Poly-3-myrcene

PMYRC-x [1,44,45] poly(myrcene) with x% 3,4 [myrcene = 1,6-octadiene-7-methyl-3-methylene]... 

Myrcene is an interesting diene (actually triene) monomer since it has an isolated double bond in its alkyl side chain. Thus, this monomer provides a unique opportunity to study the effects of internal ir-bond interactions in living anionic polymerizations and also to examine the effects of this functionality on the physical properties of poly(myrcene) and various block copolymers as reported herein. 

Poly(myrcene). The sec-butyl1ithium-initiated polymerization of myrcene in benzene solution at 30°C produces poly(myrcene) with predictable molecular weight and narrow molecular weight distribution (M = 58,000, M = 63,000 W /W = 1.09). The yields of poly-n w w n... 

The infrared spectra of poly(myrcene) prepared in benzene show... 

H-NMR spectra (60MHz) of poly(myrcene) show vinyl proton resonances at 65.1ppm which correspond to the unsaturated side chain protons for all microstructures [-CH = CCCH ) ] superimposed... 

The integrated areas of these two peaks indicated that this polymer contains approximately 1% of the 3,4-structure, assuming the absence of the 1,2-enchainment. Sivola has reported 10.4-14.7% of the 3,4-microstructure for poly(myrcene) prepared in benzene under various conditions. Other H-NMR peaks are observed at 62.4-1.8ppm (-CH2-C= and -CH-C= protons), at l.bppm [=C(CH )2]5 and a very small, broad absorption in the range of ca. 1.3-0.9 ppm (CH - ( ) ... 

Figure 1. Gel permeation Chromatograph of homo-poly(myrcene) poly(myrcene-b-styrene)...

These studies indicate that poly(styrene-b-myrcene-b-styrene) triblock copolymes exhibit interesting and unique properties compared with the analogous SIS and SBS triblock copolymers. It will be interesting to further examine the structure-property relationships for poly(myrcene) and its copolymers. 

Poly [ 1 -(4-methylpentyl)-1 -buty lene-co-1 -(1,5-dimethylhexyl)ethylene ( = hydrogenated poly(myrcene) Poly(2-methylpentene-l-sulfone)... 

In archaeological findings the occurrence of a high abundance of 28-norolean-17-en-3-one has been correlated to smouldering or burning processes undergone by Pistacia resins [94,123,124]. Mastic also contains a polymeric fraction (15 20%) identified as cw-1,4-poly-p-myrcene [128]. 

K.J. van der Berg, J. ven der Horst, J.J. Boon, 0.0. Sudmeijer, Cis 1,4 poly P myrcene the structure of the polymeric fraction of mastic resin (Pistacia lentiscus) elucidated, Tetrahedron... 

A method, using differential scanning calorimetry, has been developed to estimate quantitatively orthorhombic and monoclinic sulfur in sulfur materials. Sulfur cooled from the melt at 120°C immediately gives monoclinic sulfur which reverts to orthorhombic sulfur within 20 hr. Limonene, myrcene, alloocimene, dicyclopentadiene, cyclododeca-1,5,9-triene, cycloocta-1,3-diene, styrene, and the polymeric polysulfides, Thiokol LP-31, -32, and -33 each react with excess sulfur at 140° C to give a mixture of poly sulfides and unreacted sulfur. In some cases substantial amounts of this unreacted sulfur may be held indefinitely in a metastable condition as monoclinic sulfur or S8 liquid. Limonene, myrcene, and dicyclopentadiene are particularly effective in retarding sulfur crystallization. 

The corresponding copolymerization with styrene in benzene yielded a polymer rich in myrcene with a poly(St) block formed in the later polymerization stages. In THF, a styrene-rich copolymer was obtained in the early stages, with a polymyrcene block formed towards the end [91]. 

Figure 3. Dynamic Mechanical Analysis of Poly(styrene-myrcene-styrene), SMS-3...

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