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High modulus polymer composites and methods of making the same

Inactive Publication Date: 2006-10-19
COLORADO SCHOOL OF MINES
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Benefits of technology

[0014] In certain embodiments, catalysts may be used to increase the initiation rate or polymerization rate of the monomer(s) or to increase the rate of the interchange reactions or both. The polymerization and interchange reactions can be stopped through the use of a compound that deactivates one or more catalysts used in these processes.

Problems solved by technology

However, microscopy studies suggested a lack of interfacial adhesion between the polymer matrix and the fiber surface.

Method used

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  • High modulus polymer composites and methods of making the same
  • High modulus polymer composites and methods of making the same
  • High modulus polymer composites and methods of making the same

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[0045] The methods of the present invention are exemplified here by the formation of a polylactic acid (PLA)-cellulose composite polymer formed by an interchange reaction including transesterification of the lactide by the PLA in the presence of a transesterification catalyst.

[0046] L-lactide and pre-formed polylactide (PLA) were purchased from Cargill Dow Polymers, now NatureWorks, (Minnetonka, Minn.) and used without further purification. Lactide was dried under vacuum (22 inch Hg) at 50° C. for at least 8 hours prior to use. PLA was dried under vacuum (25 inch Hg) at 80° C. for at least 14 hours before being processed.

[0047] The cellulose fibers used in this study (CreaTech TC 2500) were supplied by CreaFill Fibers Corp (Chestertown, Md.). These fibers have an average length of 900 μm and an average width of 20 μm (L:D ratio=45). In order to remove surface impurities and increase surface reproducibility, the fibers were pretreated according to the following procedure: 1) 10 g f...

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Abstract

The invention provides methods of producing composite polymers by combining fillers with polymers in the presence of preformed high molecular weight polymer. Monomer polymerization can be initiated through the addition of initiators or by reactive chemical groups on the surface of the fibers. The composite materials formed possess superior mechanical properties compared to similar polymer composites made by either purely mechanical mixing or solely polymerization of monomers in the presence of the fillers.

Description

CROSS REFERENCE TO RELATED APPLICATION [0001] This application claims the benefit of priority under 35 U.S.C. §119(e) from U.S. Provisional Patent Application No. 60 / 660,972 filed Mar. 11, 2005, which is incorporated herein in its entirety by this reference.GOVERNMENT INTEREST [0002] This invention was made with government support under Environmental Protection Agency (EPA)-grant RD-83153001-1. The government has certain rights in the invention.FIELD OF THE INVENTION [0003] The invention relates to polymer composites and more particularly, the invention provides novel methods of making high molecular weight filled polymeric matrices having desirable physical characteristics. BACKGROUND OF THE INVENTION [0004] The introduction of fibers and other fillers into a polymeric matrix is an established route to enhancing the physical properties of a chosen polymer provided good dispersion and intimate interfacial adhesion can be achieved. This method can also be very cost effective providin...

Claims

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Application Information

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IPC IPC(8): B29C47/00B29C48/04
CPCB29C47/0004B29C47/0011B29C47/362B29K2105/0002Y10T428/2991C08J5/045C08J2367/04Y10T428/2998B29K2105/06B29C48/022B29C48/04B29C48/362
Inventor DORGAN, JOHN R.BRAUN, BIRGIT
Owner COLORADO SCHOOL OF MINES
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