First of all, the chemical structure of PVC film is one of the main reasons for its brittleness. PVC (polyvinyl chloride) is a highly polar polymer material that contains -Cl groups in its structure, which makes the overall rigidity increase and flexibility decrease, so it is easier to become brittle in cold environments. In addition, the impact resistance of PVC film is closely related to the type and amount of impact modifier, and if the formula design is unreasonable, it will also cause the material to become brittle at low temperatures.
Secondly, the production process and formulation design will also affect the toughness of PVC film. The toughness, fall resistance and strength of PVC film are all related to the components of CPE, MBS, plasticizer and so on in its formulation system. If the proportion of these ingredients in the formula is not appropriate, or the plasticization is not sufficient, it will cause the product to become brittle at low temperatures.
Finally, external environmental factors will also accelerate the embrittlement of PVC film. The low temperature environment will cause the interaction force between PVC molecules to increase and the impact resistance to deteriorate, thus making it easier to become brittle. In addition, prolonged exposure to ultraviolet light or certain chemicals can also accelerate the aging and embrittlement process of PVC films.