Assessing rheometry for measuring the viscosity-average degree of polymerisation of cellulose in paper degradation studies

Heritage Science

Research

Anne-Laurence Dupont¹  Sabrina Paris-Lacombe¹  Johan P. M. Hoefnagels²  Ruth Cardinaels³  Siavash Maraghechi⁴  Akke S. J. Suiker⁴  Emanuela Bosco⁴ 

[1] Centre de Recherche sur la Conservation (CRC), National d’Histoire Naturelle, CNRS, Ministère de la Culture, 36 rue Geoffroy Saint Hilaire, 75005, Paris, France;Department of Mechanical Engineering, Mechanics of Materials, Eindhoven University of Technology, Eindhoven, The Netherlands;Department of Mechanical Engineering, Processing and Performance of Materials, Eindhoven University of Technology, Eindhoven, The Netherlands;Department of Chemical Engineering, Soft Matter Rheology and Technology, KU Leuven, Leuven, Belgium;Department of the Built Environment, Applied Mechanics, Eindhoven University of Technology, Eindhoven, The Netherlands;

关键词: Paper degradation;    Ageing of cellulose;    Degree of polymerisation;    Glass capillary viscometry;    Rheometry;   

DOI  :  10.1186/s40494-022-00855-7

 received in 2022-09-30, accepted in 2022-12-29,  发布年份 2022

来源: Springer

【 摘 要 】

In paper degradation studies, the viscosity-average degree of polymerisation (DPv) is often used as a key indicator of the extent of degradation of cellulosic paper. DPv can be deduced from the viscosity of dilute paper solutions, as typically measured through glass capillary viscometry. The current study proposes an efficient, alternative method to evaluate DPv of cellulosic paper, which is based on rotational rheometry. The proposed methodology relies on the application of a shear flow in a thin film of cellulose solution to measure its dynamic viscosity, from which DPv can be subsequently derived in a straightforward fashion. Rheometry allows to measure the viscosity for a range of shear rates, which results in multiple DPv evaluations per sample, and thus in statistically representative data from an individual test. Further, rheometry typically requires considerably less paper mass per test than glass capillary viscometry, which makes the method attractive for paper degradation studies with limited sample availability. Also, rheometry measurements are less work-intensive than glass capillary viscometry measurements. The rheometry method has been applied to 4 hygrothermally aged cellulose paper samples and the unaged counterpart. The measurement results regarding the age-dependency of DPv and the number of cellulose chain scissions are compared to those obtained by glass capillary viscometry, showing a very good agreement. At a longer ageing time, both experimental methods reveal a non-linear decrease in time of DPv, and a non-linear increase in time of the number of cellulose chain scissions, which indicate that the cellulose ageing process is realistically captured. The agreement in measurement results further demonstrates that rheometry is an easy-to-use, accurate and efficient alternative for DPv measurements by glass capillary viscometry.

【 授权许可】

CC BY   
© The Author(s) 2023

【 图 表 】

41116_2022_35_Article_IEq182.gif

41116_2022_35_Article_IEq181.gif

41116_2022_35_Article_IEq180.gif

Fig. 42

Fig. 4

41116_2022_35_Article_IEq179.gif

41116_2022_35_Article_IEq178.gif

41116_2022_35_Article_IEq177.gif

41116_2022_35_Article_IEq176.gif

41116_2022_35_Article_IEq175.gif

Fig. 39

Fig. 2

41116_2022_35_Article_IEq174.gif

41116_2022_35_Article_IEq173.gif

41116_2022_35_Article_IEq172.gif

41116_2022_35_Article_IEq171.gif

Fig. 7

Fig. 5

Fig. 2

41116_2022_35_Article_IEq169.gif

41116_2022_35_Article_IEq168.gif

Fig. 2

Fig. 4

41116_2022_35_Article_IEq165.gif

Fig. 2

Fig. 1

Fig. 1

41116_2022_35_Article_IEq162.gif

41116_2022_35_Article_IEq161.gif

Fig. 2

41116_2022_35_Article_IEq159.gif

41116_2022_35_Article_IEq158.gif

41116_2022_35_Article_IEq156.gif

41116_2022_35_Article_IEq155.gif

41116_2022_35_Article_IEq154.gif

41116_2022_35_Article_IEq153.gif

41116_2022_35_Article_IEq152.gif

Fig. 1

41116_2022_35_Article_IEq150.gif

41116_2022_35_Article_IEq149.gif

41116_2022_35_Article_IEq148.gif

41116_2022_35_Article_IEq147.gif

41116_2022_35_Article_IEq146.gif

41116_2022_35_Article_IEq145.gif

41116_2022_35_Article_IEq144.gif

41116_2022_35_Article_IEq135.gif

41116_2022_35_Article_IEq131.gif

41116_2022_35_Article_IEq129.gif

41116_2022_35_Article_IEq118.gif

41116_2022_35_Article_IEq96.gif

Fig. 1

Fig. 4

41116_2022_35_Article_IEq60.gif

40249_2022_1049_Article_IEq35.gif

40249_2022_1049_Article_IEq34.gif

Fig. 5

41116_2022_35_Article_IEq43.gif

Fig. 62