Anionic Homo-/Co-polymerization Of Myrcene

The development of bio-based polymers can effectively alleviate the current serious energy crisis and environmental problems.As a bio-based terpene compound,The polymerization of myrcene have a great significance for the development of biomolecular materials.In this paper,the anion polymerization of myrcene was studied with lithium alkyl as initiator and cyclohexane as solvent.The main contents and conclusions are as follows:Fristly,the homopolymerization of myrcene was studied in this paper.The kinetic study of myrcene showed that the reaction order of polymerization rate to the monomer concentration is first order,the molecular weight increased linearly with the conversion rate with the molecular weight distribution was narrow,polymercene can induce styrene/diene monomers to prepare block copolymers,that' all showing the characteristics of living polymerization.The microstructure of polymyrcene can be controlled by changing the temperature,regulator proportion and concentration DSC test show that with the increase of 3,4-My structure(7.52%-47.91%),the glass transition temperature increased(-64.30?--52.89?).Secondly,the copolymerization behavior of myrcene with styrene and myrcene with isoprene was studied.It was shown that myrcene and styrene as well as myrcene and isoprene could initiate each other,block copolymers and random copolymers between My and St and My and Ip could be prepared.Under the condition of high conversion rate,the competitive rate in My-St binary system was analysed,the results show that in 50?,cyclohexane solution,no regulator the competition ratio of styrene less than myrcene,When[ETE]/[s-BuLi]was 0.8,the competition ratio of styrene better than myrcene,At the same time,rl(St)=1.56,r2(My)=0.69 were measured in 50? cyclohexane solution under low conversion rate,indicating that the effect of the regulator on styrene activity was significantly greater than that of myrcene.Temperature,regulator proportion and concentration have significant effects on the of styrene(50wt%)in My-St binary copolymer:The effect of the above factors on the structural content of 3,4-My in the copolymer is similar to that of homopolymerization.The microstructure of St-Ip/My-Bd copolymerization with high styrene content(40wt%)was studied.In the absence of regulator,the Ip/My content increased from 0 to 20%,the styrene random degree increased from 48%to 60%and the content of 1,2-Bd increased slightly.When a small amount of THF([THF]/[BuLi]=0.5)is added,the content of Ip/My increases from 0 to 30%,the random degree of styrene increases to 100%,and the content of 1,2-Bd increases to 27.6%-31.3%.SIBR with high styrene content and low vinyl content can be prepared by introduce monomer of Ip/My in the process of copolymerization.