High-modulus low-shrinkage

Leads to the decoupling of molecular orientation responsible for increased modulus and strength, from oriented chains responsible for entropic shrinkage, allowing for high modulus low shrinkage fiber products. 

Polycyclohexylethylene (PCHE) is a new metallocene resin, developed by Dow as a replacement for PC in the production of optical discs. PCHE has low shrinkage (0.02% after 24 hrs), higher hght transmission than PC (91.9% vs. 89.8%, respectively) and high flex modulus of 71 GPa. Commercial production is to start by the year 2000. 

For industrial use, high-tenacity yarns, such as the tire cord, have to be drawn under conditions where low heat shrinkage, low extension, and high modulus products are produced. In fact, a tire cord is a highly specialized product, and complete integrated continuous polymerization spiiming and drawing plants (cp-spin-draw) have been developed. The process is little discussed in the open literature and the reader is directed to the patents of DuPont, Fiber Industries, and Allied Chemical Corporation (none of these companies currently exist as fiber producers). 

Performance in adhesives is outstanding. Polarity, reactivity, low shrinkage, high modulus and strength, heat and chemical resistance all contribute to wide use in auto, aero-... 

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