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首页> 外文期刊>Journal of Applied Polymer Science >Enhanced fracture toughness of epoxy resins with novel amine-terminated poly(arylene ether sulfone)-carboxylic-terminated butadiene-acrylonitrile-poly(arylene ether sulfone) triblock copolymers
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Enhanced fracture toughness of epoxy resins with novel amine-terminated poly(arylene ether sulfone)-carboxylic-terminated butadiene-acrylonitrile-poly(arylene ether sulfone) triblock copolymers

机译：新型胺封端的聚（亚芳基醚砜）-羧基封端的丁二烯-丙烯腈-聚（亚芳基醚砜）三嵌段共聚物可增强环氧树脂的断裂韧性

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Amine-terminated poly(arylene ether sulfone)-carboxylic-terminated butadiene-acrylonitrile-poly(arylene ether sulfone) (PES-CTBN-PES) triblock copolymers with controlled molecular weights of 15,000 (15K) or 20,000 (20K) g/mol were synthesized from amine-terminated PES oligomer and commercial CTBN rubber (CTBN 1300x13). The copolymers were utilized to modify a diglycidyl ether of bisphenol A epoxy resin by varying the loading from 5 to 40 wt%. The epoxy resins were cured with 4,4'-diaminodiphenylsulfone and subjected to tests for thermal properties, plane strain fracture toughness (K-IC), flexural properties, and solvent resistance measurements. The fracture surfaces were analyzed with SEM to elucidate the toughening mechanism. The properties of copolymer-toughened epoxy resins were compared to those of samples modified by PES/CTBN blends, PES oligomer, or CTBN. The PES-CTBN-PES copolymer (20K) showed a K-IC of 2.33 MPa m(0.5) at 40 wt% loading while maintaining good flexural properties and chemical resistance. However, the epoxy resin modified with a CTBN/8K PES blend (2:1) exhibited lower K-IC (1.82 MPa m(0.5)), lower flexural properties, and poorer thermal properties and solvent resistance compared to the 20K PES-CTBN-PES copolymer-toughened samples. The high fracture toughness with the PES-CTBN-PES copolymer is believed to be due to the ductile fracture of the continuous PES-rich phases, as well as the cavitation of the rubber-rich phases. (C) 2002 Wiley Periodicals, Inc. [References: 28]
机译：胺封端的聚（亚芳基醚砜）-羧酸封端的丁二烯-丙烯腈-聚（亚芳基醚砜）（PES-CTBN-PES）三嵌段共聚物的分子量控制在15,000（15K）或20,000（20K）g / mol。由胺端基PES低聚物和商用CTBN橡胶（CTBN 1300x13）合成。通过改变5至40重量％的负载量，将共聚物用于改性双酚A环氧树脂的二缩水甘油醚。用4,4'-二氨基二苯砜固化环氧树脂，并进行热性能，平面应变断裂韧性（K-IC），弯曲性能和耐溶剂性测试。用SEM分析断裂表面以阐明增韧机理。将共聚物增韧环氧树脂的性能与通过PES / CTBN共混物，PES低聚物或CTBN改性的样品的性能进行了比较。 PES-CTBN-PES共聚物（20K）在40 wt％的载荷下显示出2.33 MPa m（0.5）的K-IC，同时保持了良好的挠曲性能和耐化学性。但是，与20K PES-CTBN相比，用CTBN / 8K PES共混物（2：1）改性的环氧树脂表现出较低的K-IC（1.82 MPa m（0.5）），较低的挠曲性能以及较差的热性能和耐溶剂性-PES共聚物增韧的样品。据信，PES-CTBN-PES共聚物的高断裂韧性是由于连续富PES相的延性断裂，以及富橡胶相的空化。 （C）2002 Wiley Periodicals，Inc. [参考：28]

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