Properties of PBST ester with different topological structures
Poly(butylene succinate-co-butylene terephthalate)ester films(PBST-Kx)with different topological structures and branching chains were prepared by solution casting,and the structure and properties of PBST-Kx were studied by 1H NMR,GPC,TG,DSC,XRD,and rheological tests.The experimental results show that the addition of a branching agent does not affect the chemical composition,thermal stability,and crystallization properties of the PBST-Kx molecular chain.However,as the degree of functionality of the branching degree increases,the number of branching chains of PBST-Kx increases,the molecular weight Mn of PBST-Kx reduces,and the molecular weight distribution widens.The addition of a branching structure improves the melt viscosity of PBST-Kx,which makes it have higher elasticity and longer relaxation time.With the increase in branching degree,the tensile strength and elongation at break of PBST-Kx decrease.
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