Analysis Of Polyisoprenes by Infrared Spectroscopy
Analysis Of Polyisoprenes by Infrared Spectroscopy
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DOI：
10.1021/ac50162a024
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发表时间：
1957-04
影响因子：
7.4
通讯作者：
J. Binder;H. C. Ransaw
中科院分区：
文献类型：
--
作者：
J. Binder;H. C. Ransaw
需要一种准确的方法来确定聚合变量和催化剂对异戊二烯聚合中顺式-1、4、反式1、4、1、2和3、4加成量的影响。通过使用 8.84 和 8.68 微米带的吸光度测量可以获得 c/s-1, 4 和 trans-1, 4 测定的更准确和可重复的结果，并且证实了先前建议的这些带与这些结构的相关性。在许多异戊二烯聚合体系中，形成了额外的结构，并开发了一种考虑吸收的方法。由于这些结构。给出了典型聚异戊二烯的组成。橡胶和橡胶并不完全是顺式-1, 4-和反式-1, 4-聚异戊二烯，而是含有一些异丙烯基结构。可以确定地确定聚合条件和催化剂变化的影响，这有助于合成“天然”橡胶的开发。可以确定这些和其他合成聚异戊二烯与橡胶树的相似性。
An accurate method for determining the effects of polymerization variables and catalysts on the amounts of c/s-1, 4, trans-1, 4, 1, 2, and 3, 4 additions in isoprene polymerizations was desired. More accurate and reproducible re-sults for the c/s-1, 4 and trans-1, 4 determinations could be obtained by using absorbance measurements of bands at 8.84 and 8.68 microns, and the previously suggested correlation of these bandswith thesestructures is con-firmed. In many polymerizing systems for isoprene, additional structures are formed and a method was developed which takes into account the absorption. due to these structures. The compositions of typical polyisoprenes are given. Hevea and balata are not completely c/s-1, 4-and trans-1, 4-poly-isoprenes, but contain some isopropenyl structure. The effects of changes in polymerization conditions and catalysts can be determined with certainty and this has aided in the development of synthetic" natural" rubbers. The simi-larity to Hevea of these and other syn-thetic polyisoprenes can be determined.