Centrifugally-molded articles and methods

A method of producing a first biopolymer article, the method comprising the following sequential steps:

• A) introducing a first biopolymer solution into a mold and optionally settling the first biopolymer solution into the mold;
• B) introducing a first aqueous-curing solution into the mold atop the first biopolymer solution and optionally settling the first curing solution into the mold;
• and
• C) subjecting the mold and contents of the mold to a first centrifugation and stopping after a first centrifugation length of time, thereby producing a first biosolidifying body;
• wherein waiting a first final biosolidification length of time following step C) produces a first biopolymer article from the first biosolidifying body.

A method of making a biopolymer article, the method comprising at least two iterative cycles of the following steps:

• X) introducing an iterative biopolymer solution into a mold and optionally settling the iterative biopolymer solution into the mold;
• Y) introducing an iterative curing solution into the mold atop the iterative biopolymer solution and optionally settling the iterative curing solution into the mold;
• and
• Z) subjecting the mold and the contents of the mold to an iterative centrifugation and stopping after an iterative centrifugal length of time, thereby iteratively adding to existing portions of a biosolidifying body, the iteratively introducing of step X), introducing of step Y), and subjecting of step Z) continuing until a final biosolidifying body is formed, wherein waiting a final biosolidification length of time following formation of the final biosolidification body produces the biopolymer article.

A controlled centrifugal solidification chitosan article, wherein the article is not a film, wherein at least a portion of the article comprises at least one characteristic centrifugal property selected from the group consisting of:

• i) a uniform density across the at least a portion of the article;
• ii) the at least a portion of the article is optically nontransparent;
• iii) the at least a portion of the article is free of exterior layering;
• iv) the at least a portion of the article is free of interior layering;
• v) the at least a portion of the article is interior-void-free;
• and
• vi) the at least a portion of the article is free of cylindrical extrusion gaps.