Bio-hybrid nanocomposite packaging materials from polysaccharides and nanoclay Jari Vartiainen VTT Technical Research Centre of Finland

Transcription

1 Bio-hybrid nanocomposite packaging materials from polysaccharides and nanoclay Jari Vartiainen VTT Technical Research Centre of Finland

2 2 Outline Bio-hybrid nanocomposite coatings from sonicated chitosan and nanoclay Vartiainen, Jari; Tuominen, Mikko; Nättinen, Kalle Journal of Applied Polymer Science. Vol. 116 (2010) No: 6, Bio-hybrid barrier films from fluidized pectin and nanoclay Vartiainen, Jari; Pere, Jaakko; Tapper, Unto; Tammelin, Tekla; Harlin, Ali Carbohydrate Polymers (2010) accepted

3 3 Target: shelf life extension Barrier packaging materials against oxygen, water vapour, grease and light transmission are needed to protect the foods from loosing their physiological (e.g. respiration of fruits) physical (e.g. desiccation, softening, dripping) and chemical (e.g. oxidation of lipids, pigments, vitamins) properties to extend shelf life or to improve sensory properties, while maintaining the quality of the food

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5 5 Tortuous path theory

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7 7 pectin chitosan

8 8 Bio-hybrid nanocomposite coatings from sonicated chitosan and nanoclay Vartiainen, Jari; Tuominen, Mikko; Nättinen, Kalle Journal of Applied Polymer Science. Vol. 116 (2010) No: 6,

9 9 SEM images of (a) typical nanoclay aggregates prior dispergation and (b) spincoated nanoclay platelets after ultrasonic dispergation Vartiainen, Jari; Tuominen, Mikko; Nättinen, Kalle Journal of Applied Polymer Science. Vol. 116 (2010) No: 6,

10 10 Plasma activation

11 11 Semi-industrial paper converting pilot-line Plasma station

12 12 SEM image of cross-section and surface topography of chitosan coatings on plasma-activated LDPE coated paper. Chitosan coatings with 0 wt% (a and b) and 67 wt% (c and d) of nanoclay, respectively.

13 13 Water contact angles of different coatings

14 14

15 XRD-patterns of chitosan films containing (a) 67 wt%, (b) 50 wt%, (c) 17 wt% of nanoclay, (d) pure powdery nanoclay, (e) chitosan film without nanoclay and (f) silicon base-line. 07/09/

16 16

17 17 Antimicrobial activity (JIS Z 2801)

18 18 Light absorption of chitosan films containing (a) 0%, (b) 17%, (c) 50% and (d) 67 wt% of nanoclay.

19 19 Oxygen transmission of chitosan films with different concentrations of nanoclay. Measurements were carried out at 23 C and 80% relative humidity.

20 20 Oxygen transmission of different coatings. Measurements were carried out at 23 C and 0, 50 and 80% relative humidity.

21 21 Particle concentration of 0.5 μm sized particles in air during rubbing of different coatings.

22 22 Bio-hybrid barrier films from fluidized pectin and nanoclay Vartiainen, Jari; Pere, Jaakko; Tapper, Unto; Tammelin, Tekla; Harlin, Ali Carbohydrate Polymers (2010) accepted

23 23

24 24 Spincoated nanoclay dispersion after ultrasonic treatment Spincoated nanoclay dispersion after fluidization treatment

25 25 Fluidization principle (Microfluidics)

26 26 Ultrasonic treatment AFM topography image (left) and phase contrast image (right) Fluidization treatment AFM topography image (left) and phase contrast image (right)

27 27 SEM image of a spincoated hybrid material of nanoclay and pectin after the high pressure fluidizer treatment. Spincoating is conducted from the hybrid solution containing high load (~30 wt%) of nanoclay.

28 28 SEM images of (left) pure solvent cast pectin barrier film (magnification ). The excerpt shows the rather featureless film surface in higher magnification ( ), (right) solvent cast hybrid film of pectin and nanoclay. The dry film contains ~30 wt% of nanoclay.

29 29 Visual appearance

30 30 XRD-patterns of solvent cast barrier films of pectin containing (a) ~30, (b) ~20, (c) ~10 wt% of nanoclay. As a reference materials curve (d) corresponds to nanoclay powder, (e) pure pectin film without nanoclay addition and (f) silicon baseline.

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32 32 Water vapour transmission (23 C, 50/100% RH)

33 33 Oxygen transmission (23 C) with different amounts of nanoclay cm 3 /(m 2 *24) wt% 10 wt% 20 wt% 30 wt% relative humidity (%)

34 34 Surface treating concept (SUTCO) developed at VTT

35 35

36 36 Conclusions Nanoclay was successfully dispersed in aqueous polysaccharide solutions using both ultrasonic mixing and high pressure fluidization. Nanocomposite films and multilayer coatings had improved barrier properties against oxygen, water vapour and UV-light transmission. The developed bio-hybrid materials can be potentially exploited as a safe and environmentally sound alternative for synthetic barrier packaging materials to extend shelf life of various foods.

37 37 Thank you!