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首页> 外文期刊>Journal of Applied Polymer Science >THE MOLECULAR BASIS OF FRACTURE IN CROSSLINKED GLASSY POLYMERS
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THE MOLECULAR BASIS OF FRACTURE IN CROSSLINKED GLASSY POLYMERS

机译：交联玻璃态聚合物的断裂分子基础

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Crosslinked polystyrene (XPS) and poly(methyl methacrylate) (XPMMA) were prepared by photopolymerization of the respective monomers in the presence of reversible crosslinkers, acrylic acid anhydride (AAA), and methacrylic acid anhydride (MAA). Fracture studies on the crosslinked samples were carried out using a Dental Burr Grinding Instrument( DBGI). The fracture energy in all cases showed a maximum around 1.5-5.0 mol % crosslinker. The samples were decrosslinked by hydrolysis using dilute aqueous ammonium hydroxide solutions to determine the number of chain scissions as a result of grinding. The number of chain scissions increased asymptotically with crosslink density in the range of a 0.0-10.0 mol % crosslinker. The number of bonds activated per scission, obtained from the calculated total chain scission energy (after subtracting the chain pullout energy) and the experimental number of chain scissions, remained fairly constant for AAA-PS and AAA-PMMA at 312 +/- 150 bonds and 202 +/- 50 bonds, respectively, in the region below the fracture energy maximum. In an attempt to explain the fracture energy increases, increasing physical entanglements with crosslinking is considered. (C) 1997 John Wiley & Sons, Inc. [References: 33]
机译：交联的聚苯乙烯（XPS）和聚甲基丙烯酸甲酯（XPMMA）是通过在可逆交联剂，丙烯酸酐（AAA）和甲基丙烯酸酐（MAA）的存在下对相应的单体进行光聚合来制备的。使用Dental Burr研磨仪（DBGI）对交联样品进行断裂研究。在所有情况下，断裂能均显示出最大约1.5-5.0mol％的交联剂。通过使用稀氢氧化铵水溶液通过水解使样品脱交联，以测定由于研磨而引起的链断裂的数目。随着交联密度在0.0-10.0 mol％的交联剂范围内，链断裂的数目渐近增加。从计算的总断链能量（减去链拔出能量）和实验的链断裂数获得的每断活化的键数对于AAA-PS和AAA-PMMA在312 +/- 150键处保持相当恒定在断裂能最大值以下的区域分别为202和50 +/- 50键。为了解释断裂能的增加，考虑了与交联的物理缠结的增加。 （C）1997 John Wiley＆Sons，Inc. [参考：33]

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