group ◽  
Interface Failure ◽  
Pre Treatment

Abstract Background: To investigate the effects of Er:YAG laser pre-treatment on the dentin structure and shear bond strength of primary teeth.Methods: Dentin specimens were prepared using freshly extracted intact primary molars and divided randomly into four groups based on the surface treatment applied. The control and etchant groups received no treatment and conventional acid etching treatment, respectively, while the energy and frequency groups received laser surface treatment with variable energy (50-300 mJ) and frequency (5-30 Hz) parameters. The morphology was observed using scanning electron microscopy. The surface-treated dentin slices were bonded to resin tablets, followed by thermocycle treatment. The shear strength was determined using a universal testing machine and de-bonded surfaces were observed using a stereomicroscope.Results: SEM observation showed that the surface morphology of the dentin slices changed after etching as well as after Er:YAG laser pre-treatment with different energy and frequency values. The dentin tubules opened within a specific energy (50-200 mJ) and frequency (5-20 Hz) range. Beyond this range, the intertubular dentin showed cracks and structural disintegration. Shear strength tests showed no significant changes after acid etching. The shear strength increased significantly (P<0.05) after Er:YAG laser pre-treatment compared with that of the control group. The shear strength increased within the same energy (50-200 mJ) and frequency (5-20 Hz) range as the tubule opening, but not significantly (P>0.05). The most common mode of interface failure was adhesive (interface) failure, followed by mixed and resin cohesive failure.Conclusions: Pre-treatment using Er:YAG laser opens the dentinal tubules without the formation of a smear layer and improves the bonding strength between the primary teeth dentin and the resin composites.

Chromium-Free Surface Pre-Treatment of Aluminum for Adhesive Bonding

2010 ◽  
Author(s):  
S. L. Ngoh ◽  
S. C. Tan ◽  
C. S. Goh ◽  
J. Wei
Keyword(s):  
Free Surface ◽  
Bonding Strength ◽  
Adhesive Bonding ◽  
Surface Preparation ◽  
Treatment Method ◽  
Solution Concentration ◽  
Bonding Performance ◽  
Initial Adhesion ◽  
Vital Effect ◽  
Pre Treatment

Adhesive bonding offers many advantages, such as light weight, ease of manufacturing, corrosion resistance and more uniform stress distribution at joint. In order to achieve good initial adhesion and durability of adhesive bonded aluminum joint, pre-treatment of the aluminum substrate is essential. Some of the surface pre-treatment procedures commonly used are chromium-based chemical and electro-chemical methods. However, due to the environmental and health concerns, and legislation to ban the use of hexavalent chromium, there is a need to omit the use of chromium-based pre-treatment methods in the surface preparation process. Therefore, this work aims to study the effect of the developed hybrid chromium-free surface pre-treatment method on the bonding strength of adhesive bonded aluminum joint. The study on the effects of solution concentration level and processing time of the hybrid treatment on the bonding strength suggests that bonding strength can be improved through enhancement of mechanical interlocking and increase of bonding area between the adhesive and adherend. Even though comparable or rougher surface morphologies were obtained from hybrid treatments as compared to the chromium-based treatment, lower bonding strengths were observed. This further suggests that the nano-scale level interaction between the adhesive and adherend has vital effect on the bonding performance.

scholarly journals Effects of Er:YAG laser pre-treatment on dentin structure and bonding strength of primary teeth: An in vitro study

2020 ◽  
Author(s):  
Jun hui WANG ◽  
Kuan YANG ◽  
Bai ze ZHANG ◽  
Zhi fei ZHOU ◽  
Zi rui WANG ◽  
...  
Keyword(s):  
Shear Strength ◽  
Surface Treatment ◽  
Bonding Strength ◽  
Primary Teeth ◽  
Er:Yag Laser ◽  
Testing Machine ◽  
Acid Etching ◽  
Control Group ◽  
Interface Failure ◽  
Pre Treatment

Abstract Background: To investigate the effects of Er:YAG laser pre-treatment on the dentin structure and shear bond strength of primary teeth. Methods: Dentin specimens were prepared using freshly extracted intact primary molars and divided randomly into four groups based on the surface treatment applied. The control and etchant groups received no treatment and conventional acid etching treatment, respectively, while the energy and frequency groups received laser surface treatment with variable energy and frequency parameters. The morphology was observed using scanning electron microscopy. The surface-treated dentin slices were bonded to resin tablets, followed by thermocycle treatment. The shear strengths were determined with a universal testing machine and de-bonded surfaces were observed with a stereomicroscope. Results: SEM observation showed that the surface morphology of the dentin slices changed after etching as well as after Er:YAG laser pre-treatment with different energy and frequency values. The dentin tubules opened within a specific energy (50-200 mJ) and frequency (5-20 Hz) range. Beyond this range, the intertubular dentin showed cracks and structural disintegration. Shear strength tests showed no significant change after acid etching. The shear strength increased significantly (P<0.05) after Er:YAG laser pre-treatment compared with that of the control group. The shear strength increased within the same energy (50-200 mJ) and frequency (5-20 Hz) range as the tubule opening, but not significantly (P>0.05). The most common mode of interface failure was adhesive (interface) failure, followed by mixed and resin cohesive failure. Conclusions: Er:YAG laser pre-treatment may improve the bonding strength between the dentin and the resin in primary teeth.

scholarly journals Effects of Er:YAG laser pre-treatment on dentin structure and bonding strength of primary teeth: an in vitro study

2020 ◽  
Vol 20 (1) ◽  
Author(s):  
Jun hui Wang ◽  
Kuan Yang ◽  
Bai ze Zhang ◽  
Zhi fei Zhou ◽  
Zi rui Wang ◽  
...  
Keyword(s):  
Shear Strength ◽  
Surface Treatment ◽  
Bonding Strength ◽  
Primary Teeth ◽  
Er:Yag Laser ◽  
Testing Machine ◽  
Acid Etching ◽  
Control Group ◽  
Interface Failure ◽  
Pre Treatment

Abstract Background To investigate the effects of Er:YAG laser pre-treatment on the dentin structure and shear bond strength of primary teeth. Methods Dentin specimens were prepared using freshly extracted intact primary molars and divided randomly into four groups based on the surface treatment applied. The control and etchant groups received no treatment and conventional acid etching treatment, respectively, while the energy and frequency groups received laser surface treatment with variable energy (50–300 mJ) and frequency (5–30 Hz) parameters. The morphology was observed using scanning electron microscopy. The surface-treated dentin slices were bonded to resin tablets, followed by thermocycle treatment. The shear strength was determined using a universal testing machine and de-bonded surfaces were observed using a stereomicroscope. Results SEM observation showed that the surface morphology of the dentin slices changed after etching as well as after Er:YAG laser pre-treatment with different energy and frequency values. The dentin tubules opened within a specific energy (50–200 mJ) and frequency (5–20 Hz) range. Beyond this range, the intertubular dentin showed cracks and structural disintegration. Shear strength tests showed no significant changes after acid etching. The shear strength increased significantly (P < 0.05) after Er:YAG laser pre-treatment compared with that of the control group. The shear strength increased within the same energy (50–200 mJ) and frequency (5–20 Hz) range as the tubule opening, but not significantly (P > 0.05). The most common mode of interface failure was adhesive (interface) failure, followed by mixed and resin cohesive failure. Conclusions Pre-treatment using Er:YAG laser opens the dentinal tubules without the formation of a smear layer and improves the bonding strength between the primary teeth dentin and the resin composites.

scholarly journals Tailoring Al–Li Alloy Surface Wettability with a Femtosecond Laser and Its Effect on Bonding Performance

Coatings ◽  
2021 ◽  
Vol 11 (8) ◽  
pp. 995
Author(s):  
Jun Chen ◽  
Yibo Li ◽  
Minghui Huang ◽  
Lei Dong
Keyword(s):  
Femtosecond Laser ◽  
Surface Treatment ◽  
Bonding Strength ◽  
Laser Scanning ◽  
Laser Surface ◽  
Surface Wettability ◽  
Alloy Surface ◽  
Laser Surface Treatment ◽  
Bonding Performance ◽  
Surface Micromorphology

In this study, a femtosecond laser was used to pretreat the surface of the Al–Li alloy, the surface micromorphology, roughness, contact angle, and surface wettability of which were adjusted by changing the laser scanning speed, and the sample was bonded into a single joint with polyether ether ketone (PEEK) adhesive. The mechanism of the laser surface treatment affecting the bonding strength of the Al–Li alloy was explored through tensile and shear experiments. The results indicated that optimizing the laser surface treatment parameters could change the surface roughness and surface micromorphology of the Al–Li alloy, so as to change its surface free energy and bonding strength. Compared with the untreated sample, the bonding strength of the Al–Li alloy increased by 81%, 95%, 107%, 91%, and 78% under the treatment of laser scanning at 25, 20, 15, 10, and 5 mm/s, respectively. As a whole, femtosecond laser etching of the Al–Li alloy surface had an important influence on its wettability and bonding performance.

Preparation and Formaldehyde Emission and Bonding Performance of Novel Modified Urea-Formaldehyde Resin Adhesive

2012 ◽  
Vol 490-495 ◽  
pp. 3476-3480 ◽  
Author(s):  
Zhen Zhong Gao ◽  
Chao Yue ◽  
Hai Bo Cao ◽  
Xiao Bo Wang ◽  
Xiao Feng Zhu ◽  
...  
Keyword(s):  
Bonding Strength ◽  
Adhesive Bonding ◽  
Urea Formaldehyde ◽  
Formaldehyde Emission ◽  
Urea Formaldehyde Resin ◽  
Molar Ratio ◽  
Formaldehyde Resin ◽  
Resin Adhesive ◽  
Bonding Performance ◽  
Addition Level

Low formaldehyde emission and high bonding strength were two basic criterions of a good urea-formaldehyde resin adhesive (UFRA). In our study, melamine modified methylolurea solution (MUS), was synthesized and used as modifier for UFRA. The bonding strength and formaldehyde emission of urea-formaldehyde resin adhesives(UFRA) were influenced by some factors such as F/U molar ratio of the main resin, F/U molar ratio of modifier, melamine content, mixing ratio of main resin with modifier, which were investigated by a series of single-factor experiments. The results showed that the best adhesive bonding strength of UFRA was 0.93MPa and the lowest formaldehyde emission was 0.43mg / L, when F/U molar ratio of the main resin was 1.5, F/U molar ratio of the MUS was 0.5, the mass fraction of melamine addition level was 5wt.% of MUS, and the mixing mass ratio of methylolurea solution (MUS) to the main UF resin was 20:80.

scholarly journals Effects of Er:YAG laser pre-treatment on dentin structure and bonding strength of primary teeth: An in vitro study

2020 ◽  
Author(s):  
Jun hui WANG ◽  
Kuan YANG ◽  
Bai ze ZHANG ◽  
Zhi fei ZHOU ◽  
Zi rui WANG ◽  
...  
Keyword(s):  
Shear Strength ◽  
Surface Treatment ◽  
Bonding Strength ◽  
Primary Teeth ◽  
Er:Yag Laser ◽  
Testing Machine ◽  
Acid Etching ◽  
Control Group ◽  
Interface Failure ◽  
Pre Treatment

Abstract Background: To investigate the effects of Er:YAG laser pre-treatment on the dentin structure and shear bond strength of primary teeth.Methods: Dentin specimens were prepared using freshly extracted intact primary molars and divided randomly into four groups based on the surface treatment applied. The control and etchant groups received no treatment and conventional acid etching treatment, respectively, while the energy and frequency groups received laser surface treatment with variable energy (50-300 mJ) and frequency (5-30 Hz) parameters. The morphology was observed using scanning electron microscopy. The surface-treated dentin slices were bonded to resin tablets, followed by thermocycle treatment. The shear strength was determined using a universal testing machine and de-bonded surfaces were observed using a stereomicroscope.Results: SEM observation showed that the surface morphology of the dentin slices changed after etching as well as after Er:YAG laser pre-treatment with different energy and frequency values. The dentin tubules opened within a specific energy (50-200 mJ) and frequency (5-20 Hz) range. Beyond this range, the intertubular dentin showed cracks and structural disintegration. Shear strength tests showed no significant changes after acid etching. The shear strength increased significantly (P<0.05) after Er:YAG laser pre-treatment compared with that of the control group. The shear strength increased within the same energy (50-200 mJ) and frequency (5-20 Hz) range as the tubule opening, but not significantly (P>0.05). The most common mode of interface failure was adhesive (interface) failure, followed by mixed and resin cohesive failure.Conclusions: Pre-treatment using Er:YAG laser opens the dentinal tubules without the formation of a smear layer and improves the bonding strength between the primary teeth dentin and the resin composites.

ALCOA 6061

Alloy Digest ◽  
2006 ◽  
Vol 55 (1) ◽  
Keyword(s):  
Corrosion Resistance ◽  
Shear Strength ◽  
Physical Properties ◽  
Surface Treatment ◽  
Tensile Properties ◽  
Data Sheet ◽  
Alloy 6061

Abstract Alloy 6061 is one of the most widely used alloys in the 6000 Series. This data sheet revision adds standard tempers and many of the Alcoa special tempers, as well as properties for extrusions and shapes. This datasheet provides information on composition, physical properties, hardness, elasticity, tensile properties, and shear strength. It also includes information on corrosion resistance as well as forming, machining, joining, and surface treatment. Filing Code: AL-281. Producer or source: Alcoa Engineered Products. Originally published May 1987, revised January 2006.

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