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Multibiock-(AB),-copolymers, consisting of hard segments of poly(buty1ene terephthalate) (PBT) and soft segments of dimerized fatty acid were synthesized and analysed with DSC and DMTA. The polymers were characterized by their limiting viscosity number and melt flow index. The glass transition temperature (T,) and melting temperature (T,) increase with decreasing weight fraction of the dimerized fatty acid and with the increase of the crystalline phase content. It was found that the elasticity (E) depends on the content of dimerized fatty acid in the amorphous phase. Tensile properties were described as a function of the degree of polycondensation P, (molecular weight). ZUSAMMENFASSUNG:Multiblock-Copolymere aus harten Poly(butylenterephtha1at)-Segmenten und aus weichen Segmenten von dimerisierter Fettsaure wurden synthetisiert und mit Differentialkalorimetrie (DSC), dynamisch-mechanisch-thermischer Analyse ( DMTA), Kapillarviskosimetrie und durch Schmelzindex-Messung untersucht. Die Glastemperatur (T,) und die Schmelztemperatur (T,) steigen mit abnehmendem Gewichtsanteil der dimerisierten Fettsaure und mit zunehmendem kristallinen Anteil an. Es wurde festgestellt, dal3 die Elastizitat (E) von dem Gehalt an dimerisierter Fettsaure in der amorphen Phase abhangt. Die Festigkeitseigenschaften wurden als Funktion des Polykondensationsgrads (Pk) beschrieben.

The melt polycondensation method was investigated for the synthesis of a multiblock copolymer. The copolymer consisted of hard segments of poly(butylene terephthalate) (PBT) and soft segments of dimerised fatty acid. This multiblock copolymer was characterised by 1H and 13C NMR and FTIR spectroscopies and differential scanning calorimetry. The 1H NMR method was used for estimating quantitatively the amount of the hard/soft segments. The polymer morphology was characterised using light microscopy and transmission electron microscopy. The investigated polymer was used in a small amount as an additive to poly(propylene)/PBT blends in order to evaluate its influence on the morphology and impact properties of these blends.

Poly(ethylene terephthalate) modification with the monomer from renewable resources RAPID COMMUNICATION Summary-An emerging problem related to the development of biodegradable polymers from renewable resources was brought up in this work. Modification of petrochemical-based poly(ethylene terephthalate)(PET) with the use of bio-based monomer, namely dilinoleic acid (DLA) was presented. Series of multiblock copolymers containing oligo-PET as hard segments and DLA as soft segments was obtained in typical process of PET synthesis via polycondensation from the melt. PET/DLA copolymers containing W h = 30-90 wt. % of hard segments were characterized with respect to their mechanical, thermal and processing properties. It was demonstrated that at high concentration of DLA (W h = 30-40 wt. %) materials are susceptible to hydrolytic degradation. Key words: poly(ethylene terephthalate), biodegradable polyesters, dilinoleic acid, copolymer, thermal properties, mechanical properties. MODYFIKACJA POLI(TEREFTALANU ETYLENU) ZA POMOC¥ MONOMERU ZE RÓDE£ OD-NAWIALNYCH Streszczenie-Zaproponowano metodê otrzymywania z zastosowaniem surowców odnawialnych polimerów zdolnych do biodegradacji. Zastosowano poli(tereftalan etylenu)(PET), bêd¹cy produktem petrochemicznym, który modyfikowano za pomoc¹ kwasu dilinolowego (DLA) bêd¹cego monomerem bio-pochodnym, stanowi¹cym dimer kwasu t³uszczowego. Metod¹ polikondensacji w stopie otrzymano seriê kopolimerów zawieraj¹cych oligomery PET jako segmenty sztywne oraz DLA jako segmenty giêtkie. Kopolimery PET/DLA zawiera³y W h = 30-90 wt. % segmentów sztywnych. Zbadano ich w³aoeciwooeci mechaniczne, termiczne oraz przetwórcze. Wykazano, ¿e wysoka zawartooeae DLA (W h = 30-40 wt. %) sprzyja degradacji hydrolitycznej polimerów. S³owa kluczowe: poli(tereftalan etylenu), biodegradowalne poliestry, kwas dilinolowy, kopolimer, w³aoeciwooeci termiczne, w³aoeciwooeci mechaniczne.

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