Impact of Water in the Casting of Cellulosic Film from Ionic Liquid Solutions

• Autorzy: Wawro D. , Stęplewski W. , Madaj W. , Michud A. , Hummel M. , Sixta H.

Identyfikatory

DOI

10.5604/12303666.1152718

Warianty tytułu

PL

Wpływ wody w procesie wytwarzania folii celulozowej z roztworów cieczy jonowej

• Języki publikacji: EN

Abstrakty

EN

This study addresses in detail the role of water in the consecutive steps of film forming: cellulose dissolution, regeneration and drying, and its impact on the mechanical properties of the cellulose film. Prehydrolysis kraft (PHK) pulp was subjected to hydrothermal treatment (HT) prior to its dissolution in 1-ethyl-3-methylimidazolium acetate [emim]OAc. After the treatment, the DP of the pulp was 440 and the polydispersity index was as low as 3.1. HT pretreated pulp was dissolved in [emim]OAc with a water content of 2, 7, 14 and 21 wt%. The pulp dissolution was completed within 15 min regardless of the water content in the solvent. The rheological behavior, one of the key properties in film formation, was determined at varied temperature and cellulose concentration. Cellulose films were prepared from solutions with cellulose concentrations of 8, 12 and 16 wt% at a temperature of 90 °C. The impact of water on the macromolecular, morphological and mechanical properties of the transparent films prepared was thoroughly studied. With a very low polydispersity of the cellulose chain, the films prepared revealed high strength ranging from 87 to 106.5 MPa at elongation from 10 to 50% in conditioned state.

W artykule przedstawiono wpływ wody w poszczególnych etapach procesu formowania folii celulozowej z roztworów cieczy jonowej. Omówiono proces rozpuszczania celulozy, wpływ zestalania i suszenia na właściwości mechaniczne folii celulozowej. Do badań zastosowano masę celulozową drzewną PHK po obróbce hydrotermicznej (HT) o stopniu polimeryzacji DP 440, niskiej polidyspersji PDI 3,1 i o zróżnicowanej zawartości wody w celulozie 2, 7, 14 i 21%. Zbadano rozpuszczalność celulozy HT w cieczy jonowej oraz właściwości reologiczne roztworów. Celuloza HT ulega rozpuszczeniu w cieczy jonowej w czasie 15 minut niezależnie od zawartości wody. Opisano sposób formowania folii z roztworów o stężeniu celulozy 8, 12 i 16% w temperaturze 90 oC. Wykazano wpływ wody w roztworach przędzalniczych na właściwości roztworów, a następnie na właściwości mechaniczne folii. Oznaczono właściwości cząsteczkowe i morfologię transparentnych folii celulozowych. Folie celulozowe charakteryzowały się niskimi wartościami polidyspersji, wytrzymałością w zakresie 87–106,5 MPa i wydłużeniem 10-50% w stanie aklimatyzowanym.

Słowa kluczowe

EN

transparent cellulose film; water; cellulose hydrothermal treatment; ionic liquid (IL); morphological properties; mechanical properties

PL

transparentna folia celulozowa; woda; formowanie folii celulozowej; ciecz jonowa; właściwości morfologiczne; właściwości mechaniczne

• Wydawca: Sieć Badawcza Łukasiewicz - Łódzki Instytut Technologiczny
• Czasopismo: Fibres & Textiles in Eastern Europe
• Rocznik: 2015
• Tom: Vol. 23, no. 4 (112)
• Strony: 25--32
• Opis fizyczny: Bibliogr. 32 poz., rys., tab.

Twórcy

autor

Wawro D.

• Institute of Biopolymers and Chemical Fibres, Łódź, Poland

autor

Stęplewski W.

• Institute of Biopolymers and Chemical Fibres, Łódź, Poland

autor

Madaj W.

• Institute of Biopolymers and Chemical Fibres, Łódź, Poland

autor

Michud A.

• Department of Forest Products Technology, Aalto University, Aalto, Finland

autor

Hummel M.

• Department of Forest Products Technology, Aalto University, Aalto, Finland

autor

Sixta H.

• Department of Forest Products Technology, Aalto University, Aalto, Finland

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