Córdova Teresa, Enriquez-Medrano Francisco Javier, Magaña Ilse, García-Zamora Maricela, Jimenéz-Reyes Nelson A, Mata-Padilla José M, Cabrera-Álvarez Edgar E, Valencia Luis, Díaz de León Ramón
Research Center for Applied Chemistry Blvd Enrique Reyna 140 Saltillo 25294 Mexico
CONAHCYT, Research Center for Applied Chemistry Unidad Monterrey, Av. Alianza Sur 204 Apodaca Nuevo León C.P. 66629 Mexico.
RSC Adv. 2025 Jan 9;15(2):732-738. doi: 10.1039/d4ra07481e.
The development of materials from renewable resources has been increasing, intending to reduce the consumption of fossil sources, with terpenes being one of the main families that reduce the consumption of isoprene. The study of the binary catalytic system neodymium versatate/dibutyl magnesium (NdV/Mg(-Bu)), for the coordination homopolymerization of β-myrcene and β-farnesene, was carried out analysing different [Nd] : [Mg] ratios (between 4 and 10). Reporting conversions of 92% and 83% at an [Nd] : [Mg] ratio of 8 for polymyrcene (PMy) and polyfarnesene (PFa), respectively, and microstructures comprising 1,4 content above 80% for both polymers (PMy, -59% and PFa, -83%). It was observed that PFa samples presented a higher 1,4- content in relation to PMy samples, presumably due to the size of the side group present in the monomer structure and due to steric hindrance; similarly, a 3,4 content of 14% (PMy) and 10% (PFa) was observed. The glass transition temperature of the PMy samples ranged from -63.7 °C to -66.5 °C, while for the PFa samples, it was between -75.4 °C and -75.5 °C. The binary [Nd] : [Mg] system used in the study predominantly exhibited a 1,4- content at [Nd] : [Mg] ratios of 8.
来自可再生资源的材料开发一直在增加，旨在减少化石资源的消耗，萜烯是减少异戊二烯消耗的主要家族之一。开展了对新癸酸钕/二丁基镁（NdV/Mg(-Bu)）二元催化体系用于β-月桂烯和β-法尼烯的配位均聚反应的研究，分析了不同的[Nd] : [Mg]比例（4至10之间）。结果表明，在[Nd] : [Mg]比例为8时，聚月桂烯（PMy）和聚法尼烯（PFa）的转化率分别为92%和83%，两种聚合物（PMy为-59%，PFa为-83%）的微观结构中1,4含量均高于80%。观察到PFa样品相对于PMy样品呈现出更高的1,4-含量，这可能是由于单体结构中侧基的大小以及空间位阻；同样，观察到3,4含量分别为14%（PMy）和10%（PFa）。PMy样品的玻璃化转变温度范围为-63.7℃至-66.5℃，而PFa样品的玻璃化转变温度在-75.4℃至-75.5℃之间。该研究中使用的二元[Nd] : [Mg]体系在[Nd] : [Mg]比例为8时主要呈现出1,4-含量。
