Super-stretchable self-healing polymer
An elastic composition comprising the following structure: wherein: PDMS is polydimethylsiloxane having at least 5 dimethylsiloxane units; L is a bond or hydrocarbon linker; the asterisk (*) in A units denotes a connection point with an asterisk in B units, and at least one of the following linkages connect between connection points: r is an integer of at least 3; R is a hydrocarbon or siloxane-containing linking moiety; the composition includes a multiplicity of A units and multiplicity of B units; and a portion of the connection points are necessarily terminated by endcapping groups, wherein at least a portion of the endcapping groups are selected from the following structures: The invention also includes methods for making and using the above-described elastic composition.
1. An elastic composition comprising the following structure:
wherein:
PDMS is polydimethylsiloxane having at least 5 and no more than 100 dimethylsiloxane units;
L is a bond or hydrocarbon linker;
the asterisk (*) in A units denotes a connection point with an asterisk in B units, and at least one of the following linkages connect between connection points:
r is an integer of at least 4;
R is a hydrocarbon or siloxane-containing linking moiety;
the composition includes a multiplicity of A units and multiplicity of B units; and
a portion of the connection points are necessarily terminated by endcapping groups, wherein at least a portion of the endcapping groups are selected from the following structures:
2. The elastic composition of claim 1 , wherein PDMS is polydimethylsiloxane having at least 10 and no more than 100 dimethylsiloxane units.
3. The elastic composition of claim 1 , wherein PDMS is polydimethylsiloxane having at least 20 and no more than 100 dimethylsiloxane units.
4. The elastic composition of claim 1 , wherein the number of B units is greater than the number of A units.
5. The elastic composition of claim 1 , wherein the number of B units is at least double the number of A units.
6. The elastic composition of claim 1 , wherein R is a hydrocarbon linking moiety.
7. The elastic composition of claim 6 , wherein R has the structure —(CH 2 ) m —, wherein m is an integer of 2-20; one or more H atoms in R are optionally replaced with methyl or ethyl groups; one or more —O— or —NH— linkers optionally inserted between carbon atoms in R; one or more H atoms in R are optionally replaced with OH or NH 2 groups; and two H atoms on a carbon atom are optionally replaced with an O atom to result in a carbonyl group.
8. The elastic composition of claim 6 , wherein R comprises a ring.
9. The elastic composition of claim 1 , wherein R is a polysiloxane.
10. The elastic composition of claim 9 , wherein said polysiloxane has a molecular weight of 350-7400 g/mol.
11. The elastic composition of claim 9 , wherein R is a polydimethylsiloxane.
12. The elastic composition of claim 1 , wherein the elastic composition exhibits an ultimate elongation of at least or more than 100%.
13. The elastic composition of claim 1 , wherein the elastic composition exhibits an ultimate elongation of at least or more than 300%.
14. The elastic composition of claim 1 , wherein the elastic composition exhibits an ultimate elongation of at least or more than 600%.
15. The elastic composition of claim 1 , wherein the elastic composition exhibits an ultimate tensile strength of at least 50 kPa.
16. The elastic composition of claim 1 , wherein the elastic composition is a film having a thickness of 20-1000 microns.
17. The elastic composition of claim 1 , wherein PDMS is polydimethylsiloxane having at least 10 and no more than 50 dimethylsiloxane units.
18. The elastic composition of claim 1 , wherein PDMS is polydimethylsiloxane having at least 10 and no more than 20 dimethylsiloxane units.
19. A method for producing an elastic composition, the method comprising reacting the following components:
under conditions where C molecules and amino groups from molecules A and B undergo condensation to produce a product having the following structure:
wherein:
PDMS is polydimethylsiloxane having at least 5 and no more than 100 dimethylsiloxane units;
L is a bond or hydrocarbon linker;
the asterisk (*) in A units denotes a connection point with an asterisk in B units, and at least one of the following linkages connect between connection points:
r is an integer of at least 4;
R is a hydrocarbon or siloxane-containing linking moiety;
the composition includes a multiplicity of A units and multiplicity of B units; and
a portion of the connection points are necessarily terminated by endcapping groups, wherein at least a portion of the endcapping groups are selected from the following structures:
20. The method of claim 19 , wherein PDMS is polydimethylsiloxane having at least 10 and no more than 100 dimethylsiloxane units.
21. The method of claim 19 , wherein PDMS is polydimethylsiloxane having at least 20 and no more than 100 dimethylsiloxane units.
22. The method of claim 19 , wherein the number of B molecules is greater than the number of A molecules, and the number of B units is greater than the number of A units.
23. The method of claim 19 , wherein the number of B molecules is at least double the number of A molecules, and the number of B units is at least double the number of A units.
24. The method of claim 19 , wherein R is a hydrocarbon linking moiety.
25. The method of claim 19 , wherein R is a polysiloxane.
26. The method of claim 19 , wherein A molecules have the following structure:
wherein n is at least 4.
27. The method of claim 19 , wherein B molecules have the following structure:
wherein n is 0 or at least 1.
28. An elastic composition comprising the following structure:
wherein:
PDMS is polydimethylsiloxane having at least 5 and no more than 100 dimethylsiloxane units;
L is a bond or hydrocarbon linker;
the asterisk (*) in A units denotes a connection point with an asterisk in B units, and at least one of the following linkages connect between connection points:
r is an integer of at least 3;
R is a hydrocarbon linking moiety;
the composition includes a multiplicity of A units and multiplicity of B units; and
a portion of the connection points are necessarily terminated by endcapping groups, wherein at least a portion of the endcapping groups are selected from the following structures:
29. A method for producing an elastic composition, the method comprising reacting the following components:
under conditions where C molecules and amino groups from molecules A and B undergo condensation to produce a product having the following structure:
wherein:
PDMS is polydimethylsiloxane having at least 5 and no more than 100 dimethylsiloxane units;
L is a bond or hydrocarbon linker;
the asterisk (*) in A units denotes a connection point with an asterisk in B units, and at least one of the following linkages connect between connection points:
r is an integer of at least 3;
R is a hydrocarbon linking moiety;
the composition includes a multiplicity of A units and multiplicity of B units; and
a portion of the connection points are necessarily terminated by endcapping groups, wherein at least a portion of the endcapping groups are selected from the following structures: