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Home Optical Systems Self-reinforced-composite-of-thermotropic-liquid-crystal-polymers

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Details
Inventors: Isayev, Avraam I.; Subramanian, Pazampalaco R.;
Assignee: University of Akron (Akron, OH)
Primary Examiner: Short; Patricia
Assistant Examiner:
Attorney, Agent or Firm: Oldham & Oldham Co.

Blend of two or more thermotropic liquid crystal polymers and process for preparing same. Blends of this invention contain at least two, preferably only two, thermotropic liquid crystal polymers which are melt processable. These liquid crystal polymers are wholly aromatic polyesters. At least two polymers in the blend are processable in the melt phase and phase separated in the solid phase. Solid reinforcing agents may be present, but are not necessary and in any case must be in the solid phase at temperatures at which the blend is melt processable. Products of this invention are formed in the melt phase under high strain conditions.

DETAILED DESCRIPTION What is claimed is: 1.
A blend of thermotropic liquid crystal polymers, said liquid crystal polymers having overlapping melt processing temperature ranges; each of said liquid crystal polymers being a wholly aromatic polyester, at least two of said liquid crystal polymers being phase separated in the solid state; said blend having a matrix phase and a fiber reinforcing phase which is formed in situ under high strain melt processing conditions; said blend containing a maximum of 98 percent by weight of any one liquid crystal polymer and conversely at least 2 percent combined weight of all other liquid crystal polymers present, based on total weight of liquid crystal polymers in said blend; said blend having greater tensile strength at break and higher impact strength than those of any constituent liquid crystal polymer in pure form.
2.
A blend as claimed in claim 1 wherein a major portion of said reinforcing phase is in the form of elongated fibers having diameters not greater than about 10 microns.
3.
A blend according to claim 2 wherein the preponderance of said elongated fibers have aspect ratios greater than about 10.
4.
A blend according to claim 2 wherein a preponderance of said elongated fibers are essentially unidirectionally oriented.
5.
A blend according to claim 1 said blend consisting essentially of said liquid crystal polymers.
6.
A blend according to claim 5 in which each liquid crystal polymer is a wholly aromatic co-polyester.
7.
A blend according to claim 1, said blend also containing solid reinforcing agents which are not liquid crystal polymers, each such reinforcing agent being solid at all temperatures at which said blend is melt processable.
8.
A blend according to claim 1, said blend being a binary blend of two thermotropic liquid crystal polymers.
9.
A blend as claimed in claim 1, said blend also having a higher tensile modulus than that of any constituent liquid crystal polymer in pure form.
10.
A blend of thermotropic liquid crystal polymers as claimed in claim 1, said blend being anisotropic


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