Improving mechanical performance of thermoplastic adhesion joints by atmospheric plasma

Fombuena, Vicent; Balart, J.; Sànchez-Nácher, Lourdes; Sanoguera, David García

doi:10.1016/j.matdes.2012.11.031

Cited by 44 publications

(27 citation statements)

References 29 publications

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“…Thus, water contact angle measurements were conducted to study the surface hydrophobicity/hydrophilicity of PP films ( Figure ). PP is a well‐known hydrophobic material . In the present work, surface hydrophobicity of PP was in general reduced with the addition of antioxidants, particularly with 3‐hydroxiflavone, but still showing higher water contact angle values than 65°, that implies a hydrophobic surface .…”

Section: Resultsmentioning

confidence: 47%

Enhancing the Thermal Stability of Polypropylene by Blending with Low Amounts of Natural Antioxidants

Hernández‐Fernández

Rayón

López

et al. 2019

Macro Materials & Eng

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Natural antioxidants are added in very low amounts to protect a polypropylene (PP) matrix against thermo‐oxidative degradation during processing. Thus, PP is melt‐blended with caffeic, chlorogenic, trans‐ferrulic, and p‐coumaric acids, and also with flavone and 3‐hydroxyflavone at 0.1 wt% with respect to the PP matrix. Neat PP and PP blended with three traditional antioxidants are prepared for comparison. A complete structural, thermal, and mechanical characterization is conducted. Ferrulic acid and particularly caffeic acid increases the thermal stability, showing also the highest activation energy. The structural changes of PP‐based films due to the polymer thermal degradation at high temperature (i.e., 400 °C) followed by FTIR reveal that antioxidants effectively delay the thermal degradation process. The wettability and the mechanical performance are also studied to get information regarding the industrial application of such films. While caffeic acid provides a more flexible material, ferrulic acid provides higher water resistance. Finally, AFM‐QNM shows that PP with caffeic acid has the highest miscibility.

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Section: Resultsmentioning

confidence: 47%

Enhancing the Thermal Stability of Polypropylene by Blending with Low Amounts of Natural Antioxidants

Hernández‐Fernández

Rayón

López

et al. 2019

Macro Materials & Eng

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“…The contact angle was determined by randomly putting drops of distilled water (=2 µ L) with a syringe onto the PU and PU nanocomposites surfaces and, after 30 s, the average value of ten contact angle measurements for each drop was used. The maximum standard deviation in the water contact angle (WCA) measurements did not exceed ± 3% [35].…”

Section: Characterization Techniquesmentioning

confidence: 95%

Biodegradable nanocomposites based on poly(ester-urethane) and nanosized hydroxyapatite: Plastificant and reinforcement effects

Navarro-Baena

Arrieta

Sonseca

et al. 2015

Polymer Degradation and Stability

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The processing and characterization of biodegradable nanocomposites based on poly(ester-urethane)s reinforced with different amounts (0.5, 1 and 3 wt %) of nanosized hydroxyapatite (nHA) are reported. The selected poly(ester-urethane) was synthesized starting from a tri-block copolymer based on poly(ε-caprolactone) (PCL) and poly(L-lactic acid) (PLLA). The nanocomposites were prepared by extrusion and by press molding. Several techniques were applied to investigate the properties of the nanocomposites. Electron microscopy revealed that the poly(ester-urethane) matrix is able to phase separate and that the addition of well-dispersed nanofillers modifies the dimension of the segregated phase. The thermal stability of the PU matrix, regulated by the PLLA block, decreased when low contents of nHA (0.5 and 1 wt %) were added, even if the thermal stability of the PCL-block was increased for each nHA amount. The good mechanical response of the nanocomposites confirmed the absence of agglomerates in the dispersion of the nanofillers in the polymeric matrix. The nHA presence also increased the surface hydrophilicity. Furthermore, rheology measurements, mechanical and thermal tests demonstrated the different behavior induced by the addition of nHA in different amounts. In fact, nHA acts as plasticizer at low concentrations (0.5, 1 wt %) and as reinforcement at a higher nHA amount (3 wt %). In vitro degradation tests were performed using a phosphate buffer solution. The results reported here are relevant for the development of nanocomposites based on a biodegradable and biocompatible polymeric matrix reinforced with small amounts of biocompatible nanofillers for different applications, especially in the biomedical field.Keywords: mechanical properties; phase morphology; nanocomposite; poly(lactide); biodegradable; poly(ester-urethane) Abbreviations DMA: Dynamic-mechanical analysis; DSC: Differential scanning calorimetry; FE-SEM: Field emission electron microscopy; HA: Hydroxyapatite; HDI: hexamethylene diisocyanate; nHA: Nanosized hydroxyapatite; PU: poly(ester-urethane); PU+0.5 HA: Nanocomposite of poly(ester-urethane) with 0.5 wt % of HA; PU+1 HA: Nanocomposite of poly(ester-urethane) with 1 wt % of HA; PU+3 HA: Nanocomposite of poly(ester-urethane) with 3 wt % of HA; PCL: Poly(ε-caprolactone); PLLA: Poly(Llactic acid); TEM: Transmission electron microscopy; Tg: Glass transition temperature; 3 TGA: Thermogravimetric analysis; Tm: melting temperature; WCA: water contact angle.

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“…PLA shows an average contact angle of 66.4° which is lower than typical polyolefins, i.e. poly(ethylene) -PE, poly(propylene) -PP, with contact angles close to 90° [51,52]. With regard to PBAT, due to its chemical structure, its water contact angle [53].…”

Section: Effect Of Compatibilizers On Surface Andmentioning

confidence: 99%

Manufacturing and compatibilization of PLA/PBAT binary blends by cottonseed oil-based derivatives

Carbonell‐Verdu¹,

Ferri²,

Dominici³

et al. 2018

Express Polym. Lett.

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Abstract. This research work aims at the compatibilization of poly(lactic acid)/poly(butylene adipate-co-terephthalate), PLA/PBAT binary blends by using cottonseed oil derivatives, i.e. epoxidized (ECSO) and maleinized (MCSO) cottonseed oil. The potential of these vegetable oil-based compatibilizers are compared versus the effects of a conventional styreneacrylic oligomer. The base PLA/PBAT binary blend composition was 80 wt% PLA/20 wt% PBAT and the amount of compatibilizer was set to 1 and 7.5 wt%. The effects of the different compatibilizers were evaluated on PLA/PBAT films in terms of mechanical and thermal properties as well as blend's morphology by field emission scanning electron microscopy (FESEM). Complementary, biodisintegration tests in controlled compost soil and surface properties were evaluated to assess the effects of the compatibilizers. Addition of 1 wt% ECSO and MCSO led to a remarkable increase in the elongation at break up to values over 100% with regard to neat PLA. Despite this, maximum elongation at break was obtained for the compatibilized PLA/PBAT blend with 7.5 wt% MCSO, reaching values of about 321.2% respect neat PLA keeping mechanical resistant properties, such as Young's modulus and tensile strength, at high levels. Therefore, vegetable oil-derived compatibilizers stand out as environmentally friendly additives for PLA/PBAT binary blends with improved properties.

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Improving mechanical performance of thermoplastic adhesion joints by atmospheric plasma

Cited by 44 publications

References 29 publications

Enhancing the Thermal Stability of Polypropylene by Blending with Low Amounts of Natural Antioxidants

Enhancing the Thermal Stability of Polypropylene by Blending with Low Amounts of Natural Antioxidants

Biodegradable nanocomposites based on poly(ester-urethane) and nanosized hydroxyapatite: Plastificant and reinforcement effects

Manufacturing and compatibilization of PLA/PBAT binary blends by cottonseed oil-based derivatives

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