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Study on Synthesis and Application of Polyether TPU for Toughening PVC

Author: ZhouWenJie
Tutor: LiZuoShe
School: Xi'an University of Science and Technology
Course: Chemical Technology
Keywords: PVC TPU Blend Toughening Mineral Reinforcing
CLC: TQ325.3
Type: Master's thesis
Year: 2011
Downloads: 133
Quote: 0
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Abstract


Polyvinyl chloride (PVC) is one kind of general synthetic resins with reactant and low price, but PVC must be modified because of its brittleness, bad thermal stability and poor processing performance. The results show that PVC with high impact toughness and processing performance can be obtained by blending with thermoplastic polyurethane elastomer (TPU). The special polyether TPU was devised and synthesized for toughening PVC.Polyether TPU was prepared with different molecular weight polyoxypropylene propylene-glycol ether (PPG-210,PPG-220,PPG-330), TDI and 1,4-BDO. In the conditions of isocyanate index R=1.02, temperature T=80℃and reaction time t=1 h, TPU with different ratio of soft and hard segments were synthesized. The hard segment content was determined in the TPU by elemental analysis, FTIR and molecular weight. Also, molecular structure of the TPU was inferred.PVC/TPU polymer alloy was obtained through blending by two-roll masticator. The structure and properties of materials were characterized by the mechanical properties, SEM and thermal analysis. The compatibility of PVC and TPU could be improved by adding a certain amount of CPE. The elongation at break of the materials raised 344%, when the CPE content was 16%. Also, the notched impact strength increased 742%. However, the tensile strength of the materials decreased by 29%. It was found that the size of the molecular weight polyether polyols had a certain degree effects for TPU of micro-phase separation. Phase separation to achieve optimal hard segment content required more, when the molecular weight polyether polyols was higher. The TPU with PPG-210 synthesized which dispersion index of smaller molecular weight was better modify for PVC. When the hard segment content is 50%, the tensile strength of the material is 26.39MPa, elongation at break is 122.4%, and the notched impact strength is 10.56kJ/m2. Compared with the product polyether TPU, the tensile strength and elongation changed a little, but the impact strength increased by 43%. Compared with the PVC materials, the elongation increased by 562% and the notched impact strength increased 878 %. Also, tensile strength decreased by 50%. The thermal stability of PVC materials were improved with the addition of the TPU.TPU with core-shell structure concealed were synthesized with Talc, Kaolin and MMT as filler. PVC/TPU/mineral filler composite materials were obtained by two-roll masticator. The results show that TPU/mineral with core-shell structure can not realized toughening and strengthening on PVC.

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CLC: > Industrial Technology > Chemical Industry > Synthetic resins and plastics industry > Polymer resin and plastic > PVC and plastic
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