Poly(β-pinene) as an efficient biobased tackifier for metallocene poly(ethylene) based hotmelt adhesives. (April 2022)

• Record Type: Journal Article
• Authors: Gaspar, A.S.; Cordeiro, J.B.; Simões, P.A.; Gameiro, D.; Rocha, F.A.; Serra, A.C.; Coelho, J.F.J.; Fonseca, A.C.
• Is Part Of: International journal of adhesion & adhesives. Volume 114(2022)
• Publication Date: 2022-04
• Subjects: Hot melt adhesives -- mPE -- poly(β-pinene) -- Bio-based adhesives; Adhesion -- Periodicals; Adhesives -- Periodicals; Adhésion (Physique) -- Périodiques; Adhésifs -- Périodiques; Adhesie; Kleefstoffen; Adhesion; Adhesives; Periodicals; 668.3
• DOI: 10.1016/j.ijadhadh.2022.103111
• Languages: English
• ISSNs: 0143-7496

Abstract

Abstract: In this work, poly(β-pinene) was used for the first time as a biodegradable and renewable tackifier for hot melt adhesives (HMA) based on poly(ethylene) catalyzed by metallocenes (mPE). The HMA formulations were prepared using only poly(β-pinene) as tackifier or using mixtures of the terpene with the hydrocarbon resin C5 ((poly(β-pinene): C5: 80:20; 60:40; 50:50; 40:60; 20:80). An HMA formulation containing only C5 was also prepared for comparison purposes. The results of the thermal analysis showed that the addition of poly(β-pinene) to the formulations increased their thermal stability as well as the value of melting temperature ( T m ) and crystallization temperature ( T c ). Dynamic mechanical thermal analysis (DMTA) showed that the formulation containing both tackifiers in a weight ratio of 50% had a higher degree of homogeneity compared to the other formulations. Regarding the mechanical properties, the results showed that the addition of higher amounts of poly(β-pinene) resulted in stiffer materials. The values for modulus of elasticity, tensile strength, and elongation at break were similar to those obtained with poly(ethylene-co-vinyl acetate)-based HMA (EVA), the most commonly used HMA. Regarding viscosity, the results show that increasing amounts of poly(β-pinene) increase the viscosity of the formulation. When both tackifiers are used in a weight ratio of 50%, the viscosity is very similar to the formulation with the C5 resin.