Method and apparatus for stereolithography

Details Method and apparatus for stereolithography Method and apparatus for stereolithography

1998-08-03

2000-09-12

Tentoni, Leo B.

Plastic and nonmetallic article shaping or treating: processes

Stereolithographic shaping from liquid precursor

264435, B29C 3508, B29C 4102

Patent

active

061173851

ABSTRACT:
A method and apparatus for producing ordered parts by stereolithography from non-ordered liquid crystal monomers. Liquid crystal monomers contain stiff, rod-like mesogenic segments which can be aligned by an external force such as shear, electric field or magnetic field, causing an anisotropy in properties. When cured in the aligned stated by photopolymerizing the aligned monomers the anisotropic structure is "locked in" resulting in materials with anisotropic physical and mechanical properties. The rigid structure of the mesogenic segments can result in cured networks with high glass transition temperatures if the spacer groups which connect the mesogenic core with the reactive end groups are kept short. Glass transition temperatures of postcured parts ranged from 75 to 148.degree. C. depending on resin and processing conditions. A mechanical anisotropy on the order of two was measured for aligned samples.

REFERENCES:
patent: 4810433 (1989-03-01), Takayanagi et al.
patent: 5545367 (1996-08-01), Bae et al.

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