Macromers with propylene oxide

This paper examines two types of hydroxypropyl lignin based macromers, and these are illustrated schematically in Figure 1. Macromers with propylene oxide (PO) are formed by reducing the number of available hydroxyl groups on HPL followed by chain extension with PO and macromers with cellulose triacetate (CTA) are synthesized by attaching a monofunctional CTA chain to a limited number of terminal OH groups on HPL via a suitable grafting reaction. 

Macromers with propylene oxide. Hydroxypropyl (organosolv) lignin (HPL) is a low molecular weight (pre)polymer with a number average molecular... 

The engineering of lignin-based macromers with propylene oxide to target specifications appears as a useful technique for formulating components for block copolymers and segmented thermosets. 

We shall continue this study, attempting to Increase the epoxy end group content of the macromer. Capping agents other than ethylene oxide and other terminating agents will be explored. Macromer copolymerizations with propylene oxide or epichlorohydrin will be explored, attempting to prepare polyether type thermoplastic elastomers and hot-melt adhesive. 

One of the older methods to obtain macromers is to add very small quantities of a monomer having a double bond and a polymerisable epoxy group in the same structure to propylene oxide, during the anionic polymerisation. A typical example of such a kind of monomer is allyl glycidyl ether. This monomer copolymerises anionically with PO, giving polyethers with small quantities of lateral double bonds (reaction 6.10). 

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