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Author

Zeng Xiaoyan

Bio: Zeng Xiaoyan is an academic researcher from Chongqing University of Technology. The author has contributed to research in topics: Catalysis & Glass fiber. The author has an hindex of 1, co-authored 5 publications receiving 6 citations.

Papers
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Patent
09 Aug 2019
TL;DR: A plate-type alpha-diimine catalyst and a preparing method and application thereof are described in this paper, where the structural general formula of the catalyst is shown in the description, wherein M is a central metal atom, R1 and R2 are methyl groups, helium atoms or bromine atoms, and R is a fat group or an aromatic group.
Abstract: The invention provides a plate-type alpha-diimine catalyst and a preparing method and application thereof. The structural general formula of the catalyst is shown in the description, wherein M is a central metal atom, R1 and R2 are methyl groups, helium atoms or bromine atoms, a bridging group is phenyl, benzoquinone, cyclopentyl, cyclohexyl, cycloheptyl, cyclooctyl, thiophane, tetrahydrofuran ornafoxidine, and R is a fat group or an aromatic group. The catalyst has high catalysis activity, and can conduct catalysis to obtain a functionalized polyolefin material which has a high molecular weight, a low branching degree, a high polar group content and the highly-controllable structure and performance in products. According to the plate-type alpha-diimine catalyst and the preparing method and application thereof, the cost of raw preparation materials is low, the synthesis route is short, the reaction yield is high, and industrial production is easy to achieve.

1 citations

Patent
30 Jul 2019
TL;DR: In this paper, a foam core phase change sandwich structure composite material and a preparation method thereof are presented. But the composite material comprises an upper/lower surface layer, a foam interlayer, a core layer and reinforcing ribs.
Abstract: The invention provides a foam core phase change sandwich structure composite material and a preparation method thereof. The composite material comprises an upper/lower surface layer, a foam core layerand reinforcing ribs; the upper/lower surface layer and the reinforcing ribs are made from glass fiber reinforced polyurethane composite materials; the foam core layer is made from polyurethane hardness and micro-capsule carried phase change energy storage materials; the upper/lower surface layer, the foam core layer and the reinforcing ribs are subjected to hot-pressing molding to obtain the sandwich composite material, curing and foaming are completed under the same technological condition, the interlayer shear strength of the surface layer and the core layer is improved, and the problem ofinterlayer cracking is avoided. The reinforcing rib structure is introduced into the foam core layer, the whole mechanical strength and rigidity of the sandwich composite material are improved, the impact resistance is greatly enhanced, particularly, the strength of the foam interlayer and the modulus ratio surface layer strength are high, the brittleness and other problems are avoided, the temperature regulating and control functions are achieved, the material functionality is effectively improved on the basis of the light and high strength performance, and light weight and functions of thematerial are achieved.
Patent
09 Aug 2019
TL;DR: A plate-type binuclear alpha-diimine catalyst and a preparing method and application thereof are described in this article, where the structural general formula of the catalyst is shown in the description, wherein M is a central metal atom, R1 and R2 are methyl, helium atoms or bromine atoms, and R is a fat group or an aromatic group.
Abstract: The invention provides a plate-type binuclear alpha-diimine catalyst and a preparing method and application thereof. The structural general formula of the catalyst is shown in the description, whereinM is a central metal atom, R1 and R2 are methyl, helium atoms or bromine atoms, a bridging group is phenyl, benzoquinone, cyclopentyl, cyclohexyl, cycloheptyl, cyclooctyl, thiophane, tetrahydrofuranor nafoxidine, and R is a fat group or an aromatic group. The catalyst is a rigid annular framework, has high catalysis activity and thermal stability, can keep high catalysis activity when catalyzingolefin polymerization at a high polymerization temperature, and can conduct catalysis to obtain a functionalized polyolefin material which has a high molecular weight, high polar group content, and ahighly-controllable structure and performance. According to the plate-type binuclear alpha-diimine catalyst and the preparing method and application thereof, the cost of raw preparation materials islow, the synthesis route is short, the reaction yield is high, and industrial production is easy to achieve.

Cited by
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Journal ArticleDOI
TL;DR: In this article , a review demonstrates the suitable synthesis approaches of PU-PCM that are applicable for perishable food cold storage temperature range (specifically for −10 °C to 15 °C).
Abstract: Usage of thermo-regulative phase change material (PCM) doped polyurethane (PU) foam (PU-PCM) as a building component in cold storage can promote electricity saving in terms of cooling load reduction through utilizing its mutual advantage of insulation as well as thermal energy storage property of PU & PCM respectively. The current review demonstrates the suitable synthesis approaches of PU-PCM that are applicable for perishable food cold storage temperature range (specifically for −10 °C to 15 °C), optimization of PU-PCM's component in production step, performance evaluation approaches, future research scope. Synthesis of PU-PCM composite by direct method suffers from lower thermal cycling ability, and leakage problem of molten PCM; hence the indirect way of PU-PCM synthesis, i.e., encapsulated -PCM (EPCM) incorporating into PU matrix will be the better option to counteract the deficiency of direct method. Organic-inorganic hybrid shell-based EPCM with the paraffinic core of phase transition range −10 °C to 15 °C would be suitable for this purpose due to their better thermal reliability and good adhesion to the PU matrix & better balancing of thermal conductivity. Encapsulation methods of PCM core, size of EPCM, EPCM contents in PU matrix directly influence the properties of PU-PCM and the energy performance of cold storage.

26 citations

Journal ArticleDOI
TL;DR: In this paper , a 3D Kevlar/polyimide composite (K/PIC) was constructed by mimicking the structural features of the beetle's elytra, which has a void content of 84% and a low volume density of 0.23 g/cm3.
Abstract: Lightweight, high strength, and flame-retardant properties are highly required for practical applications of composites, such as in areas of aerospace, aircraft, and automobiles. However, it is challenging to achieve the above properties simultaneously due to the intrinsic conflict between lightweight and excellent mechanical performance. Herein, we overcome this conflict in a 3D Kevlar/polyimide composite (K/PIC) innovatively by mimicking the structural features of the beetle's elytra. As a result, the K/PIC has a void content of 84% and a low volume density of 0.23 g/cm3, but it can support more than 16 000 times its own weight without any damage. It exhibits a specific strength of 23.5 MPa/g·cm−3, which is superior to that of many other reported lightweight composites. Additionally, the as-prepared K/PIC could not be ignited and could retain around 93.2% of its original compressive strength even after being subjected to the flame of an alcohol burner for 300 s. The results demonstrate that similar lightweight, high strength, and flame-retardant composites can be fabricated by this underlying principle in future and be applied in extreme environments, such as aeronautics and aerospace.

12 citations

Journal ArticleDOI
TL;DR: In this article, a 3D Kevlar/polyimide composite (K/PIC) was constructed by mimicking the structural features of the beetle's elytra.
Abstract: Lightweight, high strength, and flame-retardant properties are highly required for practical applications of composites, such as in areas of aerospace, aircraft, and automobiles. However, it is challenging to achieve the above properties simultaneously due to the intrinsic conflict between lightweight and excellent mechanical performance. Herein, we overcome this conflict in a 3D Kevlar/polyimide composite (K/PIC) innovatively by mimicking the structural features of the beetle's elytra. As a result, the K/ PIC has a void content of 84% and a low volume density of 0.23 g/cm3, but it can support more than 16 000 times its own weight without any damage. It exhibits a specific strength of 23.5 MPa/g·cm−3, which is superior to that of many other reported lightweight composites. Additionally, the as-prepared K/PIC could not be ignited and could retain around 93.2% of its original compressive strength even after being subjected to the flame of an alcohol burner for 300 s. The results demonstrate that similar lightweight, high strength, and flame-retardant composites can be fabricated by this underlying principle in future and be applied in extreme environments, such as aeronautics and aerospace.

12 citations

Journal ArticleDOI
TL;DR: In this paper, the phase change temperature, enthalpy, specific heat (Cp), thermal decomposition temperatures and thermal reliability of high-chain diesters were investigated for thermal energy storage applications.

12 citations

Journal ArticleDOI
TL;DR: In this paper , the phase transition property and crystallization capacity of polyurethane-based solid-solid phase change material (PU-SSPCM) were investigated by using organic montmorillonite as a crosslinking heterogeneous nucleating agent.

9 citations