CORAL RUBBER - A CIS-1,4-POLYISOPRENE
CORAL RUBBER - A CIS-1,4-POLYISOPRENE
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DOI：
10.1021/ie50556a032
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发表时间：
1956-01-01
影响因子：
--
通讯作者：
EBERLY, KC
中科院分区：
文献类型：
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作者：
STAVELY, FW;DUNBROOK, RF;EBERLY, KC
本文提供的数据支持这样的论点，即高顺式-1，4-含量的聚异戊二烯橡胶（珊瑚橡胶）已经被开发出来，它在聚合物结构上与橡胶树橡胶惊人地相似，如由红外结构、X-射线结晶图案、过苯甲酸测定的1，4-加成、臭氧分解、不饱和度、碳氢比、分子量分布、特性粘度和比重所指示的。它还表明，这些聚合物的结构特征和珊瑚橡胶的其他特性提供的证据表明，这些相同的结构特征中发现的天然橡胶占其低滞后，高胶拉伸强度，并在高温下保持良好的物理性能。珊瑚橡胶与橡胶树橡胶的不同之处在于，它具有略少的顺式-1，4-结构和略多的3，4-结构;它不像天然橡胶那样容易吸收氧气，具有更高的热稳定性，并且更耐轮胎胎面开裂。橡胶树橡胶和巴拉塔橡胶（两者都是聚异戊二烯）在聚合物链中具有少量的3，4-结构，而不是如迄今为止普遍接受的那样仅具有1，4-结构。在含有100%珊瑚橡胶的卡车轮胎中，与天然橡胶轮胎完全相同。具有Coral胎体的卡车轮胎在正常商业服务中表现令人满意。卡车和乘客轮胎的胎面磨损道路测试表明，珊瑚橡胶胎面含有与橡胶胎面相似数量和类型的炭黑，其磨损率为橡胶胎面的95%。
The data presented here support the contention that a polyisoprene rubber of highcis-1,4-content (Coral rubber) has been developed, which is strikingly similar in polymer structure to Hevea rubber, as indicated by infrared structure, x-ray crystalline pattern, perbenzoic acid determination of 1,4-addition, ozonolysis, unsaturation, carbon-hydrogen ratio, molecular-weight distribution, inherent viscosity, and specific gravity. It is also shown that those polymer structural features and other characteristics of Coral rubber provide evidence that these same structural features found in natural rubber account for its low hysteresis, high gum tensile strength, and good retention of physical properties at elevated temperatures. Coral rubber differs from Hevea rubber in that is has slightly lesscis-1,4-structure and slightly more 3,4-structure; it does not absorb oxygen as readily as natural rubber, has higher thermal stability, and is more resistant to cracking in tire treads. Both Hevea rubber and balata (both being polyisoprenes) have small amounts of 3,4-structure in the polymer chain rather than exclusively 1,4-structure as heretofore generally accepted. In truck tires containing 100 per cent Coral rubber, the heat build-up during service (50 m.p.h.) was identical to tires built from natural rubber. Truck tires having Coral body stocks gave satisfactory performance in normal commercial service. Tread wear road tests on truck and passenger tires show that Coral rubber treads, containing similar amounts and type of carbon black as Hevea treads, give 95 per cent of the wear obtained with Hevea treads.