Materials Research and Development is an international, peer-reviewed open access journal dedicated to advancing research the field of materials science and engineering. The journal provides a rapid publication process to ensure wide dissemination of high-quality articles to scientists, professionals, and interested individuals worldwide. Our goal is to serve as an efficient, reliable, and trusted platform for scholars and readers, publishing cutting-edge research in the field.
Abstract: As an important inorganic functional material, nano-calcium carbonate (nano CaCO3) was proposed in the 1980s and has been widely used in rubber, plastics, medicine, and paper industries because of its high specific surface area, good biocompatibility, and non-toxicity. In recent years, with the rapid development of the demand for nano-calcium carbonate, the research of nano-calcium carbonate at home and abroad has been deepening, and the related nano-calcium carbonate industry has developed quickly. Recently, many groups reported new preparation technologies, such as the physical, carbonization, compound decomposition, and emulsion methods. Among these proposed methods, the intermittent bubbling carbonization method is considered the most widely used classical process in the world. In the modification of nano CaCO3, the activation mechanism of coupling agents, surfactants, inorganic substances, polymer modifiers, and the modification effects of different modifiers are introduced. In this paper, the new application progress of nano CaCO3 in papermaking, daily chemical products, biomedicine, plastics, and construction materials is reviewed. In particular, nano CaCO3 has excellent biocompatibility and low cytotoxicity, which greatly improves the mechanical properties of polymer composites. Finally, the problems to be further solved in the future development of nano CaCO3 are analyzed and prospected, especially in preparing the high whiteness of nano-calcium carbonate from natural limestone with high iron content (>0.08%).Abstract: As an important inorganic functional material, nano-calcium carbonate (nano CaCO3) was proposed in the 1980s and has been widely used in rubber, plastics, medicine, and paper industries because of its high specific surface area, good biocompatibility, and non-toxicity. In recent years, with the rapid development of the demand for nano-calcium carbo...Learn More
Abstract: The study on the preparation of a styrene-free unsaturated polyester using diallyl phthalate as a cross-linking agent, and the cross-linking reaction conditions for the preparation of unsaturated polyester through cross-linking and curing reaction of this cross-linking agent were studied. In this paper, the effects of the amount of initiator, curing temperature and curing time on the properties of unsaturated polyesters under two initiator systems, benzoyl peroxide (BPO) and tert-butyl peroxybenzoate (TBPB), were studied. Through research, it is found that under the two initiator systems, appropriately increasing the amount of initiator, increasing the curing temperature and prolonging the curing time are all beneficial to improve the tensile strength, flexural strength and thermal deformation temperature of unsaturated polyester, but unsaturated polyester The toughness of the ester is also deteriorated and the impact resistance is reduced. When the amount of initiator, curing temperature and curing time exceed a certain value, the change trend of these properties becomes slower. The initiation temperature required for the BPO initiated system is slightly lower than that of the TBPB initiated system. This study focuses on the preparation of a styrene-free unsaturated polyester using diallyl phthalate (DAP) as a cross-linking agent and systematically investigates the cross-linking reaction conditions. The effects of initiator type (benzoyl peroxide, BPO, and tert-butyl peroxybenzoate, TBPB), initiator content (1%–5%), curing temperature (100–140°C), and curing time (2–6 h) on the mechanical and thermal properties of the unsaturated polyester were evaluated. Experimental results indicate that increasing initiator content, curing temperature, and curing time within optimal ranges significantly enhances tensile strength, flexural strength, and heat deflection temperature (HDT).Abstract: The study on the preparation of a styrene-free unsaturated polyester using diallyl phthalate as a cross-linking agent, and the cross-linking reaction conditions for the preparation of unsaturated polyester through cross-linking and curing reaction of this cross-linking agent were studied. In this paper, the effects of the amount of initiator, curin...Learn More
