| 摘要 |
<p>The present invention relates to a composite material comprising a matrix material consisting essentially of polyurethane, said composite material having composition of about 40% to about 85% microspheres by volume and about 15% to about 60% matrix material by volume, and comprising also a plurality of reinforcement fibers. The reinforcement fibers are selected from the group consisting of carbon fibers, glass fibers, uni-directional fibers, cross woven fibers, matte fibers, fiber braid, uni-directional stitch woven carbon fibers, chopped fibers, and combination thereof. The microsphere particles may be hollow microspheres.
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