Synthesis of processable ACR and its application in PVC
To address the processing difficulties such as difficult plasticization,long blending times,incomplete plasticization during the blending process of Polyvinyl Chloride(PVC)/CaCO3,and market pain points like rough surface and lack of gloss of the products.,a processing-type acrylate copolymer(ACR-P)was designed and synthesized with tert-dodecyl mercaptan(TDDM)as chain transfer agent.The effects of the addition amount of TDDM and ACR-P on the mechanical properties,rheological behavior,microstructure,and plasticization effect of the PVC/CaCO3/ACR-P blends were explored.The results show that with the increase in the addition amount of TDDM,the intrinsic viscosity of ACR-P gradually decreases,and the tensile strength and storage modulus of the PVC/CaCO3/ACR-P blends significantly increase,while the plasticization time is substantially shortened,with a slight increase in impact strength and elongation at break.When the addition mass fraction of TDDM is 0.8%,the tensile strength of the blend reaches 52.79 MPa,a 50.28%increase compared to PVC/CaCO3,the plasticization time is reduced from 71 s to 32 s.The increase in the addition amount of ACR-P significantly affects the mechanical properties and processing performance of the PVC/CaCO3/ACR-P blends.When the addition amount of ACR-P is 10 phr,the tensile strength of the blend reaches 61.12 MPa,an 87.6%increase compared to PVC/CaCO3,the plasticization time is reduced from 115 s to 25 s.Dynamic thermomechanical analysis shows that the PVC/ACR-P blend has only one glass transition peak,indicating that the PVC resin and ACR-P form a compatible system.Scanning electron microscope observations reveal that the interface between the two phases in the PVC/CaCO3 composite material is clear,while the introduction of ACR-P makes the interface of the blend blurred,indicating that the compatibility of the blend is improved,and both mechanical properties and processing performance are enhanced.
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