Naslov
Study of Biobased and Conventioanl Polymers for Engineering of New Materials

Autori
Vidović, Elvira ; Jukić, Ante ; Faraguna, Fabio ; Blažic, Roko ; Zhang, Jun ; Zhang, Jinming ; Xu, Rumeng

Vrsta, podvrsta i kategorija rada
Sažeci sa skupova, sažetak, znanstveni

Skup
9th International Symposium on Engineering Plastics, EP 2019

Mjesto i datum
Yinchuan, Kina, 07.08.2019. - 10.08.2019

Vrsta sudjelovanja
Pozvano predavanje

Vrsta recenzije
Međunarodna recenzija

Ključne riječi
polylactide ; poly(methyl methacrylate) ; cellulose diacetate, blends

Sažetak
It is often said that we are living in the plastic age because polymers are used for long time and for many applications. Conventional polymers have been thoroughly studied and combined in countless combinations. Recently, biobased polymers are becoming increasingly attractive. Polylactide (PLA) is one of the most interesting among them due to its outstanding characteristics such as biodegradation and biocompatibility. PLA as pure homopolymer or combined with other materials, e.g. copolymers, blends or composites, is widely explored for different applications [1]. We also investigated the possibilities of designing new materials using PLA. Blends of poly(L-lactide) (PLLA) with poly(methyl methacrylate) (PMMA) in Brabender mixer were prepared. Increasing fraction of PMMA in blends caused the increase of glass transition temperature (Tg) from 58 °C up to 93 °C as recorded by differential scanning calorimetry (DSC). Mechanical properties of blends assessed by the loss factor (tan δ) were improved significantly with respect to pure PLLA while the flexibility of PLLA/PMMA blends gradually decreased as recorded by dynamic mechanical analysis (DMA), Fig. 1 [2]. Furthermore, PLLA proved more stable, i.e. displayed greater resistance to degradation during processing due to introduction of PMMA fraction. Another study encompassed a series of cellulose diacetate (CDA) grafted polylactic acid copolymers (CDA-g-PLAs) synthesized by ring opening polymerization of L-lactide (LA) on the residual hydroxyl of CDA. The Tg and melt flow temperatures (Tf) were significantly affected by side chain length of polylactide (DPPLA), whereat the Tg decreased linearly with the increase of DPPLA. Additionally, the CDA-g-PLA copolymers were tested as macromolecular plasticizer in the melt processing of CDA. Those samples showed higher storage modulus, flexural modulus and Young's modulus in comparison with CDA plastized by 30 mass. % triethyl citrate plasticizer. Therefore, it seems as a promising method for thermoplastic processing of superior and more ecofriendly CDA.

Izvorni jezik
Engleski

Znanstvena područja
Kemijsko inženjerstvo

POVEZANOST RADA