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Determination of four acrylates in food packaging paper via high performance liquid chromatography
Published in Binoy K. Saikia, Advances in Applied Chemistry and Industrial Catalysis, 2022
Yue Qiu, Dong Xiang, Lu Zhang, Jiaxiong Zhao
The acrylate polymer has excellent color preservation, light resistance, UV resistance, difficult to oxidation and other advantages (Sengtu 2008; Wei 2009; Zhao 2009). The modified acrylate polymer through functional unit has good paper enhancement effect and water proof performance, therefore it is widely used in the papermaking industry. Acrylate monomer substances have irritant and sensitization to skin, eyes and respiratory tract, which may cause lung, liver and kidney damage. It has been reported that long-term exposure to methyl methacrylate in human body can lead to chronic poisoning, which mainly manifested as comprehensive symptoms of nervous system damage, toxic encephalopathy and even teratogenesis may occur in a few cases (Gong 2013; Liu 2011; Qiu 2021). During the use of food contact materials, harmful substances will migrate into the human body through food.
Self-Cleaning Textiles Based on Superhydrophobic Nanocoatings
Published in Mangala Joshi, Nanotechnology in Textiles, 2020
In view of their film-forming ability and adaptability, polymers are increasingly used for fabricating superhydrophobic surfaces. Phase separation of the multicomponent blend can be used to form polymer-based rough surfaces [87]. Zhang et al. depicted a basic and conservative technique for getting a superhydrophobic surface on wool with a brush-like polymer through the migration of organic siloxane segments in the acrylate side chains to the outer layer. Initially, the increase in film-forming properties and cohesiveness could be contributed by acrylate polymer chains. Finally, low surface free energy characterized by long Si–O–Si chains could be employed to improve water repellency [88].
Effect of a novel type of water-in-oil nanocomposite viscosity improver on rheological properties of crude oil
Published in Petroleum Science and Technology, 2023
Huili Zhang, Yucui Zhao, Xuyu Chen, Long Dong, Hailin Yu, Jinjun Deng, Yanbin Tong, Lingmin Wu, Liqun Sun, Hongsheng Liu
At present, more commonly used PPDs for crude oils are essentially polymers with splendid oil solubility, which generally consist of two parts (Chen et al. 2015): polar groups and non-polar groups. The dioleic acid triethanolamine polymer-type PPD synthesized can boost effectively the rheology of crude oil. Among polymeric PPDs, comb polymers are usually homopolymers or copolymers acquired by the polymerization of one or several monomers. Hereby the study of PPDs has aroused widespread interest. Polyacrylate PPDs are typical comb polymer. Admiral, Abdullah, and Ariffin (2016) prepared an emulsified acrylate polymer. It verified that he emulsified acrylate has higher kinetic energy, which can efficiently propagate into wax molecules, thereupon inhibiting the crystal growth of paraffin wax. Next, Ahmed, Khidr, and Ali (2022) adopted styrene and acrylic acid as raw materials to prepare polystyrene-acrylic acid copolymer by the polymerization reaction in order to improve the effectiveness of PPD. Lastly, polystyrene-acrylate was gained by quaternization with dodecyl bromide and cetyl bromide. Besides it does not affect the subsequent processing of crude oil since basic elements of this kind of PPD are mainly carbon, hydrogen and oxygen. Correspondingly, it is widely applied in the field of crude oil pipeline transportation.
Synthesis and self-cleaning properties of superamphiphobic coatings based on burr-like copolymer particles
Published in Surface Engineering, 2022
The most classic case of superhydrophobic Cassie–Baxter state in nature is the lotus leaf, which is composed of micro-scale papilla and nano-scale epicuticular wax crystals [34,35]. The densely arranged burr-like structure of water strider legs can also trap a continuous air phase at the burr root to produce a super non-wetting Cassie–Baxter state [33,36]. Inspired by this structure, we designed a burr-like copolymer nanoparticle and achieved precise control of the burr-like structure by controlling the content of KH-570. The burr-like copolymer KH-PS nanoparticles build the dual-scale roughness for the superamphiphobic surface and then modify the fluorocarbon chain to reduce the surface energy. Silicone-acrylate polymer is introduced to improve the adhesion between the coating and substrate; however, it would reduce the hydrophobicity and oleophobicity. In order to solve this problem, fluorine-containing monomers are added to the polymer to resist this weakening effect. The experimental results show that appropriate fluoromonomer content can achieve the coexistence of 5B adhesion and superamphiphobicity.
Expansion inhibition of steel slag in asphalt mixture by a surface water isolation structure
Published in Road Materials and Pavement Design, 2020
Lili Ma, Dingbin Xu, Shengyue Wang, Xingyu Gu
Technical indicators of the silicone waterproof agent were displayed as follows: solid content ≥50%, drying time ≤1 h/25°C, setting time: 1.5 h/200°C. The original agent had great consistency and had difficulty in dispersing on steel slag surface. Methylbenzene (original agent: methylbenzene = 1:1) was used to dilute silicon acrylate resin. Then 4% additives composing of penetrant and defoaming agents were added to finally get the silicone waterproof agent. The silicone acrylate resin, the main ingredient in the agent, was silicone resin modified by acrylate. It combined the toughness, cohesiveness and strength of acrylate polymer and the heat resistance, hydrophobicity and sealing of silicone resin. After cured at high temperature, the resin developed highly cross-linked structure to form a dense coating.