| The design of the particle’s morphology and structure has been the research focus to ensure the material special properties. Acylate polymer (ACR) is one of the most common toughening agents due to its excellent weather resistance, process ability and toughness. In this paper the special three-layer structural ACR was designed to improve impact resistance of PVC. The effect of ACR’s physical morphology and chemical structure on impact strength of PVC was investigated.ACR’s morphology such as particle size and core-shell morphology play an important role in toughening PVC, which has been the research focus recently. The effects, emulsifier concentration, monomer mass fraction and so on, on the ACR’s morphology and the resulting impact strength of PVC was explored. Ensuring the same physical morphology, crosslinking ages were added to modify the structure of ACR. Effect of the type and mass fraction of the crosslink-age on the ACR’s structure such as Tg, elasticity modulus, elongation at break was researched. The way the ACR’s structure influence the comprehensive mechanics performance of PVC was studied..Comparing physical morphology’s with chemical structure’s influence on toughness of PVC, it was concluded that the particle size of ACR has a good impact on the impact resistance of PVC. What’s more, the toughness of PVC blends containing dual-sized particles was higher coupled with the produce of crazing and shear band. But it has two flaws: insufficient toughening; the most suitable size varies as the toughening system changes, which makes research hard. However, it became simpler to improve the impact strength by controlling the ACR’s structure. The results showed that when crosslink-age was6wt%-12wt%in the core and3wt%-9wt%in the inner shell, ACR had the best tensile property and tremendous fiber was observed on the fracture surface of PVC/ACR blends which led to its best mechanical property, process ability and stretch bending performance. |
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