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Synthesis and Crystallization Behavior Studies of Biodegradable Poly (Butylene Succinate), Poly (Ethylene Succinate) and Their Copolymers

Author: YangYan
Tutor: QiuZhaoBin
School: Beijing University of Chemical Technology
Course: Materials Science and Engineering
Keywords: Polybutylene succinate - ethylene terephthalate copolymer Crystal structure Crystallization Behavior Thermodynamic behavior Spherulitic morphology The ball crystal growth dynamics Crystalline transformation of the mode of
CLC: O631.3
Type: Master's thesis
Year: 2011
Downloads: 97
Quote: 2
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Abstract


This work was first synthesized by melt polycondensation of the two-step method of polybutylene succinate , polyethylene succinate and copolymers thereof , and WAXD, DSC, POM test means The synthesized polybutadiene 13,21,28 mol% acid butanediol diacrylate, ethylene glycol unit content of poly ( butylene succinate ) - ethylene terephthalate copolymer detailed study. In this section , we discuss the glycol copolymer unit of the crystal structure of the copolymer , the basic thermal behavior , Isothermal crystallization kinetics and mechanism of crystallization and melting behavior , spherulite morphology , spherulite growth kinetics of the law . The study found that the copolymerized units of ethylene glycol , the increase did not change the crystal structure and crystallization mechanism of the copolymer , but hindered the movement of the molecular chain , thereby slowing the non-isothermal crystallization , etc. Isothermal crystallization and spherulite growth rate . Moreover, with the crystalline temperature and increasing the content of the copolymerized units of ethylene glycol , the lower nucleation density of the copolymer . Growth kinetics found through research copolymer spherulites three copolymers have appeared crystalline manner II - III transition , and poly (butylene succinate) homopolymer of the same transition temperature and the crystallinity of the copolymer With increasing the content of the copolymerized units of ethylene glycol , to move to the low temperature . On the other hand , the thesis also contains 6 and 13 mol % butylene copolymer of polyethylene succinate unit - butanediol ester copolymer Preparation and crystallization behavior content to carry out research work , including copolymerization Preparation , crystal structure, the basic thermodynamic behavior , crystallization kinetics , spherulite morphology, spherulite growth kinetics , homopolymers and polyethylene succinate compare . The study found that adding a small amount of butanediol copolymerized units , does not change the crystal structure of poly ( ethylene succinate ) in the copolymer , but will reduce its degree of crystallinity , butanediol unit and no crystallinity , it is exist in the amorphous form . In addition, although the butylene glycol unit content of the copolymer is relatively small , but still impede the motion of the molecular chain of the ethylene glycol units , and reduces its crystallization rate . Poly ( ethylene succinate ) and polyethylene succinate the - butanediol ester copolymer , have appeared crystalline manner II - III transition .

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CLC: > Mathematical sciences and chemical > Chemistry > Polymer chemistry ( polymer ) > Polymer physics and physical chemistry of polymers > The chemical nature of polymers
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