Cellulose acetate thermoplastics with high modulus, dimensional stability and anti-migration properties by using CA-g-PLA as macromolecular plasticizer (CROSBI ID 287347)
Prilog u časopisu | izvorni znanstveni rad | međunarodna recenzija
Podaci o odgovornosti
Xu, Ru-Meng ; Yang, Tian-Tian ; Vidović, Elvira ; Jia, Ruo-Nan ; Zhang, Jin-Ming ; Mi, Qin-Yong ; Zhang, Jun
engleski
Cellulose acetate thermoplastics with high modulus, dimensional stability and anti-migration properties by using CA-g-PLA as macromolecular plasticizer
Cellulose diacetate (CDA) can be melt-processed to produce numerous and widely-used plastic products. However, due to the high glass transition temperature (Tg) of CDA, the addition of up to 30 wt% of micromolecular plasticizers is indispensable, which significantly reduces the dimensional stability and raises safety concerns from the migration of plasticizers. In this work, a series of CDA-graft-poly(lactic acid) (CDA-g- PLA) copolymers were synthesized by ring-opening polymerization of lactide onto the hydroxyl groups of CDA. The resultant CDA-g-PLA copolymers possess adjustable degrees of substitution (DSPLA) and side chain length (DPPLA) by controlling the reaction time and feed ratio. The Tgs and thermal flow temperatures (Tfs) of CDA-g-PLA strongly depend on DPPLA, such as the Tgs decrease linearly with the increase of DPPLA. The CDA-g-PLA copolymers with the DPPLA of 3–9 can be directly processed to transparent plastics by melt processing without any external plasticizers, because of their low Tfs of 170–215 °C. More impressively, the CDA-g-PLA can act as the macromolecular plasticizer. The obtained CDA/CDA- g-PLA has higher storage modulus, flexural modulus and Young’s modulus than the commercial CDA plasticized with triethyl citrate. In addition, the CDA/CDA-g-PLA exhibits high dimensional stability and anti-migration property. During a long-term treatment at 80 °C and 60% humidity, the CDA/CDA-g-PLA can retain the initial shape. Therefore, this work not only proposes a facile method for achieving a direct thermoplastic processing of CDA, but also provides a macromolecular plasticizer for CDA to make lightweight, stable and safer biobased thermoplastics.
cellulose diacetate ; thermoplastic processing ; macromolecular plasticizer ; poly(lactic acid)
Glavni autori: Elvira Vidović i Jun Zhang
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Podaci o izdanju
38 (10)
2020.
1141-1148
objavljeno
0256-7679
1439-6203
10.1007/s10118-020-2470-2
Povezanost rada
Kemijsko inženjerstvo, Temeljne tehničke znanosti