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首页> 外文会议>Fall Technical Meeting of the Rubber Division, American Chemical Society >Tearing of Black-filled Natural Rubber and Synthetic Polyisoprene Rubber Vulcanizates
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Tearing of Black-filled Natural Rubber and Synthetic Polyisoprene Rubber Vulcanizates

机译：撕裂黑色天然橡胶和合成聚异戊二烯橡胶硫化橡胶

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摘要

Natural rubber (NR) has outstanding tack and strength in the unvulcanized state and high tensile and tear strength when vulcanized1. These features are attributed to its ability to crystallize rapidly on straining. Synthetic Polyisoprene rubber (IR), synthesized employing a stereospecific catalyst, although close to natural rubber in chemical composition, has reported to be inferior in strength2 compared to NR. This occurs because IR crystallizes more slowly than NR. Edge-cut tensile specimens of gum natural rubber vulcanizates show an abrupt drop in strength at a critical cut size and normal (no cut) tensile specimens show a sharp decrease in strength at a critical temperature . These two effects are due to bulk strain crystallization at small cut sizes or low temperatures, but the lack thereof at large cut depth or high temperature. The addition of carbon black affects tearing; this depends on the type and concentration of black. In this paper, the tearing behavior of IR with various amount of N660 carbon black was investigated, and the results are compared to those obtained with natural rubber. The addition of low concentrations of carbon black decrease crystallization and cut resistance. When carbon black content increases, anisotropy in strength increases, while critical cut decreases. There is a critical level of black needed for reinforcement of IR; this level is higher than that needed for natural rubber. When containing the same amount of black, NR compounds have at least the tear strength of the corresponding IR compounds, and in some cases the NR compounds are much stronger.
机译：天然橡胶（NR）具有在未硫化状态优秀的粘着性和强度和高拉伸和撕裂强度时vulcanized1。这些特性归功于其对应变迅速结晶的能力。合成聚异戊二烯橡胶（IR），合成采用立体有择催化剂，虽然接近化学组合物的天然橡胶，已报道在强度2劣相比NR。这是因为IR结晶比NR慢。胶天然橡胶硫化产品的边缘切割拉伸试样显示在关键切截尺寸和正常（无切口）的强度的突然下降拉伸试样示出了在一个临界温度的强度的急剧下降。这两种效果是由于在小截尺寸或低温散装应变结晶，但在大的切割深度或高温它们缺乏。添加炭黑的影响撕裂;这取决于类型和黑色浓度。在本文中，IR与各种量N660炭黑的撕裂行为进行了研究，并将结果进行比较，以与天然橡胶获得的那些。在加入低浓度的炭黑降低结晶和耐切割性的。当炭黑的含量的增加，各向异性强度增加，而临界剪切减小。有需要的IR加固黑色的临界水平;这个水平比所需的天然橡胶更高。含的黑色相同量时，NR化合物具有至少对应的IR化合物的撕裂强度，并且在一些情况下，NR化合物强得多。

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