Synthesis and characterization of novel random copolymers based on PBN: Influence of thiodiethylene naphthalate co-units on its polymorphic behaviour
✍ Scribed by M. Soccio; M. Gazzano; N. Lotti; L. Finelli; A. Munari
- Publisher
- Elsevier Science
- Year
- 2010
- Tongue
- English
- Weight
- 917 KB
- Volume
- 51
- Category
- Article
- ISSN
- 0032-3861
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✦ Synopsis
a b s t r a c t Poly(butylene/thiodiethylene naphthalate) copolymers (PBN-PTDEN) were synthesized in bulk according to the usual polycondensation procedure and examined by NMR, GPC, TGA, DSC and XRD techniques. At room temperature they appeared as semicrystalline materials; the copolymerization caused a lowering in the T g value, a decrement of T m and of the crystallization rate. Pure aor b 0 -form was obtained at low and high TDEN unit content, respectively; crystalline form transition never occurred in the solid state, analogously to PBN. After cooling from the melt, the pure a-form was always evidenced in PBN-PTDEN10, whereas the pure b 0 crystal phase develops in the copolymers containing 30 and 40 mol% TDEN units, independently on the cooling rate. In the case of PBN-PTDEN20 a pure aor b 0 -form was obtained at low and high cooling rate, respectively.