Biodegradable shape-memory polymers using polycaprolactone and isosorbide based polyurethane blends

Joo, Yoon-Suk; Cha, Jae‐Ryung; Gong, Myoung‐Seon

doi:10.1016/j.msec.2018.05.063

Cited by 74 publications

(57 citation statements)

References 44 publications

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“…In some very inspiring recent research, the L-lysine based ethyl ester l -lysine diisocyanate was compared to petrol-based hexamethylene diisocyanate, and isophorone diisocyanate in terms of reactivity and final properties of the PU [37,38,39,40,41] and even fully renewable thermoplastic poly(ester urethane urea)s were produced [42]. More studies on enzymatic breakdown/biodegradability of (biobased) PUs are conducted in recent years proving the importance of environmentally friendly PU applications [9,43,44,45,46,47].…”

Section: Introductionmentioning

confidence: 99%

Green Polyurethanes from Renewable Isocyanates and Biobased White Dextrins

Konieczny

Loos

2019

Polymers

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Polyurethanes (PUs) are an important class of polymers due to their low density and thermal conductivity combined with their interesting mechanical properties—they are extensively used as thermal and sound insulators, as well as structural and comfort materials. Despite the broad range of applications, the production of PUs is still highly petroleum-dependent. The use of carbohydrates in PU synthesis has not yet been studied extensively, even though, as multihydroxyl compounds, they can easily serve as crosslinkers in PU synthesis. Partially or potentially biobased di-, tri- or poly-isocyanates can further be used to increase the renewable content of PUs. In our research, PU films could be easily produced using two bio-based isocyanates—ethyl ester L-lysine diisocyanate (LLDI] and ethyl ester l-lysine triisocyanate (LLTI)—, one commercial isocyanate—isophorone diisocyanate (IPDI), and a bio-based white dextrin (AVEDEX W80) as a crosslinker. The thermal and mechanical properties are evaluated and compared as well as the stability against solvents.

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Section: Introductionmentioning

confidence: 99%

Green Polyurethanes from Renewable Isocyanates and Biobased White Dextrins

Konieczny

Loos

2019

Polymers

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“…Thermoplastic‐segmented polyurethanes and polyurethane‐ureas (PU and PUUs) are part of a wide family of polymeric materials. Their thermal, thermomechanical, and specific mechanical properties as well as their biocompatibility make them remarkably attractive materials for their use in different application fields such as automotive industry, biomaterials, and coatings . These materials are formed by a soft segment (SS) and a hard one (HS) constituted by a long chain diol, and by both an isocyanate and a chain extender, respectively.…”

Section: Introductionmentioning

confidence: 99%

Influence of the addition of PEG into PCL‐based waterborne polyurethane‐urea dispersions and films properties

Vadillo

Larraza²,

Arbelaiz³

et al. 2019

J of Applied Polymer Sci

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In this work, segmented waterborne polyurethane‐urea (WBPUU) dispersions containing hydrophobic polycaprolactone (PCL) and hydrophilic poly(ethylene glycol) (PEG) in different molar ratios are synthesized and used for the subsequent preparation of films by casting. The molar ratio of PEG is gradually increased up to 0.20 in order to analyze the effect of low hydrophilic PEG content (from 1.7 to 7.1 wt %) on the properties of resulting dispersions and films. Regarding the dispersions, the addition of PEG results in an increase of the particle size, from 86 ± 1 in the case of pure PCL‐based system to 112 ± 15 for systems containing 7.1 wt % of PEG, as well as in the formation of a core–shell structure in the particles. Films show different behaviors depending on their PEG content. WBPUUs containing just PCL or very low content of PEG in the soft segment present higher stiffness. However, the addition of PEG in a content of 3.4 wt % or higher hinder the ability of the short‐range ordering of the hard segment, increasing the elongation at break from 842 ± 102 MPa for PCL‐based WBPUU to 1312 ± 84 MPa for the system with the highest PEG content. Systems with higher PEG content form nanoparticles with more segregated core–shell structures inducing to the film a higher hydrophilicity. Hence, the addition of PEG to a PCL‐based WBPUU allows to tune the properties of the resulting film increasing the range of application of these materials. © 2019 Wiley Periodicals, Inc. J. Appl. Polym. Sci. 2020, 137, 48847.

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“…As the content of XHNBR is increased, the crystallization peak became broader, as shown in Fig. (b), which is attributed to reduced crystallinity of PA6 in the TPE blends . Moreover, it can be observed that the crystallization peak of PA6 in the TPE blends shifted to lower temperatures as the XHNBR content increased, which clearly suggests enhanced interfacial interactions …”

Section: Resultsmentioning

confidence: 82%

Toward superior applications of thermoplastic elastomer blends: double T_g increase and improved ductility

Burgoa

Hernandez

Vilas

2019

Polymer International

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With the aim of curbing air pollution and addressing climate change, the use of low density thermoplastic elastomers (TPEs) in transportation could be a useful way to lighten the vehicle weight. For that, melt blending of high performance rubber and thermoplastics is an attractive way of preparing high performance TPEs. In this work, several TPEs have been prepared by melt blending of hydrogenated acrylonitrile butadiene rubber (HNBR) with polyamide 6 (PA6), adding different amounts of carboxylated HNBR (XHNBR) as compatibilizer: 40/60/0, 40/42/18, 40/30/30 and 40/18/42 (PA6/HNBR/XHNBR). The resulting blends were investigated using melt rheological measurements, morphological observations (scanning electron microscopy and polarized optical microscopy), dynamic mechanical analysis, differential scanning calorimetry analysis and mechanical tests. A biphasic morphology was noted for all TPEs. An increase in XHNBR amount changes the morphology from dispersed to co-continuous. This evolution is explained by the change in the melt rheological properties of the HNBR/XHNBR rubber phase. Moreover, the introduction of 42% XHNBR resulted in an increase in the glass transition temperature of both rubber and PA6 phases. This double T g increase phenomenon was attributed to the interfacial interactions between the carboxyl groups in XHNBR and the amine end groups in PA6. Additionally, thermal analysis revealed a reduced crystallinity of PA6 in the blend, which corresponds to enhanced interfacial interactions. The interfacial adhesion and the co-continuous morphology resulted in an improved ductility. This study reveals the possibility of obtaining TPE blends with tunable thermal and mechanical properties by controlling both interfacial interactions and morphology.

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Biodegradable shape-memory polymers using polycaprolactone and isosorbide based polyurethane blends

Cited by 74 publications

References 44 publications

Green Polyurethanes from Renewable Isocyanates and Biobased White Dextrins

Green Polyurethanes from Renewable Isocyanates and Biobased White Dextrins

Influence of the addition of PEG into PCL‐based waterborne polyurethane‐urea dispersions and films properties

Toward superior applications of thermoplastic elastomer blends: double T_g increase and improved ductility

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Biodegradable shape-memory polymers using polycaprolactone and isosorbide based polyurethane blends

Cited by 74 publications

References 44 publications

Green Polyurethanes from Renewable Isocyanates and Biobased White Dextrins

Green Polyurethanes from Renewable Isocyanates and Biobased White Dextrins

Influence of the addition of PEG into PCL‐based waterborne polyurethane‐urea dispersions and films properties

Toward superior applications of thermoplastic elastomer blends: double Tg increase and improved ductility

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Toward superior applications of thermoplastic elastomer blends: double T_g increase and improved ductility