Full-composition-range glass transition behavior of the polymer/solvent system poly (lactic acid) / ethyl butylacetylaminopropionate (PLA/IR3535®)

Du, Fanfan; Schick, Christoph; Androsch, René

doi:10.1016/j.polymer.2020.123058

Cited by 14 publications

(21 citation statements)

References 80 publications

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“…The samples were placed on conditioned and corrected UFS-1 sensors . Different heat-transfer conditions, besides variation of the sample mass, were realized by using silicone oil for improving the thermal contact between the sample and the sensor membrane and additional use of gold leaf with a thickness of 100 nm. , The latter also minimized baseline distortion due to mechanical stresses in the membrane by thermal contraction/dilation of the sample. Care was applied for positioning of the sample into the center of the heatable area of the membrane where the temperature profile is homogeneous .…”

Section: Experimental Sectionmentioning

confidence: 99%

The Narrow Thickness Distribution of Lamellae of Poly(butylene succinate) Formed at Low Melt Supercooling

2021

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Crystallization of poly(butylene succinate) (PBS) at 100 °C, about 30 K below the equilibrium melting temperature, allowed the preparation of crystals, which were analyzed regarding their zero-entropy-production melting temperature. Irreversible melting occurs in a rather narrow temperature window of only around 8 K, between 101 and 109 °C, revealing a narrow distribution of the thickness of isothermally formed lamellae and a rather low thickening/stabilization factor of less than 1.4. Quasiisothermal temperature-modulated differential scanning calorimetry suggests significant reversible melting and crystallization during and after crystallization, proving the existence of a large fraction of crystalline phase being at the stability limit at the crystallization temperature. Heating of crystals formed at 100 °C to above their zero-entropy-production melting temperature, followed by isothermal annealing, permitted the analysis of the kinetics of irreversible melting, yielding superheating-dependent rate constants of the order of magnitude of 10 2 s −1 5−10 K above the zero-entropy-production melting temperature. The advanced analysis of the melting behavior of polymer crystals isothermally grown at low melt supercooling allows one to draw conclusions about their (inherently) low thermodynamic stability.

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Section: Experimental Sectionmentioning

confidence: 99%

The Narrow Thickness Distribution of Lamellae of Poly(butylene succinate) Formed at Low Melt Supercooling

2021

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“…52304-36-6] were supplied by Sigma-Aldrich and Merck respectively. DEET exhibits a glass transition temperature ( T g ) of around 198 K [ 48 ] while IR3535 has a glass transition temperature ( T g ) of around 185 K and change of the specific heat capacity (Δ C p, IR3535 ( T g )) of 0.64 J/(g K) [ 8 ]. All compounds were used as received, i.e., without further purification.…”

Section: Methodsmentioning

confidence: 99%

“…Nevertheless, the mismanagement of waste in Africa is already impacting human and environmental health [ 5 ]. Therefore, the present study and other associated investigations [ 6 , 7 , 8 , 9 , 10 , 11 ] opted to investigate poly(lactic acid) as an alternative polymer matrix for repellent incorporation.…”

Section: Introductionmentioning

confidence: 99%

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Properties of Mosquito Repellent-Plasticized Poly(lactic acid) Strands

et al. 2021

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Poly(lactic acid) (PLA) is an attractive candidate for replacing petrochemical polymers because it is fully biodegradable. This study investigated the potential of PLA as a sustainable and environmentally friendly alternative material that can be developed into commercially viable wearable mosquito repellent devices with desirable characteristics. PLA strands containing DEET and IR3535 were prepared by twin screw extrusion compounding and simultaneously functioned as plasticizers for the polymer. The plasticizing effect was investigated by thermal and rheological studies. DSC studies showed that the addition of DEET and IR3535 into PLA strands reduced the glass transition temperature consistent with predictions of the Fox equation, thus proving their efficiency as plasticizers. The rheology of molten samples of neat PLA and PLA/repellents blends, evaluated at 200 °C, was consistent with shear-thinning pseudoplastic behaviour. Raman studies revealed a nonlinear concentration gradient for DEET in the PLA strand, indicating non-Fickian Type II transport controlling the desorption process. Release data obtained at 50 °C showed initial rapid release followed by a slower, near constant rate at longer times. The release rate data were fitted to a novel modification of the Peppas-Sahlin desorption model.

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“…As a result, a DEET-rich PLLA phase and a near pure DEET phase formed [ 27 ]. Worth noting, a similar investigation of the L−L demixing behavior has been recently performed on the system PLA/ethyl butylacetylaminopropionate (PLA/IR3535), that is, using a different promising mosquito repellent [ 28 ].…”

Section: Introductionmentioning

confidence: 99%

Melt-Spun Poly(D,L-lactic acid) Monofilaments Containing N,N-Diethyl-3-methylbenzamide as Mosquito Repellent

et al. 2021

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Malaria is still a major tropical disease, with Africa particularly burdened. It has been proposed that outdoor protection could aid substantially in reducing the malaria incidence rate in rural African communities. Recently, melt-spun polyolefin fibers containing mosquito repellents have been shown to be promising materials to this end. In this study, the incorporation of N,N‑Diethyl‑3‑methylbenzamide (DEET)—a popular and widely available mosquito repellent—in commercially available, amorphous poly(D,L-lactic acid) (PDLLA) is investigated with the aim of producing biodegradable mosquito-repelling filaments with a reduced environmental impact. It is shown to be possible to produce macroscopically stable PDLLA-DEET compounds containing up to 20 wt.-% DEET that can be melt-spun to produce filaments, albeit at relatively low take-up speeds. A critical DEET content allows for stress-induced crystallization during the spinning of the otherwise amorphous PDLLA, resulting in the formation of α-crystals. Although the mechanical integrity of the filaments is notably impacted by the incorporation of DEET, these filaments show potential as materials that can be used for Malaria vector control.

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Full-composition-range glass transition behavior of the polymer/solvent system poly (lactic acid) / ethyl butylacetylaminopropionate (PLA/IR3535®)

Cited by 14 publications

References 80 publications

The Narrow Thickness Distribution of Lamellae of Poly(butylene succinate) Formed at Low Melt Supercooling

The Narrow Thickness Distribution of Lamellae of Poly(butylene succinate) Formed at Low Melt Supercooling

Properties of Mosquito Repellent-Plasticized Poly(lactic acid) Strands

Melt-Spun Poly(D,L-lactic acid) Monofilaments Containing N,N-Diethyl-3-methylbenzamide as Mosquito Repellent

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