BIOMASS COMPOSITIONS AND METHODS FOR THEIR PREPARATION
Described herein are compositions including a first polysaccharide having at least one substituent selected from —(CH 2 ) p O—X and —O—(CH 2 ) q —X, wherein X is —COOH, —NH 2 , or C 2 -C 10 alkenyl, each p is independently an integer of 0-10, and each q is independently an integer of 0-10, a second polysaccharide having at least one substituent selected from —(CH 2 ) s O—Y and —O—(CH 2 ) t —Y, wherein Y is each s is independently an integer of 0-10, and each t is independently an integer of 0-10, wherein the first polysaccharide and the second polysaccharide are coupled to each other through at least one crosslink formed between at least one X and at least one Y, and at least one of the following: at least one fiber reinforcing material, at least one curing accelerator, at least one coupling agent, or combinations thereof. Also described are methods of making such compositions and articles made of such compositions.
1 . A composition comprising:
a first polysaccharide comprising at least one substituent selected
from —(CH 2 ) p O—X and —O—(CH 2 ) q —X, wherein
X is —COOH, —NH 2 , or C 2 -C 10 alkenyl,
each p is independently an integer of 0, 1, 2, 3, 4, 5, 6, 7, 8, 9, or 10, and
each q is independently an integer of 0, 1, 2, 3, 4, 5, 6, 7, 8, 9, or 10; and
a second polysaccharide comprising at least one substituent selected
from —(CH 2 ) s O—Y and —O—(CH 2 ) t —Y, wherein
Y is
each s is independently an integer of 0, 1, 2, 3, 4, 5, 6, 7, 8, 9, or 10, and
each t is independently an integer of 0, 1, 2, 3, 4, 5, 6, 7, 8, 9, or 10;
wherein the first polysaccharide and the second polysaccharide are coupled to each other through at least one crosslink formed between at least one X and at least one Y.
2 . The composition of claim 1 , wherein X is —COOH.
3 . The composition of claim 1 , wherein Y is
4 . The composition of claim 1 , wherein X is —COOH and Y is
5 . The composition of claim 1 , wherein the first polysaccharide is of formula (I):
wherein each R 1 , R 2 , R 3 , R 4 , R 5 , R 6 and R 7 is independently selected from a polysaccharide of formula (I), a hydrogen, a hydroxyl group, a carboxyl group, an amino group, —O—, a straight or branched C 1 -C 10 alkyl, a straight or branched C 2 -C 10 alkenyl, a straight or branched C 2 -C 10 alkynyl, a straight or branched C 1 -C 10 heteroalkyl, a straight or branched C 2 -C 10 heteroalkenyl, and a straight or branched C 2 -C 10 heteroalkynyl, wherein each hydroxyl group, carboxyl group, amino group, —O—, straight or branched C 1 -C 10 alkyl, straight or branched C 2 -C 10 alkenyl, straight or branched C 2 -C 10 alkynyl, straight or branched C 1 -C 10 heteroalkyl, straight or branched C 2 -C 10 heteroalkenyl, and straight or branched C 2 -C 10 heteroalkynyl is substituted or unsubstituted;
wherein each R 8 is independently selected from a polysaccharide of formula (I), a hydrogen, a hydroxyl group, a carboxyl group, an amino group, a straight or branched C 1 -C 10 alkyl, a straight or branched C 2 -C 10 alkenyl, a straight or branched C 2 -C 10 alkynyl, a straight or branched C 1 -C 10 heteroalkyl, a straight or branched C 2 -C 10 heteroalkenyl, and a straight or branched C 2 -C 10 heteroalkynyl, wherein each hydroxyl group, carboxyl group, amino group, straight or branched C 1 -C 10 alkyl, straight or branched C 2 -C 10 alkenyl, straight or branched C 2 -C 10 alkynyl, straight or branched C 1 -C 10 heteroalkyl, straight or branched C 2 -C 10 heteroalkenyl, and straight or branched C 2 -C 10 heteroalkynyl is substituted or unsubstituted;
wherein each m is independently an integer of 0 or 1; and
wherein each n is independently an integer of 1 to 10.
6 .- 7 . (canceled)
8 . The composition of claim 5 , wherein when m is 0 and R 1 and R 2 are absent.
9 . The composition of claim 1 , wherein the first polysaccharide is a powder, and wherein the powder has an average particle diameter of about 5 microns to about 10 microns.
10 .- 15 . (canceled)
16 . The composition of claim 1 , wherein the first polysaccharide is present in the composition in an amount of about 5% to about 25% by mass.
17 . The composition of claim 1 , wherein the second polysaccharide is of formula (II):
wherein each R 1′ , R 2′ , R 3′ , R 4′ , R 5′ , R 6′ , and R 7′ is independently selected from a polysaccharide of formula (II), a hydrogen, a hydroxyl group, an epoxide, a (C 1 -C 10 alkyl)-epoxide, —O—, a straight or branched C 1 -C 10 alkyl, a straight or branched C 2 -C 10 alkenyl, a straight or branched C 2 -C 10 alkynyl, a straight or branched C 1 -C 10 heteroalkyl, a straight or branched C 2 -C 10 heteroalkenyl, and a straight or branched C 2 -C 10 heteroalkynyl, wherein each hydroxyl group, carboxyl group, amino group, —O—, straight or branched C 1 -C 10 alkyl, straight or branched C 2 -C 10 alkenyl, straight or branched C 2 -C 10 alkynyl, straight or branched C 1 -C 10 heteroalkyl, straight or branched C 2 -C 10 heteroalkenyl, and straight or branched C 2 -C 10 heteroalkynyl is substituted or unsubstituted;
wherein each R 8′ is independently selected from a polysaccharide of formula (II), a hydrogen, a hydroxyl group, an epoxide, a (C 1 -C 10 alkyl)-epoxide, a straight or branched C 1 -C 10 alkyl, a straight or branched C 2 -C 10 alkenyl, a straight or branched C 2 -C 10 alkynyl, a straight or branched C 1 -C 10 heteroalkyl, a straight or branched C 2 -C 10 heteroalkenyl, and a straight or branched C 2 -C 10 heteroalkynyl, wherein each hydroxyl group, carboxyl group, amino group, straight or branched C 1 -C 10 alkyl, straight or branched C 2 -C 10 alkenyl, straight or branched C 2 -C 10 alkynyl, straight or branched C 1 -C 10 heteroalkyl, straight or branched C 2 -C 10 heteroalkenyl, and straight or branched C 2 -C 10 heteroalkynyl is substituted or unsubstituted;
wherein each m′ is independently an integer of 0 or 1; and
wherein each n′ is independently an integer of 1 to 10.
18 .- 19 . (canceled)
20 . The composition of claim 17 , wherein when m′ is 0, R 1 , and R 2 are absent.
21 . The composition of claim 1 , wherein the second polysaccharide is a powder, and wherein the powder has an average particle diameter of about 5 microns to about 10 microns.
22 .- 27 . (canceled)
28 . The composition of claim 1 , wherein the second polysaccharide is present in the composition in an amount of about 5% to about 25% by mass.
29 . The composition of claim 1 , wherein the first polysaccharide and the second polysaccharide are present in the composition in a molar ratio of about 1:1.
30 . (canceled)
31 . The composition of claim 1 , wherein at least one of the first polysaccharide and the second polysaccharide is a homopolysaccharide.
32 . The composition of claim 1 , wherein at least one of the first polysaccharide and the second polysaccharide is a heteropolysaccharide.
33 . The composition of claim 1 , wherein at least one of the first polysaccharide and the second polysaccharide is biomass-derived, or a food gum.
34 .- 35 . (canceled)
36 . The composition of claim 1 , further comprising at least one reinforcing material, wherein the at least one reinforcing material is a wheat straw powder.
37 . (canceled)
38 . The composition of claim 36 , wherein the at least one reinforcing material has an average particle diameter of about 10 microns to about 100 microns, and wherein the at least one reinforcing material is present in the composition in an amount of about 40% to about 70% by mass.
39 .- 41 . (canceled)
42 . The composition of claim 1 , further comprising at least one curing accelerator, wherein the at least one curing accelerator comprises an imidazole catalyst, a tertiary amine catalyst, an organotin, or combinations thereof, and wherein the at least one curing accelerator is present in the composition in an amount of about 0.5% to about 5% by mass.
43 - 45 . (canceled)
46 . The composition of claim 1 , further comprising at least one coupling agent, wherein the at least one coupling agent comprises a silane coupling agent, a titanate coupling agent, an isocyanate silane coupling agent, an acrylic silane coupling agent, an epoxy silane coupling agent, a carboxylic acid coupling agent, or combinations thereof, and wherein the at least one coupling agent is present in the composition in an amount of about 0.1% to about 5% by mass.
47 .- 50 . (canceled)
51 . The composition of claim 1 , wherein the composition has a tensile strength of about 10 MPa to about 25 MPa.
52 . The composition of claim 1 , wherein the composition substantially degrades in about 20 weeks to about 30 weeks.
53 . A composition comprising:
a first polysaccharide comprising at least one substituent selected from —(CH 2 ) p O—X, and —O—(CH 2 ) q —X, wherein
X is —COOH, —NH 2 , or C 2 -C 10 alkenyl,
each p is independently an integer of 0, 1, 2, 3, 4, 5, 6, 7, 8, 9, or 10, and
each q is independently an integer of 0, 1, 2, 3, 4, 5, 6, 7, 8, 9, or 10; and
a second polysaccharide comprising at least one substituent selected from —(CH 2 ) s O—Y, and —O—(CH 2 ) t —Y, wherein
Y is
each s is independently an integer of 0, 1, 2, 3, 4, 5, 6, 7, 8, 9, or 10, and
each t is independently an integer of 0, 1, 2, 3, 4, 5, 6, 7, 8, 9, or 10;
wherein the first polysaccharide and the second polysaccharide are coupled to each other through at least one crosslink formed between at least one X and at least one Y;
at least one reinforcing material;
at least one curing accelerator; and
at least one coupling agent.
54 - 86 . (canceled)
87 . The composition of claim 53 , wherein the at least one reinforcing material is a wheat straw powder.
88 . The composition of claim 53 , wherein the at least one reinforcing material has an average particle diameter of about 10 microns to about 100 microns, and wherein the at least one reinforcing material is present in the composition in an amount of about 45% to about 50% by mass.
89 .- 90 . (canceled)
91 . The composition of claim 53 , wherein the at least one curing accelerator comprises an imidazole catalyst, a tertiary amine catalyst, an organotin, or combinations thereof.
92 . (canceled)
93 . The composition of claim 53 , wherein the at least one coupling agent comprises a silane coupling agent, a titanate coupling agent, an isocyanate silane coupling agent, an acrylic silane coupling agent, an epoxy silane coupling agent, a carboxylic acid coupling agent, or combinations thereof.
94 .- 96 . (canceled)
97 . A method of preparing a biomass composition comprising:
contacting
a first polysaccharide comprising at least one substituent selected
from —(CH 2 ) p O—X and —O—(CH 2 ) q —X, wherein
X is —COOH, —NH 2 , or C 2 -C 10 alkenyl,
each p is independently an integer of 0, 1, 2, 3, 4, 5, 6, 7, 8, 9, or 10, and
each q is independently an integer of 0, 1, 2, 3, 4, 5, 6, 7, 8, 9, or 10; and
a second polysaccharide comprising at least one substituent selected
from —(CH 2 ) s O—Y and —O—(CH 2 ) t —Y, wherein
Y is
each s is independently an integer of 0, 1, 2, 3, 4, 5, 6, 7, 8, 9, or 10, and
each t is independently an integer of 0, 1, 2, 3, 4, 5, 6, 7, 8, 9, or 10 to form a starting material;
heating the starting material, wherein the heating couples the first polysaccharide to the second polysaccharide through at least one crosslink formed between at least one X and at least one Y; and
adding
at least one reinforcing material,
at least one curing accelerator, and
at least one coupling agent,
resulting in the formation of a biomass composition.
98 . The method of claim 97 , wherein the heating step comprises heating at a temperature of about 130° C. to about 160° C., and wherein the heating step occurs for about 1 minute to about 5 minutes.
99 .- 100 . (canceled)
101 . The method of claim 97 , wherein the heating step comprises hot-pressing using a thermocompressor, and wherein the thermocompressor is coated with a demoulding agent.
102 .- 153 . (canceled)