## 1 Introduction  
Classic combinations, such as liquid hydrogen/liquid oxygen, liquid oxygen/kerosene, and liquid oxygen/methane, play a crucial role in aerospace launch vehicle fuels [1, 2]. The weight of a rocket and its payload capacity are inversely related, with the rocket's tank structure accounting for more than 50% of the total rocket body weight. Therefore, reducing the weight of the fuel tank structure is pivotal in enhancing a rocket's payload capacity [3, 4]. Currently, liquid oxygen storage tank composites primarily employ epoxy resin and cyanate ester-based matrix resins. These two resin systems exhibit excellent compatibility with liquid oxygen [5, 6]. Epoxy resins boost exceptional processing and mechanical properties, but they are susceptible to high water absorption, and inaccuracies in formulation measurement can adversely affect material processing, molding, and property stability [7, 8, 9]. In contrast, cyanate ester resins offer outstanding thermal and mechanical properties, due to the highly cross-linked and symmetrical triazine ring structure resulting from the cyclotrimeration of three cyanate groups [10, 11]. Compared to other thermosetting resins, cyanate esters combine the processability of epoxy resins with the thermal stability of bismaleimide and the heat resistance and flame retardancy of phenolic resins. Consequently, they find widespread use in aerospace, electronic packaging, ablative, and radiation-resistant materials [10; 12; 13]. However, the high spatial specificity required for cross-linking via cyclotrimization means the thermally initiated curing reaction of cyanate ester resins typically require high temperatures above 523 K [14; 15]. The high curing temperature is one of the disadvantages of cyanate ester resins, as it generates residual thermal stresses in the product and affects its mechanical properties. Therefore, lowering the curing temperature has become one of the main research directions for the development of cyanate ester and its blended resins [16; 17]. In addition, the ether-bonded structure of cyanate ester resins provides a certain degree of flexibility in their cured products, showing a toughness comparable to that of epoxy resins, but because of the high cross-linking density of the cyanate ester resins themselves, the cured products are more brittle when they are used alone, and they need to be modified and toughened. Thermosetting resins usually need to be fully cured at high temperatures to have excellent mechanical properties and high temperature resistance. To reduce energy consumption and ensure the mechanical properties of the resin casting body, catalysts can be added to reduce the curing reaction temperature of thermosetting resins, reduce the time, save on costs, and improve the mechanical properties of the resin [18; 19]. Water, phenol, transition metal complexes, and active hydrogen compounds have been used in the catalytic curing of cyanate esters to reduce their cure temperature [20; 21; 22; 23]. However, there have been some problems during the curing reaction of cyanate ester blend resins, such as incomplete curing at low temperatures and possible residual free isocyanates in the cured products [24]. These problems need to be solved by optimizing the reaction conditions and adding the appropriate additives, etc., to achieve the controlled preparation and application of cyanate ester blend resins. Bisphenol A dipropargyl ether has excellent thermal stability and physical/mechanical properties and its low water absorption makes it suitable for industrial mass production for the preparation of polymeric materials. Alkynyl ethers are very attractive alkyne groups which are easy to prepare, and thermosetting resins with terminal alkyne groups have good processability, low water absorption, excellent thermal stability, and excellent physical/mechanical properties [16; 25; 26]. [PERSON] et al.