Effect of Isoalkyl Lactates as Pendant Group on Poly(acrylic acid)

Purushothaman, M.; Krishnan, P. Santhana Gopala; Nayak, Sanjay K.

doi:10.1080/10601325.2014.906251

Cited by 11 publications

(7 citation statements)

References 35 publications

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“…The azeotropic distillation method for synthesis of alkyl lactates, alkyl lactate acrylates, and alkyl lactate methacrylates, and the polycondensation method for the synthesis of PLA have been well documented. 33 -38 The inherent viscosity of PLA was calculated using Ubbelohde viscometer at 30 ± 0.1°C by dissolving the synthesized PLA in pre-dried and distilled THF at concentration of 0.5 g dL −1 , and the value obtained was 0.38 dL g −1 . Ghalia and Dahman have reported inherent viscosity of 0.37 dL g −1 for PLA synthesized by polycondensation which was shown to have a weight-average molecular weight ( true M ¯ w ) of about 28,400 Da and number-average molecular weight ( true M ¯ n ) of about 14,947 Da which is a relevant molecular weight for PLA.…”

Section: Resultsmentioning

confidence: 99%

RETRACTED: Evaluation of intercalation and interaction in in-situ polymerized PLA-HNT bionanocomposites

Manju

Krishnan

Nayak

2020

Polymers and Polymer Composites

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We report the in-situ synthesis of poly(lactic acid)–halloysite nanotubes (PLA-HNT) bionanocomposites, with a perspective to improve the interaction between PLA and HNT. Three PLA-HNT bionanocomposites with different HNT weight percentages were synthesized by polycondensation, followed by azeotropic distillation technique. Fourier transform infrared spectroscopy studies indicated the existence of hydrogen bonding between terminal hydroxyl groups of PLA and Si–O–Si groups present in the outer surface of HNT. Wide-angle X-ray diffraction, 29Si- and 27Al-nuclear magnetic resonance spectroscopy analysis confirmed the intercalation of PLA into HNT. Scanning electron microscopy analysis confirmed that there was no significant agglomeration and PLA matrix was found to be embedded with HNT. Transmission electron microscopy analysis also gave ample proof to substantiate the intercalation of PLA chains into HNT. Studies on zeta potential of PLA-HNT bionanocomposites, as compared with PLA, also confirmed the interactions between PLA and HNT. Single melting peak in differential scanning calorimetry analysis indicated the existence of one form of crystalline structure.

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Section: Resultsmentioning

confidence: 99%

RETRACTED: Evaluation of intercalation and interaction in in-situ polymerized PLA-HNT bionanocomposites

Manju

Krishnan

Nayak

2020

Polymers and Polymer Composites

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“…The chemical structure of EL and DML is also of great appeal to expand the scope of potential application of these green solvents as sustainable feedstock for sustainable polymer synthesis. − Their secondary alcohol offers a simple access to monovinyl derivatives for use in either free or living radical chain growth polymerizations (FRP and LRP, respectively). In this regard, a few publications reported that acrylic and methacrylic derivatives of lactic acid esters (i.e., methyl, ethyl, butyl) are suitable to polymerize by FRP to yield water-insoluble rubbery polymers. − More recently, our group also reported that well-defined polymers derived from this toolbox of monomers are easily accessible by Cu(0) wire-mediated SET-LRP. , However, vinylic derivatives of N -alkyl lactamides and polymers thereof are only reported in the old patent literature, and no study on their physical properties, LRP as well as block copolymer (BCP) synthesis, is yet available to the best of our knowledge.…”

Section: Introductionmentioning

confidence: 99%

Photoinduced Upgrading of Lactic Acid-Based Solvents to Block Copolymer Surfactants

Bensabeh

Moreno

Roig

et al. 2019

ACS Sustainable Chem. Eng.

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We report a new strategy toward the development of block copolymer surfactants from chemicals of the lactic acid family. A particularly unique aspect of this work is the use of green solvents as biobased platform chemicals to generate well-defined and nanostructure-forming materials. Herein, efficient functionalization of ethyl lactate (EL) and N,N-dimethyl lactamide (DML) solvents with acrylate groups generated monomers that could be polymerized by the photoinduced copper-catalyzed living radical polymerization process to yield polymeric materials with different water solubilities. These lactic acid-derived monomers were used as a major component in well-defined diblock copolymers composed of poly(EL acrylate) and poly(DML acrylate) segments as hydrophobic and hydrophilic building blocks, respectively. The resulting amphiphilic copolymers could self-assemble in aqueous solution to form nanoparticles with different morphologies (e.g., large-compound micelles and vesicles). Subsequently, the formed amphiphilic polymers were employed as efficient stabilizers in the emulsion polymerization of methyl methacrylate and styrene, offering a facile method for the synthesis of well-defined and stable polymer latexes in the range of 100–200 nm, demonstrating the practical significance of these biobased polymers in nanomaterial synthesis.

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“…[ 27,28 ] Seven poly(alkyl lactate acrylate)s such as poly(hexyl lactate acrylate) (P6), poly(heptyl lactate acrylate) (P7), poly(octyl lactate acrylate) (P8), poly(nonyl lactate acrylate) (P9), poly(decyl lactate acrylate) (P10), poly(undecyl lactate acrylate) (P11), and poly(dodecyl lactate acrylate) (P12) were synthesized following the method reported earlier by our group. [ 29‐33 ] The lactic acid derivatives such as alkyl lactates and alkyl lactate acrylates were synthesized by following the azeotropic distillation method using Dean‐Stark apparatus. The esterification reaction for the preparation of alkyl lactates was carried out using lactic acid and different higher alcohols such as hexanol, heptanol, octanol, nonanol, decanol, undecanol, and dodecanol using toluene as the azeotropic solvent to yield hexyl lactate, heptyl lactate, octyl lactate, nonyl lactate, decyl lactate, undecyl lactate, and dodecyl lactate, respectively.…”

Section: Methodsmentioning

confidence: 99%

Performance of higher poly(alkyl lactate acrylate)s as viscosity modifiers in vegetable oils

Manju

Krishnan

Nayak

2020

Vinyl Additive Technology

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Recently, bio‐derived materials such as vegetable oils are significantly employed in lubricating oil formulations due to its high flash point, high lubricity, low evaporation loss, renewability, biodegradability, and eco‐friendliness when compared to mineral oil. We investigated the performance of seven poly(alkyl lactate acrylate)s as viscosity modifiers in two vegetable oils, namely, coconut oil and sunflower oil, which differ in the percentage of polar compounds and degree of unsaturation. Poly(alkyl lactate acrylate)s having alkyl as hexyl to dodecyl group in different concentrations between 1 and 2 wt% were added to coconut and sunflower oil and parameters such as thickening power or Q factor, kinematic viscosity (μ), and viscosity index (VI) were calculated. The μ values at 40°C and 100°C of vegetable oils studied were lower than commercially available SAE20W40 engine oil, but the VI of coconut and sunflower oil was higher by about 22%. Value of Q factor higher than 1, indicated that these poly(alkyl lactate acrylate)s were VI improvers. VI increased with increase in the polymer concentration in both the vegetable oils. The length of the alkyl side chain of these polymers and the polarity of vegetable oil had predominant effect in determining the values of VI of vegetable oils. By using these polymer additives, VI was improved by 85.5% in coconut oil and by 61.7% in sunflower oil. Varying the concentration and alkyl group of these additives, one can largely modify the viscosity ranges enabling them to be used in different lubricating applications.

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Effect of Isoalkyl Lactates as Pendant Group on Poly(acrylic acid)

Cited by 11 publications

References 35 publications

RETRACTED: Evaluation of intercalation and interaction in in-situ polymerized PLA-HNT bionanocomposites

RETRACTED: Evaluation of intercalation and interaction in in-situ polymerized PLA-HNT bionanocomposites

Photoinduced Upgrading of Lactic Acid-Based Solvents to Block Copolymer Surfactants

Performance of higher poly(alkyl lactate acrylate)s as viscosity modifiers in vegetable oils

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