scholarly journals Paraffin Pickering Emulsion Stabilized with Nano-SiO2 Designed for Wood Impregnation

Forests ◽  
2020 ◽  
Vol 11 (7) ◽  
pp. 726
Author(s):  
Runhao Liu ◽  
Xinyao Liu ◽  
Yuting Zhang ◽  
Junjia Liu ◽  
Chengxi Gong ◽  
...  
Keyword(s):  
Thermal Stability ◽  
Water Resistance ◽  
Storage Stability ◽  
Treated Wood ◽  
High Water ◽  
Pickering Emulsion ◽  
Special Equipment ◽  
Nano Sio2 ◽  
Wood Impregnation ◽  
Thermal Stability Of

Wax impregnation is an effective approach to improve wood water resistance. However, melted waxes require special equipment and cannot penetrate deep enough into wood. Recently, wax emulsions show excellent efficiency in wood modification. In this study, paraffin Pickering emulsion stabilized by low dispersed SiO2 nanospheres was used to impregnate poplar wood. The microstructure and storage stability of the emulsion were evaluated. The dimensional stability, water uptake, wettability, and thermal stability of treated wood were also investigated. After homogenization, a milk-white oil-in-water (O/W) paraffin Pickering emulsion stabilized by the nano-SiO2 (diameter of ~76 nm) was formed and demonstrated excellent storage stability. Paraffin Pickering emulsion could penetrate into the wood structure. The emulsion-treated wood was endowed with a moderate anti-swelling efficiency (ASE), high water resistance, and low wettability. Moreover, the addition of nano-SiO2 could improve the thermal stability of the treated wood.

scholarly journals Effects of aluminum sulfate soaking pretreatment on dimensional stability and thermostability of heat-treated wood

2020 ◽  
Author(s):  
Lijie Qu ◽  
Zhenyu Wang ◽  
Jing Qian ◽  
Zhengbin He ◽  
Songlin Yi
Keyword(s):  
Heat Treatment ◽  
Thermal Stability ◽  
Thermal Degradation ◽  
Structural Changes ◽  
Aluminum Sulfate ◽  
Treated Wood ◽  
Treatment Temperature ◽  
Chinese Fir ◽  
Heat Treated ◽  
Thermal Stability Of

Abstract Acidic aluminum sulfate hydrolysis solutions can be used to catalyze the thermal degradation of wood in a mild temperature environment, and thus reduce the temperature required for heat treatment process. To improve the dimensional and thermal stability of Chinese fir during heat treatment at 120 °C, 140 °C and 160 °C, this study investigated the effects of soaking pretreatment with 5%, 10% and 15% aluminum sulfate on the chemical and structural changes of the heat-treated Chinese fir. The results indicated that the samples treated at 15% aluminum sulfate concentration and 160 °C heat treatment achieved the best dimensional and thermal stability. Chemical analyses by Fourier transform infrared spectroscopy (FTIR) and X-ray diffraction (XRD) indicated that the catalysis of aluminum sulfate resulted in degradation of hemicelluloses during the heat treatment, and an increase in the soaking concentration and heat treatment temperature also affected the thermal degradation of celluloses. The scanning electron microscope (SEM) and mass changes test results proved that the hydrolyzed aluminum flocs mainly adhered to the inner wall of the wood tracheid as spherical precipitates, and when the soaking concentration reached 10% and 15%, a uniform soaking effect could be achieved. The thermogravimetric (TG) analysis revealed the soaking pretreatment effectively improved the thermal stability of the heat-treated wood by physically wrapping and promoting the formation of a carbon layer on the wood surface during heat treatment. Thus, aluminum sulfate soaking pretreatment exerted a great effect on the dimensional and thermal stability of wood, allowing heat treatment to be performed at a lower temperature.

Study on Acrylic Emulsion Adhesive Modified by Double Siloxane

2013 ◽  
Vol 395-396 ◽  
pp. 367-370
Author(s):  
Cai Hua Gao ◽  
Wen Lu Guo ◽  
Zhi Ming Jin
Keyword(s):  
Thermal Stability ◽  
Comparative Study ◽  
Heat Resistance ◽  
Chemical Process ◽  
Water Resistance ◽  
Orthogonal Experiment ◽  
Acrylic Emulsion ◽  
Macroscopic Properties ◽  
The Stability ◽  
Thermal Stability Of

The acrylic emulsion adhesive was modified by D4 and KH570 with chemical process, and we can get the modified product successfully via the best technology parameter which was confirmed by orthogonal experiment. The structure of acrylic was characterized by FTIR, while there was a comparative study on the macroscopic properties and thermal stability of the unmodified and modified product. The results showed that when m(D4):m(KH570) was 2:1, the dosage of emulsifier was 3.0%, the dosage of KPS was 4.0%, the monomer(soft and hard) ratio was 1:1, the stability of the acrylic emulsion adhesive modified by double siloxane was good, and its viscosity, water resistance, heat resistance were improved greatly.

Preparation and Properties of Silane-Terminated Poly(urethane-Imide)

2013 ◽  
Vol 690-693 ◽  
pp. 1577-1580
Author(s):  
Xiao Xi Hu ◽  
Yun Wang
Keyword(s):  
Thermal Stability ◽  
Water Resistance ◽  
Tensile Tests ◽  
Mechanical Analysis ◽  
Gravimetric Analysis ◽  
Thermal Gravimetric ◽  
Silane Coupling ◽  
Ft Ir ◽  
And Storage ◽  
Thermal Stability Of

A serious of silane-terminated poly (urethane-imide) (Si-PUI) was synthesized via prepolymer method using polycarbonatediols (PCDL), 2,4-tolylene diisocyanate (TDI), 4,4'-Oxydiphthalic Anhydride (ODPA) and silane coupling agent KH-550. The structure of the products was characterized by FT-IR. The thermal properties were measured by thermal gravimetric analysis (TGA). The thermal mechanical behavior was investigated by dynamic mechanical analysis (DMA).The mechanical characteristic was measured by tensile tests. The water absorption (Wa) was also been tested. With the imide content increasing, the thermal stability, tensile strength and storage modulus of poly (urethane-imide) improve significantly, and the glass transition temperature rises. The introduction of silanes improves the water resistance and further enhances the thermal stability of poly (urethane-imide).

The properties of sericin/poly(vinyl alcohol) films modified by boric acid

e-Polymers ◽  
2010 ◽  
Vol 10 (1) ◽  
Author(s):  
Qun Wang ◽  
Lu Qi
Keyword(s):  
Mechanical Properties ◽  
Thermal Stability ◽  
Boric Acid ◽  
Vinyl Alcohol ◽  
Water Resistance ◽  
Poly Vinyl Alcohol ◽  
Scanning Calorimetry ◽  
Blend Ratio ◽  
Percutaneous Drug Delivery ◽  
Thermal Stability Of

AbstractA group of films mainly composed of sericin and poly(vinyl alcohol) (PVA), using boric acid (BA) as a modifier, were prepared by a technique of solution casting. In this work, the effect of BA and sericin on the mechanical properties and water resistance of the films was analyzed, the interior morphology of the films were described by a scanning electron microscopy (SEM), the thermal stability of the films was characterized by differential scanning calorimetry (DSC), and the reaction mechanism was proposed according to the previous literature and the test of Fourier transform infrared spectrum (FTIR). Results indicated that, the properties of the membrane were the functions of the blend ratio of sercin to PVA and the content of BA. The use of BA increased the tensile strength, improved the water resistance and the thermal stability, and varied the interior morphology of the films. The content of sericin greatly influenced the combination of properties of the films, especially the mechanical properties, interior morphology, thermal stability, and water resistance reducing with the increasing of sericin content. The films have potential to be used in materials, such as skin-care coatings for beauty, percutaneous drug delivery systems for exterior intact skin, due to the characteristics of the components and the good mechanical properties of the films.

Improved thermal stability of phenolic resin by graphene-encapsulated nano-SiO2 hybrids

2018 ◽  
Vol 135 (4) ◽  
pp. 2377-2387 ◽  
Author(s):  
Juan Chen ◽  
Wenbo Zhang ◽  
Jing Liu ◽  
Heyi Ge ◽  
Moufeng Tian ◽  
...  
Keyword(s):  
Thermal Stability ◽  
Phenolic Resin ◽  
Nano Sio2 ◽  
Thermal Stability Of

Epoxy Resin (EP) / Nano-SiO2 Composite Material Preparation by Two Processes

2013 ◽  
Vol 652-654 ◽  
pp. 127-130
Author(s):  
Ying Na Zhao ◽  
Xiong Feng Zeng ◽  
Wen Li Zhang
Keyword(s):  
Thermal Stability ◽  
Composite Material ◽  
Comprehensive Evaluation ◽  
Sol Gel ◽  
Curing Agent ◽  
Spectra Analysis ◽  
Nano Sio2 ◽  
Ep Matrix ◽  
Material Preparation ◽  
Thermal Stability Of

Ultrasonic wave (UW) and sol-gel (SG) technology were using to preprocess the nano-SiO2, and the SiO2/EP composites were prepared by adding coupling agent KH-550, curing agent T-31 and different contents SiO2 into EP matrix. Using infrared spectra analysis tested the samples’ structures and the thermal stability of two preparation processes were tested by TG. The results indicated that, the thermal stability of the SiO2/EP composites by UW preprocess was improved about 25 oC -60 oC when compared with pure EP and the SiO2/EP composites by SG. Comparing to the comprehensive evaluation of thermal stability of different SiO2 contents SiO2/EP composites, the most optimum additive of nano-SiO2 was about 10 wt. % by UW process.

Effect of acetylacetone metal salts on curing mechanism and thermal stability of polybenzoxazine

2020 ◽  
Vol 32 (8) ◽  
pp. 953-962
Author(s):  
Hongqiang Yan ◽  
Jianan Hu ◽  
Huaqing Wang ◽  
Zuomin Zhan ◽  
Jie Cheng ◽  
...  
Keyword(s):  
Thermal Stability ◽  
Catalytic Activity ◽  
Photoelectron Spectroscopy ◽  
High Water ◽  
Carbon Layer ◽  
Metal Salts ◽  
High Catalytic Activity ◽  
Scanning Calorimetry ◽  
Activity Structure ◽  
Thermal Stability Of

To overcome high water absorption of inorganic metal salts and their poor compatibility with resin, acetylacetone metal salts (M(acac) n) were selected as the catalysts of benzoxazine resin. Their effects on the catalytic activity, structure, and thermal stability of polybenzoxazine had been estimated by dynamic differential scanning calorimetry, in situ Fourier transform infrared spectroscopy, X-ray photoelectron spectroscopy, and thermal gravimetric analyzer. The results revealed that M(acac) n of iron (Fe3+), cobalt (Co3+ and Co2+), and copper (Cu2+) exhibited high catalytic activity and reduced evidently activation energy, especially acetylacetone iron salt. The addition of M(acac) n was beneficial to the formation of Ph–N–Ph structure, which was easy to form a denser carbon layer during thermal degradation, prevented heat transfer and further decomposition of the resin, and finally led to the increase of carbon residue at high temperature.

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