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Citation: Wu Meiyan, Zhang Dong, Wei Ping. MODIFICATION OF POLYESTER-POLYETHER MULTIBLOCK COPOLYMERS VIA COPOLYMERIZATION[J]. Chinese Journal of Applied Chemistry, ;1988, 5(5): 34-38. shu

MODIFICATION OF POLYESTER-POLYETHER MULTIBLOCK COPOLYMERS VIA COPOLYMERIZATION

1.
Institute of Chemistry, Academia Sinica

Received Date: 20 August 1987
Available Online: 29 February 1988
Fund Project:

Polyester-polyether multiblock copolymers with relatively high content of hard segment and molecular weight of soft segment exhibit low compositional homogeneity and a large amount of CHCl₃ insoluble fraction with high melting point can be separated out.The addition of 5% mol of dimethyl isophthalate(DMI) as a comonomer during ester exchange reaction much improves the apparent compositional homogeneity of the multiblock copolymers. The polyethylene terephthalate-polyethylene glycol ether multiblock copolymers(PET-PEG) with hard segment of 40 wt% and PEG molecular weight of 4000 were synthesized with excellent mechanical properties and no CHCl₃ insoluble fraction.An alternative synthetic route has also been explored,according to which the PET is first acidolysed by isophthalic acid(IPA)and then copolycondensized with OH-terminated PEG to prepare PET-PEG with isophthalate units in hard segments.The compositional homogeniety of PET-PEG obtained greatly increases as the molecular weight of PEG decreases.
- Modification via copolymerization,
- Polyester-polyether,
- Multiblock copolymer,
- Segmented copolymer
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