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Ozone and Its Reactions with Diene Rubbers

机译：臭氧及其与二烯橡胶的反应

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The reactions of ozone with 1,4-cis-polybutadiene (SKD); Diene 35 NFA (having the following linking of the butadiene units in the rubber macromolecules: 1,4-cis (47%), 1,4-trans (42%), 1,2- (11%); 1,4-m-polyisoprene (Carom IR 2200), 1,4-trans-polychloroprene (Denka M 40), and 1,4-trans-polyisoprene have been investigated in CCl4 solutions. The changes of the viscosity of the polymer solutions during the ozonolysis have been characterized by the number of chain scissions per molecule of reacted ozone (φ). The influence of the conditions of mass-transfer of the reagents in a bubble reactor on the respective φ values has been discussed. The basic functional groups-products from the rubbers ozonolysis have been identified and quantitatively characterized by means of IR-spectroscopy and ~1H-NMR spectroscopy. A reaction mechanism, that explains the formation of all identified functional groups, has been proposed. It has been shown that the basic route of the reaction of ozone with elastomer double bonds - the formation of normal ozonides does not lead directly to a decrease in the molecular mass of the elastomer macromolecules, because the respective 1,2,4-trioxolanes are relatively stable at ambient temperature. The most favourable conditions for ozone degradation emerge when the cage interaction between Criegee intermediates and respective carbonyl groups does not proceed. The amounts of measured different carbonyl groups have been used as an alternative way for evaluation of the intensity and efficiency of the ozone degradation. The thermal decomposition of partially ozonized diene rubbers has been investigated by DSC. The respective values of the enthalpy, the activation energy and the reaction order of the 1,2,4-trioxolanes have been determined.
机译：臭氧与1,4-顺式聚丁二烯（SKD）的反应;二烯35 NFA（在橡胶大分子中具有丁二烯单元的以下连接：1,4-顺式（47％），1,4-反式（42％），1,2-（11％）; 1,4-在CCl4溶液中研究了间聚异戊二烯（Carom IR 2200），1,4-反式聚氯丁二烯（Denka M 40）和1,4-反式聚异戊二烯，在臭氧分解过程中聚合物溶液的粘度变化用每个反应的臭氧分子的链断裂数（φ）来表征，讨论了气泡反应器中试剂传质条件对各个φ值的影响。通过红外光谱和〜1H-NMR光谱对橡胶的臭氧分解进行了鉴定和定量表征，提出了解释所有已识别官能团形成的反应机理，并表明了反应的基本途径带有弹性体双键的臭氧-正常的臭氧化物不会形成导致直接降低弹性体大分子的分子量，因为相应的1,2,4-三氧戊环在环境温度下相对稳定。当Criegee中间体与各个羰基之间的笼子相互作用不进行时，就会出现最有利的臭氧降解条件。已测量的不同羰基的量已用作评估臭氧降解强度和效率的替代方法。通过DSC已经研究了部分臭氧化的二烯橡胶的热分解。已经确定了1,2,4-三氧戊环的焓，活化能和反应顺序的各个值。

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