Semi-crystalline shape memory polymer and production method thereof
AssigneeThe Hong Kong Polytechnic University
InventorsJinlian Hu, Yong Zhu, Jianping Han, Jing Lu
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Abstract
A semi-crystalline shape memory polymer with transition temperature near body temperature and the production method thereof is disclosed. The shape memory polymer comprises a polymer chain which further comprises a plurality of prepolymers and a plurality of chain extenders bonding the prepolymers together in which each prepolymer further comprises a plurality of synthesized units. The above mentioned synthesized unit is obtained by reacting polymer diol with first diisocyanate. The obtained synthesized units are polymerized together with second diisocyanate and chain extender to form the shape memory polymer.
Claims17
A method of producing a shape memory polymer, comprising the steps of:
- reacting a polymer diol with an aliphatic diisocyanate to form a modified polymer diol unit such that a molar ratio of said polymer diol to said aliphatic diisocyanate is in a range of 1.3:1 to 3:1;
- reacting said modified polymer diol unit with an aromatic diisocyanate to form a prepolymer;
- and
- polymerizing said prepolymer in a presence of a chain extender to produce said shape memory polymer.
A semi-crystalline shape memory polymer, comprising:
- a polymer chain having a chain extender and a prepolymer with a synthesized unit that includes a polymer diol and an aliphatic diisocyanate to form a modified polymer diol unit, wherein the shape memory polymer has a melting temperature ranging from 15° C. to 45° C., and wherein a molar ratio of said polymer diol to said aliphatic diisocyanate is in a range of 1.3:1 to 3:1,
- wherein said prepolymer further includes a connecting unit;
- said synthesized unit is bonded between two said connecting units;
- and said modified polymer diol unit is represented by the following formula (I):
- wherein n is an integer of 1 to 4;
- R is a molecular chain of said polymer diol having molecular weight of 1,000 to 2,500 g/mol and melting temperature of 25° C. to 55° C.;
- and R′ is an aliphatic segment of said aliphatic diisocyanate,
- wherein said connecting unit is an aromatic diisocyanate.
Dependencies are inferred from the claim text.