how does the mastication reduce the viscosity of natural rubber?

Question

i want know the answer from the morphology point of view

Answer 1

Rubber and mastication? Way too easy to make a joke.

Answer 2

Mastication reduces the viscosity of NR by shearing the Polyisoprene polymers, but it's difficult to get a uniform level of shearing. This is why increasing the plasticity/decreasing the viscosity of NR is also done by heat and the addition of other chemicals to break these polymer bonds.