Explain the effect of molecular weight distribution on extrusion
What will be an ideal response?
Short, low molecular weight polymers will melt sooner than long polymers and will therefore act as lubricants for the longer, higher molecular weight polymers in the same resin. The longer polymers, however, give melt strength to the resin. Therefore, extrusion resins would generally have a wide molecular weight distribution so that the resin would flow easily but still have good melt strength.
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Annual egg production has decreased significantly since 1970, due to health concerns about the
cholesterol level in eggs.
Indicate whether the statement is true or false.Conservative Democrats who helped Ronald Reagan to pass his budget and tax-cutting legislation were called
A. blue dogs. B. sagebrush rebels. C. scalawags. D. neoconservatives. E. boll weevils.
The flow of water in a water distribution system is regulated by a _____
a. valve b. fixture c. cross-connection d. water meter
Which of the following statements is TRUE regarding a brazing project on a 3/16 in pipe with a 3 tip, the acetylene and oxygen regulators set at 7 psig, and that begins with heating the pipe first?
A) The oxygen regulator should be below 6 psig. B) The pipe should not be heated first while brazing. C) The acetylene regulator should be below 6 psig. D) The tip size is incorrect for a 3/16 in pipe.