Poly(beta-methyl-delta-valerolactone) block polymers
Block copolymers include a poly β-methyl-δ-valerolactone (PMVL) block. The PMVL blocks can be formed from biosynthesized β-methyl-δ-valerolactone (MVL). The PMVL block may be formed from biosynthesized β-methyl-δ-valerolactone (MVL) with a 14 C/ 12 C ratio greater than zero. The block copolymers can include hard blocks. The block copolymers can be thermoplastic elastomers. The block copolymers may include a polylactic acid (PLA) block.
1. A block copolymer comprising:
a poly((β-methyl-δ-valerolactone) (PMVL) block, wherein the block copolymer has a 14 C/ 12 C ratio greater than zero.
2. A block copolymer according to claim 1 , wherein the PMVL block has a mass average molar mass (M w ) of 0.25 kDa or greater.
3. A block copolymer according to claim 1 , further comprising a second polymer block having a glass transition temperature 10° C. or more greater than the glass transition temperature of the PMVL block.
4. A block copolymer according to claim 3 , wherein the second block has a glass transition temperature of about 30° C. or greater.
5. A block copolymer according to claim 3 , wherein the second block has a glass transition temperature of about 50° C. or greater.
6. A block copolymer according to claim 3 , wherein the second block is a crystalline or semi-crystalline block at about 23° C.
7. A block copolymer according to claim 1 , further comprising a second block formed from a polymer selected from the group consisting of polylactic acid, polyhydroxybutyrate, polybutylene succinate and polyurethane.
8. A block copolymer according to claim 1 , further comprising a second block formed from polylactic acid or polyhydroxybutyrate.
9. A block copolymer according to claim 1 , further comprising a second block formed from polylactic acid.
10. A block copolymer according to claim 1 , further comprising a second block, wherein the PMVL block and the second block each have an M w of about 0.25 kDa or greater.
11. A block copolymer according to claim 1 , wherein the PMVL block has a 14 C/ 12 C ratio greater than zero.
12. A block copolymer according to claim 1 , wherein the block copolymer is an ABA block copolymer, wherein the mid-block is the PMVL block, and wherein the end blocks are formed from a polymer having glass transition temperature 30° C. or more.
13. A method of forming a block copolymer, comprising:
providing a living poly((β-methyl-δ-valerolactone) (PMVL) polymer or a telechelic PMVL block; and
polymerizing one or more monomers from the living PMVL polymer or the telechelic PMVL block,
wherein polymerizing the one or more monomers produces a polymer block having a glass transition temperature 10° C. or more greater than the glass transition temperature of the PMVL block,
wherein the living PMVL polymer or the telechelic PMVL block has a 14 C/ 12 C ratio greater than zero.
14. A method of forming a block copolymer, comprising:
providing a poly((β-methyl-δ-valerolactone) (PMVL) block;
providing a polymer block having a glass transition temperature 10° C. or more greater than the glass transition temperature of the PMVL block; and
coupling the PMVL block to the polymer block having a glass transition temperature 10° C. or more greater than the glass transition temperature of the PMVL block, wherein providing the PMVL block comprises providing a PMVL block having a 14 / 12 C ratio greater than zero.
15. A block copolymer comprising:
a poly((β-methyl-δ-valerolactone) (PMVL) block, further comprising a second block formed from polylactic acid.