Papers by Author: Shuan Fa Chen

Paper TitlePage

Authors: Zeng Ping Zhang, Jian Zhong Pei, Shuan Fa Chen, Hong Zhao Du, Yong Wen
Abstract: Polyhedral oligomeric silsesquioxane (POSS) can be incorporated into polymers to obtain organic/inorganic hybrid materials. Octaepoxysilsesquioxane (E-POSS) with eight reactive epoxy groups per molecule is an important kind of POSS. E-POSS was cured with 4,4'-diaminodiphenylsulfone diamine (DDS) in this study. The curing kinetics of the E-POSS/DDS system was studied by using differential scanning calorimetry (DSC). Kinssinger and Flynn-Wall-Ozawa methods were used to obtain the activation energy and pre-exponential factor of the curing reaction.
1834
Authors: Zeng Ping Zhang, Guo Zheng Liang, Shuan Fa Chen
Abstract: Polyhedral oligomeric silsesquioxane (POSS) can be added to polymers to prepare the organic/inorganic hybrid materials. Octaepoxysilsesquioxane (E-POSS) containing eight reactive epoxy groups in a molecule is one of the important POSSs. E-POSS was cured with methylnadic anhydride (MNA) in this study. The curing kinetics of the E-POSS/MNA system was studied by using differential scanning calorimetry (DSC). Two different kinds of methods, Kinssinger and Flynn-Wall-Ozawa, were used to calculate the activation energy and pre-exponential factor of the curing reaction.
42
Authors: Wen Min He, Shuan Fa Chen, Chuang Wang, Xue Gang Zhang, Rui Xiong
Abstract: Basalt fiber (BF) has a lot of advantageous properties. The actual effectiveness of the fiber depends greatly on their dispersion degree in the composites. With the help of ultrasonic wave and a dispersant carboxymethyl cellulose (CMC), the even dispersion of short basalt fibers in water is realized. The fluidity of the basalt fiber cement mortar becomes less as the fiber content increasing. When the fluidity of mortar of BFRC is greater than 170mm, the even dispersion of short basalt fibers in BFRC can be realized. Fly ash can effectively improve the fluidity of BFRC and the density of cement matrix. When the amount of fly ash replaces the cement less than 25% by weight, it can improve both the compressive strength and tensile strength at age of 28 days.
1869
Authors: Shuan Fa Chen, Si Yue Zhu, Xian Tao Qin, Zu Zhong Li
Abstract: Dynamic viscosity, toughness and tenacity were used as the key indicators combined with conventional asphalt indicators such as ductility, penetration, softening point to evaluate the modification effect. The change laws of the indicators influenced by the dosages of polymer, compatilizer and stabilizer as well as the modification mechanism were analyzed; and the dosages of the three modifiers were determined. The results indicate that the modification effect is strongly influenced by the content of modifiers. Each of the modifiers plays a unique role in the performance the high viscosity asphalt. Through a particular modification technology, the optimum dosages of polymer, compatilizer and stabilizer used in self-modified high viscosity asphalt were determined at 7%, 3% and 2% respectively.
495
Authors: Zeng Ping Zhang, Jian Zhong Pei, Shuan Fa Chen, Yong Wen, Hong Zhao Du
Abstract: A kind of nonfunctional oligomeric silsesquioxane (SSQ), methylsilsesquioxane (Me-SSQ), was used to modify cyanate ester resin (CE) in this paper. First, Me-SSQ was synthesized by the hydrolysis and condensation of methyltriethoxysilane. Then a series of Me-SSQ/CE hybrids containing 0wt%, 1wt%, 5wt%, 10wt% and 20wt% of Me-SSQ were prepared. Curing reactivity of the hybrid materials was studied by differential scanning calorimetry (DSC). Mechanical properties of the Me-SSQ/CE hybrids were studied systematically. Impact strength of the Me-SSQ/CE hybrids reaches its maximum value when Me-SSQ content is 5wt%. However, the flexural strength reaches the maximum value when Me-SSQ content is 1wt%. SEM images accord well with the mechanical properties. It is concluded that appropriate amount of Me-SSQ is favorable to improve the mechanical properties of Me-SSQ/CE hybrid materials.
280
Authors: Zeng Ping Zhang, Yong Wen, Jian Zhong Pei, Shuan Fa Chen
Abstract: Montmorillonite (MMT) modified asphalts are prepared by melt blending with the help of high-speed shear mixer. The dispersion of MMT layers in the asphalt matrix are characterized by X-ray diffraction (XRD). The effect of different contents of MMT on physical properties of the base asphalt is studied. These properties include penetration, softening point and ductility. The results indicate that MMT/asphalt may form a nanocomposite structure with MMT layers intercalated by the asphalt molecules. MMT can improve the high temperature performance and temperature sensitivity of the base asphalt. And it can slightly reduce the low temperature performances of matrix asphalt. It is found that low temperature performances, high temperature performance and temperature sensitivity of the modified system achieved balance when the content of MMT is 4 wt%.
662
Authors: Zeng Ping Zhang, Guo Zheng Liang, Shuan Fa Chen
Abstract: Polyhedral oligomeric silsesquioxane (POSS) can be used to prepare organic/inorganic hybrid materials. Octaepoxysilsesquioxane (E-POSS) containing eight reactive epoxy groups in a molecule was synthesized through the hydrolysis and condensation reaction of γ-[(2,3)-epoxypropoxy] propyltrimethoxysilicane. In this study, E-POSS was cured with 4,4'-Diaminodiphenylsulfone diamine (DDS) and methylnadic anhydride (MNA) , respectively. The curing reactions for both systems were monitored by Fourier transforms infrared spectroscopy (FT-IR). And the thermal properties of the cured systems were studied by Thermogravimetric analysis (TGA). The disappearance of the epoxy groups showed that either DDS or MNA was able to cure E-POSS into an organic-inorganic hybrid system with excellent thermal stability.
519
Authors: Zeng Ping Zhang, Jian Zhong Pei, Shuan Fa Chen, Hong Zhao Du, Yong Wen
Abstract: A functional POSS monomer (POSS-NH2) was employed to modify cyanate ester (CE) resin. A series of POSS-NH2/CE hybrids containing different content of POSS have been prepared by melt casting and then curing. The curing kinetics and reaction mechanisms of the resin systems were studied by using FT-IR. The experimental results show that both temperature and POSS content may influence the curing reaction of CE. POSS-NH2 mainly displays the catalytic effect at higher temperature (220oC). While the circumstance is more complex at lower temperature (190oC).
274
Showing 1 to 8 of 8 Paper Titles