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Properties of carboxylated acrylonitrile/butadiene rub-ber containing 'in situ' synthesized silica fillers

机译:含“原位”合成二氧化硅填料的羧化丙烯腈/丁二烯橡胶的性能

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From silica precursors we synthesized silica fillers in sol-gel reaction in the carboxylated acrylonitrile/butadiene rubber (XNBR). N-2-ami-reaction in the carboxylated acrylonitrile/butadiene rubber (XNBR). N-2-ami-noethyl-3-aminopropyl-trimethoxysilane (DAMS) and tetraethoxysilane (TEOS) were used as fillers' precursors. It has been found that DAMS is a substance crosslinking XNBR. The network oints are silsesquioxanes' domains contanining amide as well s ionic bonds. Some part of points (approx 30%) decompose under ethylenediamine treatment. The bigger DAMS content the bigger crosslinking density of elastomer as well as the stress at suitable elongation and tensile strength (Tables 2 and 4). The dynamic properties measurements show that organosilica compounds do not influence glass transition temperature of elastomer (Table 6) but in the range of 30-40 deg C the second maximum appears which is a transition connected to ionic aggregates activity. Addition of a mixture of DAMS+TEOS to the elastomer causes the increase of crosslinking of silsesquioxanes' domains and the filler shows tendency to creation of its own structure (Fig. 2). ~29Si NMR results show that mostly trifunctional structures Q~3 are obtained for equal ratio of silanes (1:1) but tetrafunctional structures Q~4 are also present (Table 1). The increasing of tetrafunctional structure Q~4 content, that is a synthesis of a filler with DAMS+TEOS mixture, leads to the increase of stress at suitable elongation, and tensile strength (Table 5).
机译:由二氧化硅前体,我们在羧化丙烯腈/丁二烯橡胶(XNBR)中通过溶胶-凝胶反应合成了二氧化硅填料。羧基化丙烯腈/丁二烯橡胶(XNBR)中的N-2-酰胺反应。 N-2-氨基-乙基乙基-3-氨基丙基-三甲氧基硅烷(DAMS)和四乙氧基硅烷(TEOS)被用作填料的前体。已经发现DAMS是交联XNBR的物质。网络软膏是倍半硅氧烷的结构域,包含酰胺以及离子键。乙二胺处理会分解一部分点(约30%)。 DAMS含量越大,弹性体的交联密度越大,在合适的伸长率和拉伸强度下的应力也越大(表2和4)。动态性能测量表明,有机硅化合物不影响弹性体的玻璃化转变温度(表6),但在30-40摄氏度范围内,出现第二个最大值,该最大值与离子聚集体的活性有关。在弹性体中添加DAMS + TEOS混合物会导致倍半硅氧烷域的交联增加,而填料则倾向于形成其自身的结构(图2)。 〜29Si NMR结果表明,对于相同比例的硅烷(1:1),可获得大部分三官能结构Q〜3,但也存在四官能结构Q〜4(表1)。四官能结构Q〜4含量的增加,即用DAMS + TEOS混合物填充的合成物,导致在适当的伸长率下的应力和拉伸强度的增加(表5)。

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