Solid-State C-13 NMR Studies of Vulcanized Elastomers XVII. Effect of Carbon Black Grade on the Network Structure in Natural Rubber Vulcanizates
Solid-State C-13 NMR Studies of Vulcanized Elastomers XVII. Effect of Carbon Black Grade on the Network Structure in Natural Rubber Vulcanizates
复制标题
硫化弹性体的固态 C-13 NMR 研究 XVII。
DOI：
10.5254/1.3538453
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发表时间：
1997
影响因子：
1.5
通讯作者：
J. Koenig
中科院分区：
文献类型：
--
作者：
Makio Mori;J. Koenig
摘要用固体核磁共振和平衡溶胀法研究了炭黑填充天然橡胶的硫化化学和网络形成。当天然橡胶中炭黑浓度增加时，观察到A1型硫化物的硫等级降低和B1型多硫化物的产量增加。在相同的负载水平下，炭黑的结构性质或等级不影响硫化物形成的类型。未填充硫化胶在整个硫化范围内的分子间交联效率为45.7%。化学硫化反应的程度（NMR结果）是恒定的黑色掺入，而总网络（溶胀结果）的黑色负载的增加而增加。物理缠结的量，估计从NMR和溶胀结果的比较，被发现与炭黑浓度线性增加。恩塔...
Abstract The vulcanization chemistry and network formation of carbon black filled natural rubber vulcanized with sulfur and TBBS were studied using solid-state C-13 NMR and equilibrium swelling measurements. A reduction in the sulfur rank of the A1 type sulfide and increased production of B1 type polysulfide are observed when the carbon black concentration increases in natural rubber. At the same loading level, the structural property or grade of carbon black does not affect qualitatively the type of sulfide formation. The efficiency of the intermolecular crosslinking over the whole range of sulfurizations is 45.7% for the unfilled vulcanizate. The extent of the chemical sulfurization reactions (NMR result) is constant with black incorporation, while the total network (swelling result) increases with increases in the black loading. The amount of physical entanglements, estimated from the comparison of the NMR and swelling results, is found to increase linearly with the carbon black concentration. The enta...