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A plasticiser lowers a polymer's glass transition temperature by

  • A.separating the chains and easing their movement
  • B.cross-linking the chains into a network
  • C.increasing the crystallinity of the polymer
  • D.raising the average molecular mass of the chains

Answer: A

A small molecule inserted between the chains reduces their mutual attraction, which is how rigid poly(vinyl chloride) becomes flexible sheeting. Its gradual loss by migration is why such articles stiffen and crack with age.

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