Designing catechol‐end functionalized poly(DMAm‐<i>co</i>‐NIPAM) by RAFT with tunable LCSTs

Oyeneye, Olabode O.; Xu, William Z.; Charpentier, Paul A.

doi:10.1002/pola.28879

Cited by 7 publications

(5 citation statements)

References 46 publications

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“…This may possibly constitute a great impediment on output of rice in the study area. This is in line with the findings of (Oyeneye, 2017;Olorunniyi, et al, 2022) [31,25] , that majority of farmers, over 90 percent, have not adopted use machinery in their farming practices which could be as result of absolutely no availability or introduction.…”

Section: Adoption Of Rice Innovation By the Respondentssupporting

confidence: 89%

Adoption of agricultural innovations among rice farmers in federal capital territory, Nigeria

IL¹,

Chibuike²,

DN³

et al. 2022

Int. J. Agric. Extension Social Dev.

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The study accessed rice farmers' adoption of innovations in the Federal Capital Territory, Nigeria. The FCT has six area council; Abaji, kuje, Municipal, Kwali, Bwari and Gwagwalada. The study area covers a land mass of 8,000 kilometer (km2). It is bordered by four states Kaduna, Nassarawa, Kogi and Niger, it lies between latitude 80 251 and 90 251 North of the equator and longitudes 60 451 and 70 451 east of the Greenwich meridian. Abuja is located in the middle belt of Nigeria, its size is equivalent to 0.8% of Nigeria. There exist expansive fertile marshy plains good for rice production. The multistage sampling method was used to sample a total of 120 rice farmer using structured questionnaires as instruments in Gwagwalada council, 20 farm cells were selected, 6 farmers were then randomly selected from each cell. The data were analyzed using simple descriptive statistics. Most of the farmers (87.5%) were male. 6-11 persons (33.3%) per house-hold constituted the largest household size of the total farmers sampled. Majority of the farmers (26.76%) earned only between N21, 000 and N60, 000 annually. Adoption rate of some agricultural innovation in rice were rated as Fertilizer (60.2%), herbicides (60.2%), improved seed (30.8%), use of agricultural extension services (3.3%) use of farm machinery (2.1%) and silos (1.1%). Constraints faced by farmers in the study area were inadequate capital (80%), inadequate extension services (85.8%) poor market price (30.8%), high cost of agro chemicals (98.3%), inadequate storage and processing facilities (92.5%), No access to loans and credits (95.0%). The research recommended public private partnership (PPP) to sensitize and educate farmers to enable them benefit from the new innovations and technology that abound in rice farming.

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Section: Adoption Of Rice Innovation By the Respondentssupporting

confidence: 89%

Adoption of agricultural innovations among rice farmers in federal capital territory, Nigeria

IL¹,

Chibuike²,

DN³

et al. 2022

Int. J. Agric. Extension Social Dev.

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“…The catechol groups show a great versatility in terms of applications such as biosensors or biomedicine [12,13,14,15,16,17]. Moreover, the use of dopamine methacrylamide (DMA) as a comonomer is suitable due to its main chain structure being similar to N- isopropylacrylamide (NIPAM) [18].…”

Section: Introductionmentioning

confidence: 99%

Effect of Hydrophobic Interactions on Lower Critical Solution Temperature for Poly(N-isopropylacrylamide-co-dopamine Methacrylamide) Copolymers

et al. 2019

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For the preparation of thermoresponsive copolymers, for e.g., tissue engineering scaffolds or drug carriers, a precise control of the synthesis parameters to set the lower critical solution temperature (LCST) is required. However, the correlations between molecular parameters and LCST are partially unknown and, furthermore, LCST is defined as an exact temperature, which oversimplifies the real situation. Here, random N-isopropylacrylamide (NIPAM)/dopamine methacrylamide (DMA) copolymers were prepared under a systematical variation of molecular weight and comonomer amount and their LCST in water studied by calorimetry, turbidimetry, and rheology. Structural information was deduced from observed transitions clarifying the contributions of molecular weight, comonomer content, end-group effect or polymerization degree on LCST, which were then statistically modeled. This proved that the LCST can be predicted through molecular structure and conditions of the solutions. While the hydrophobic DMA lowers the LCST especially the onset, polymerization degree has an important but smaller influence over all the whole LCST range.

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“…Since Lee et al reported a method using dopamine to synthesize an adhesive film that could bond to a variety of materials including noble metals, oxides, polymers, and ceramics, 3 dopamine has been intensively studied for many applications such as the reduction of graphene oxide and functionalization of graphene 4,5 and with adhesive reversible addition-fragmentation chain transfer (RAFT) agents. 6,7 In order to produce a large quantity of the adhesives, Westwood et al synthesized poly(3,4-dihydroxystyrene-co-styrene) polymers by replacing the polyamide chain in mussel adhesive proteins with a polystyrene backbone while maintaining the key crosslinking functional group catechol found in 3,4-dihydroxyphenylalanine (DOPA). 8 Such synthetic copolymers demonstrated very high underwater bonding strength, being believed to be the strongest found to date.…”

Section: Introductionmentioning

confidence: 99%

“…Recent years have seen a growing interest in the research and development of biomimetic materials. , Shellfish such as mussels, barnacles, and oysters produce adhesive proteins for adhering to underwater rocks. Since Lee et al reported a method using dopamine to synthesize an adhesive film that could bond to a variety of materials including noble metals, oxides, polymers, and ceramics, dopamine has been intensively studied for many applications such as the reduction of graphene oxide and functionalization of graphene , and with adhesive reversible addition-fragmentation chain transfer (RAFT) agents. , In order to produce a large quantity of the adhesives, Westwood et al synthesized poly(3,4-dihydroxystyrene- co -styrene) polymers by replacing the polyamide chain in mussel adhesive proteins with a polystyrene backbone while maintaining the key cross-linking functional group catechol found in 3,4-dihydroxyphenylalanine (DOPA) . Such synthetic copolymers demonstrated very high underwater bonding strength, being believed to be the strongest found to date. , However, the adhesive performance of the synthesized poly(3,4-dihydroxystyrene- co -styrene) is dependent on the copolymer chain structure including the molecular weight as well as the 3,4-dihydroxystyrene sequence distribution and content .…”

Section: Introductionmentioning

confidence: 99%

In Situ NMR Measurement of Reactivity Ratios for the Copolymerization of 3,4-Dimethoxystyrene and para-Substituted Styrene

Kong

Charpentier

2023

Ind. Eng. Chem. Res.

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Poly(3,4-dimethoxystyrene-co-styrene) can be used as a precursor for the synthesis of underwater adhesives. The distribution of the comonomer segments in the copolymer chain is critical to the resulting performance of the adhesives. The present study examined the reactivity ratios for the copolymerization of 3,4-dimethoxystyrene and para-substituted styrene by using the Meyer–Lowry, Mayo–Lewis, and Kelen–Tüdös methods, where in situ 1H NMR was employed in monitoring the consumption profile of monomers. The effects of para-substitute groups, reaction temperature, and solvent on the reactivity ratios were studied. It was found that the para-substitute groups (H, methyl, and t-butyl) had little effect on the reactivity ratios for the copolymerization of 3,4-dimethoxystyrene and para-substituted styrene at 70 °C in toluene-d 8. A lower reactivity ratio for styrene was found in the copolymerization of styrene and 3,4-dimethoxystyrene in toluene-d 8 at a lower temperature of 60 °C than that at 70 and 80 °C. Although 3,4-dimethoxystyrene showed higher reactivity ratios than styrene under all the tested conditions, a nearly random copolymerization behavior was observed for the copolymerization of styrene and 3,4-dimethoxystyrene at 70 °C in the polar solvent DMSO-d 6. Based on the present study, it is recommended to carry out experiments covering a large range of monomer mole fraction in feed when measuring reactivity ratios regardless of the analytical methods.

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Designing catechol‐end functionalized poly(DMAm‐co‐NIPAM) by RAFT with tunable LCSTs

Cited by 7 publications

References 46 publications

Adoption of agricultural innovations among rice farmers in federal capital territory, Nigeria

Adoption of agricultural innovations among rice farmers in federal capital territory, Nigeria

Effect of Hydrophobic Interactions on Lower Critical Solution Temperature for Poly(N-isopropylacrylamide-co-dopamine Methacrylamide) Copolymers

In Situ NMR Measurement of Reactivity Ratios for the Copolymerization of 3,4-Dimethoxystyrene and para-Substituted Styrene

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