H. Inata and S. Matsumura, “Chain Extenders for Polyesters III, Addition-Type Nitrogen-Containing Chain Extenders Reactive with Hydroxyl End Groups of Polyesters,” Journal of Applied Polymer Science, Vol. 32, No. 4, 1986, pp. 4581-4594.
http://dx.doi.org/10.1002/app.1986.070320423

has been cited by the following article:

• TITLE: Effects of Bifunctional Chain Extender on the Crystallinity and Thermal Stability of PET

  AUTHORS: Bo Liu, Qianwei Xu

  KEYWORDS: Poly(Ethylene Terephthalate); Chain Extender; Infrared Substractive Spectrum; Intrinsic Viscosity

  JOURNAL NAME: Journal of Materials Science and Chemical Engineering, Vol.1 No.6, November 13, 2013

  ABSTRACT: Effects of bifunctional chain extender on the crystallinity and the thermal stability of PET were studied in this work. Results of Infrared substractive spectrum indicated that one oxazoline ring of 2,2’-bis(2-oxazoline) (BOZ) reacted with one carboxyl in PET to generate a blocked PET chain with an oxazoline ring, which then reacted with one carboxyl in second PET to form an extended chain. The intrinsic viscosity (IV) of extended PET would increase from 0.61 of initial PET to 0.80 when the addition of BOZ was 0.52 wt%. Furthermore, when BOZ was used with hydroxyl-addition-type chain extender 2,2’-(1,4-phenyl)bis(4H-3,1-benzoxazin-4-one) (BNZ) or chain end modifier phthalic anhydride (PA), IV of chain extended PET would be 0.83 and 0.97 respectively. DSC results showed that chain extending would result in a decrease in crystallinity of PET. Comparing with initial PET, the intrinsic viscosity loss of the chain extended products would be smaller after multi-melting processing.