Effects of Silane Coupling Agents on Physical Properties of Simultaneous Biaxially Stretched Polylactide Film

Suttinun Phongtamrug, Patakorn Pilasen, Kitiya Ridthitid

Abstract

Simultaneous biaxial stretching by using high speed was shown to improve the toughness of the polylactide (PLA) film. Additionally, a silane coupling agent was utilized to increase the mechanical strength of the product by either physical or chemical bonding. Different types of silane coupling agents influenced product properties. In this study, three types of silane coupling agents, i.e. (3-chloropropyl)trimethoxysilane (CPS), 3-aminopropyltriethoxysilane (APS), and N-(2-aminoethyl)-3-aminopropyltrimethoxysilane (DMS), were selected and compounded with PLA by using 0.1–2 phr. This work investigated the effects of the blended silane coupling agent on the physical properties of biaxially stretched PLA films. The blended PLA sheets were manufactured by using a chill-roll cast film extruder and the biaxially stretched films were prepared by a biaxial stretcher. An existing silane coupling agent in PLA films was confirmed by infrared spectroscopy and energy-dispersive X-ray analysis. Furthermore, thermal and tensile properties of the obtained films were determined. Flexibility of biaxially stretched PLA film with a diamino silane coupling agent was increased while its stiffness was maintained. Elongation at break of the biaxially stretched PLA film blending with DMS was increased more than 2 times. Moreover, oxygen gas permeability and water vapor permeability of the biaxially stretched PLA films with 2 phr of APS and CPS were increased compared to those of the neat one. This work provided the structural effect of coupling agents on the physical properties of biaxially stretched PLA film.

Keywords

References

[1] L. T. Lim, R. Auras, and M. Rubino, “Processing technologies for poly(lactic acid),” Progress in Polymer Science, vol. 33, no. 8, pp. 820–852, 2008.

[2] C. Zhou, H. Li, W. Zhang, J. Li, S. Huang, Y. Meng, J. de Claville Christiansen, D. Yu, Z. Wu, and S. Jiang, “Thermal strain-induced cold crystallization of amorphous poly(lactic acid),” CrystEngComm, vol. 18, no. 18, pp. 3237–3246, 2016.

[3] C. Zhou, H. Li, W. Zhang, J. Li, S. Huang, Y. Meng, J. de Claville Christiansen, D. Yu, Z. Wu, and S. Jiang, “Direct investigations on strain-induced cold crystallization behavior and structure evolutions in amorphous poly(lactic acid) with SAXS and WAXS measurements,” Polymer, vol. 90, pp. 111–121, 2016.

[4] J. Takagi, T. Nemoto, T. Takahashi, T. Taniguchi, and K. Koyama, “Improvement of mechanical properties for poly(L-lactic acid) film through drawing process optimization,” Fiber, vol. 60, no. 7, pp. 230–234, 2004.

[5] P. Jariyasakoolroj, K. Tashiro, H. Wang, H. Yamamoto, W. Chinsirikul, N. Kerddonfag, and S. Chirachanchai, “Isotropically small crystalline lamellae induced by high biaxial-stretching rate as a key microstructure for super-tough polylactide film,” Polymer, vol. 68, pp. 234–245, 2015.

[6] P. Jariyasakoolroj, K. Tashiro, W. Chinsirikul, N. Kerddonfag, and S. Chirachanchai, “Microstructural analyses of biaxially oriented polylactide/modified thermoplastic starch film with drastic improvement in toughness,” Macromolecular Materials and Engineering, vol. 304, no. 9, 2019, Art. no. 1900340.

[7] P. Jariyasakoolroj, R. Supthanyakul, A. Laobuthee, A. Lertworasirikul, R. Yoksan, S. Phongtamrug, and S. Chirachanchai, “Structure and properties of in situ reactive blend of polylactide and thermoplastic starch,” International Journal of Biological Macromolecules, vol. 182, pp. 1238– 1247, 2021.

[8] R. Yoksan, K. M. Dang, A. Boontanimitr, and S. Chirachanchai, “Relationship between microstructure and performances of simultaneous biaxially stretched films based on thermoplastic starch and biodegradable polyesters,” International Journal of Biological Macromolecules, vol. 190, pp. 141–150, 2021.

[9] R. Al-Itry, K. Lamnawar, A. Maazouz, N. Billon, and C. Combeaud, “Effect of the simultaneous biaxial stretching on the structural and mechanical properties of PLA, PBAT and their blends at rubbery state,” European Polymer Journal, vol. 65, pp. 288–301, 2015.

[10] N. Jaouadi, R. Al-Itry, A. Maazouz, and K. Lamnawar, “Biaxial orientation of PLA/ PBAT/thermoplastic cereal flour sheets: Structure-processing-property relationships,” Polymers, vol. 15, no. 9, 2023, Art. no. 2068.

[11] L. Boonthamjinda, N. Petchwatana, S. Covavisaruch, W. Chinsirikul, and N. Kerddonfag, “Biaxially-stretched poly(lactic acid) (PLA) and rubber-toughened PLA films: tensile and physical properties,” Key Engineering Materials, vol. 659, pp. 363–367, 2015.

[12] X. Meng, N. A. Nguyen, H. Tekinalp, E. Lara- Curzio, and S. Ozcan, “Supertough PLA-silane nanohybrids by in situ condensation and grafting,” ACS Sustainable Chemistry & Engineering, vol. 6, no. 1, pp. 1289–1298, 2018.

[13] C. Han, J. Bian, H. Liu, L. Han, S. Wang, L. Dong, and S. Chen, “An investigation of the effect of silane water-crosslinking on the properties of poly(L-lactide),” Polymer International, vol. 59, no. 5, pp. 695–703, 2010.

[14] S. Phongtamrug, R. Makhon, and T. Wiriyosuttikul, “Enhanced performance of polylactide film via simultaneous biaxial stretching and silane coupling agent as a thermal shrinkable film,” Applied Science and Engineering Progress, vol. 16, no. 2, 2023, doi: 10.14416/j.asep.2022.02.008, Art. no. 5699.

[15] E. W. Fischer, H. J. Sterzel, and G. Wegner, “Investigation of the structure of solution grown crystals of lactide copolymers by means of chemical reactions,” Kolloid-Zeitschrift und Zeitschrift für Polymere, vol. 251, no. 11, pp. 980–990, 1973.

[16] G. Kister, G. Cassanas, M. Vert, B. Pauvert, and A. Térol, “Vibrational analysis of poly(L-lactic acid),” Journal of Raman Spectroscopy, vol. 26, no. 4, pp. 307–311, 1995.

[17] K. Bukka, J. D. Miller, and J. Shabtai, “FTIR study of deuterated montmorillonites: Structural features relevant to pillared clay stability,” Clays and Clay Minerals, vol. 40, no. 1, pp. 92–102, 1992.

[18] P. J. Launer, “Infrared analysis of organosilicon compounds: Spectra-structure correlations,” in Silicon Compounds: Silanes & Silicones, 3rd ed., B. Arkles, Ed. Pennsylvania: Gelest Inc, pp. 175–178, 2013.

[19] H. Li and M. A. Huneault, “Effect of nucleation and plasticization on the crystallization of poly(lactic acid),” Polymer, vol. 48, no. 23, pp. 6855–6866, 2007.

[20] J. Nomai, B. Suksut, and A. K. Schlarb, “Crystallization behavior of poly(lactic acid)/ titanium dioxide nanocomposites,” KMUTNB International Journal of Applied Science and Technology, vol. 8. No. 4, pp. 251–258, 2015.

[21] T. Ageyeva, J. G. Kovács, and T. Tábi, “Comparison of the efficiency of the most effective heterogeneous nucleating agents for poly(lactic acid),” Journal of Thermal and Analysis and Calorimetry, vol. 147, pp. 8199– 8211, 2022.

[22] M. L. Di Lorenzo, “Calorimetric analysis of the multiple melting behavior of poly(L-lactic acid),” Journal of Applied Polymer Science, vol. 100, no. 4, pp. 3145–3151, 2006.

[23] M. L. Di Lorenzo and R. Androsch, “Melting of α′- and α-crystals of poly(lactic acid),” AIP Conference Proceedings, vol. 1736, no. 1, 2016, Art. no. 020009.

[24] M. C. Righetti, M. Gazzano, M. L. Di Lorenzo, and R. Androsch, “Enthalpy of melting of α′- and α-crystals of poly(l-lactic acid),” European Polymer Journal, vol. 70, pp. 215–220, 2015.

[25] R. Bouza, A. Lasagabaster, M. J. Abad, and L. Barral, “Effects of vinyltrimethoxy silane on thermal properties and dynamic mechanical properties of polypropylene–wood flour composites,” Journal of Applied Polymer Science, vol. 109, no. 2, pp. 1197–1204, 2008.

[26] A. J. Müller, M. Ávila, G. Saenz, and J. Salazar, “Chapter 3-Crystallization of PLA-based Materials,” in Poly(lactic acid) Science and Technology: Processing, Properties, Additives and Applications. London, UK: Royal Society of Chemistry, pp. 66–98, 2015.

[27] M. Yang, J. Su, Y. Zheng, C. Fang, W. Lei, and L. Li, “Effect of different silane coupling agents on properties of waste corrugated paper fiber/ polylactic acid composites,” Polymers, vol. 15, 2023, Art. no. 3525.

[28] M. A. Ortenzi, L. Basilissi, H. Farina, G. D. Silvestro, L. Piergiovanni, and E. Mascheroni, “Evaluation of crystallinity and gas barrier properties of films obtained from PLA nanocomposites synthesized via in situ polymerization of L-lactide with silane-modified nanosilica and montmorillonite,” European Polymer Journal, vol. 66, pp. 478–491, 2015.

[29] C. C. Chu and A. Needleman, “Void nucleation effects in biaxially stretched sheets,” Journal of Engineering Materials and Technology, vol. 102, pp. 249–256, 1980.

[30] W. Fang, G. Liang, J. Li, and S. Guo, “Microporous formation mechanism of biaxial stretching PA6/ PP membranes with high porosity and uniform pore size distribution,” Polymers, vol. 14, 2022, Art. no. 2291.

[31] K. Chen, P. Li, X. Li, C. Liao, X. Li, and Y. Zuo, “Effect of silane coupling agent on compatibility interface and properties of wheat straw/polylactic acid composites,” International Journal of Biological Macromolecules, vol. 182, pp. 2108–2116, 2021.

[32] S. Yu, K. H. Oh, J. Y. Hwang, and S. H. Hong, “The effect of amino-silane coupling agents having different molecular structures on the mechanical properties of basalt fiber-reinforced polyamide 6,6 composites,” Composites Part B, vol. 163, pp. 511–521, 2019.

[33] J. Zhang, K. Tashiro, H. Tsuji, and A. J. Domb, “Disorder-to-order phase transition and multiple melting behavior of poly(L-lactide) investigated by simultaneous measurements of WAXD and DSC,” Macromolecules, vol. 41, pp. 1352–1357, 2008.

[34] J. Zhang, Y. Duan, H. Sato, H. Tsuji, I. Noda, S. Yan, and Y. Ozaki, “Crystal modifications and thermal behavior of poly(L-lactic acid) revealed by infrared spectroscopy,” Macromolecules, vol. 38, pp. 8012–8021, 2005.

[35] X. Z. Tang, P. Kumar, S. Alavi, and K. P. Sandeep, “Recent advances in biopolymers and biopolymer-based nanocomposites for food packaging materials,” Critical Reviews in Food Science and Nutrition, vol. 52, pp. 426–442, 2012.

[36] S. Marano, E. Laudadio, C. Minnelli, and P. Stipa, “Tailoring the barrier properties of PLA: A state-of-the-art review for food packaging applications,” Polymers, vol. 14, no. 8, 2022, Art. no. 1626.

[37] A. Guinault, C. Sollogoub, S. Domenek, A. Grandmontagne, and V. Ducruet, “Influence of crystallinity on gas barrier and mechanical properties of PLA food packaging films,” International Journal of Material Forming, vol. 3, pp. 603–606, 2010.

[38] S. Sato, T. Nyuui, G. Matsuba, and K. Nagai, “Correlation between interlamellar amorphous structure and gas permeability in poly(lactic acid) films,” Journal of Applied Polymer Science, vol. 131, 2014, Art. no. 40626.

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DOI: 10.14416/j.asep.2024.06.012

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