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US 2008/0177303 A1Published application
Shape memory polymers
AssigneeUniversity of Rochester
InventorsMitchell L. Anthamatten, Jiahui Li
Life of this patent
Estimating the term…
Abstract
The present disclosure relates to Shape Memory Polymers (SMP's) comprising function groups that allow the polymers to be elastically deformed, utilized in the elastically deformed state, and subsequently returned to the original polymorphic shape.
Claims66
A polymer having the formula:
- —[HB]x-[MOD]y-[XL]z-
- comprising:
- i) hydrogen bonding units, HB, having at least one hydrogen bond donor moiety and at least one hydrogen bond acceptor moiety;
- ii) backbone modifier units, MOD;
- and
- iii) crosslinking units, XL, that are capable of forming one or more crosslinks;
- the indices x, y, and z represent the mole fraction of each unit, the index x is from about 0.1 to about 20, the index y is from about 75 to about 99.8, and the index z is from about 0.1 to about 5;
- wherein the polymer is characterized by having a shape memory temperature, TSM, such that the polymer can be elastically deformed at the shape memory temperature, and subsequently lowered to a shape memory freezing temperature, TF, and the method of elastic deformation is removed, the polymer will return to its original shape with a rate slower than the rate observed if the method of mechanical elastic deformation were removed at TSM;
- provided the shape memory freezing temperature TF is above the glass transition, TG, of the polymer, and provided the polymer is in the amorphous state at TF.
6 more elements
A shape memory polymer precursor having the formula:
- wherein the polymer comprises the following ratio:
- x is from 0.5 to 5:y is from 90 to 99:z is from 0.5 to 5, such that the sum of x+y+z=100;
- R20 is a reactive unit capable of reacting with another R20 unit in the presence of UV light to form a crosslinking unit.
A polymer formed by reacting:
- a) from about 0.5 to about 5 mol % of a monomer having the formula:
- b) from about 90 to about 99 mol % of a monomer having the formula:
- c) from about 0.5 to about 5 mol % of a monomer having the formula:
- wherein:
- each R1 and R2 is independently chosen from:
- i) hydrogen;
- ii) C1-C6 alkyl;
- iii) halogen;
- iv) cyano;
- and
- v) phenyl;
- R3 is chosen from:
- i) hydrogen;
- and
- ii) C1-C6 alkyl;
- and
- Q is a unit having at least one hydrogen bond donor moiety or at least one hydrogen bond acceptor moiety;
- the index m is from 1 to 4;
- each R9a, R9b, and R10 are independently chosen from:
- i) hydrogen;
- or
- ii) C1-C4 alkyl;
- R11 is a unit chosen from;
- i) hydrogen;
- i) C1-C4 linear or branched alkyl;
- ii) —NR12aR12b;
- iii) —C(O)OR3;
- iv) —C(O)R13;
- and
- v) —C(O)NR12aR12b;
- wherein R12a, R12b, and R13 are each independently hydrogen or C1-C10 alkyl;
- R14a, R14b, and R15 are each independently chosen from:
- iv) hydrogen;
- and
- ii) C1-C4 alkyl;
- R16 has the formula:
- —R17-J-R17—
- each R17 is independently chosen from
- i) —(CH2)pC(O)(CH2)q—;
- ii) —(CH2)pC(O)O(CH2)q—;
- iii) —(CH2)pOC(O)(CH2)q—;
- iv) —(CH2)pNH(CH2)q—;
- v) —(CH2)pC(O)NH(CH2)q—;
- vi) —(CH2)pNHC(O)(CH2)q—;
- vii) —(CH2)pNHC(O)NH(CH2)q—;
- viii) —(CH2)pNHC(═NH)NH(CH2)q—;
- and
- ix) —(CH2)pO(CH2)q—;
- the indices p and q have the value from 0 to 10;
- when p is 0 the —(CH2)— units are absent;
- when q is 0 the —(CH2)— units are absent;
- J is a unit having the formula:
- wherein each R19 is each independently chosen from:
- i) hydrogen;
- or
- ii) C1-C10 alkyl.
53 more elements
Dependencies are inferred from the claim text.