Foam precursor with high amylose starch and methods thereof

A foam, comprising:

• a starch, wherein the starch is at least 25% by weight amylose content;
• a lubricant;
• and
• a linear polysaccharide different from the starch, wherein a density of the foam is from 0.01 g/cm3 to 0.5 g/cm3, wherein a composition of the foam includes a starch weight percent representative of the starch included in the foam and a polysaccharide weight percent representative of the linear polysaccharide included in the foam, and wherein the starch weight percent is greater than the polysaccharide weight percent.

A method, comprising:

• inputting a first mixture of solid materials into an extruder having a plurality of temperature-controlled zones, wherein the first mixture includes a starch and a lubricant, wherein the starch is at least 25% by weight amylose content;
• inputting a second mixture including a linear polysaccharide different from the starch included in the first mixture into the extruder;
• forming a first blend by mixing at least the first mixture and the second mixture together as the first mixture and the second mixture propagate through the plurality of temperature-controlled zones;
• and
• outputting the first blend as a first extrudate from the extruder, the first extrudate corresponding to a foam precursor, wherein a composition of the foam precursor includes a starch weight percent representative of the starch included in the foam precursor and a polysaccharide weight percent representative of the linear polysaccharide included in the foam precursor, wherein the starch weight percent is greater than the polysaccharide weight percent, and wherein a first density of the foam precursor is from 0.5 g/cm3 to 1.5 g/cm3.