my country’s polyvinylidene chloride production has gradually increased and exports have increased

polyvinylidene chloride (pvdc) is a polymer with high barrier properties. it has a head-to-tail linear polymer chain structure, strong cohesion between molecules, and high crystallinity. the melting temperature of polyvinylidene chloride is between 198 and 205°c, and it mostly appears as a white porous powder under normal temperature and pressure. due to its strong polarity,…