Structure-property relationships of Cassava starch-acrylamide gel copolymerized by Gamma irradiation

Rekso, Gatot Trimulyadi; Rahmawati, Rahmawati

doi:10.1063/5.0072727

Cited by 2 publications

(5 citation statements)

References 10 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…The shift and sharper peak shape are thought to be due to the stretching of C=O bonds from starch that appears other than acrylamide in the copolymer. At wave numbers, 1699 cm-1, 1626 cm -1 , and 1354 cm -1 indicated the presence of C=O stretching, N-H bending, and C-N stretching, respectively, and indicated the -CONH2 group [4]. In the spectrum at wave numbers around 900 cm-1 and 1050 cm -1 , there is a reduction between before radiation and after radiation.…”

Section: Determination Of Slow Releasementioning

confidence: 96%

“…In this case, it shows the existence of hydrogen bonds that occur between N-H derived from acrylamide and -OH derived from starch and also PVA with each other. In addition, it can also show -OH stretching of the intra and intermolecular hydrogen bonds between starch and PVA or also of free -NH on acrylamide and free -OH on PVA and starch [4]. Then there was a shift in the wave number from 1611 cm -1 to 1626 cm -1 and an increase in the intensity at wave number 1626. cm-1.…”

Section: Determination Of Slow Releasementioning

confidence: 98%

“…starch-PVA-AAm-oligo-chitosan [4] First, the starch is added to the acrylamide solution little by little while stirring. Then the mixture of these solutions was added to a solution of polyvinyl alcohol (PVA), acrylamide, and chitosan, stirred, and heated at 90oC for 1 hour.…”

Section: Preparation Of Copolymer Coating Material-mentioning

confidence: 99%

See 2 more Smart Citations

Comparative effect of polymer coating materials on physical properties of NPK fertilizer pellet

Trimulyadi Rekso

2023

BIO Web Conf.

View full text Add to dashboard Cite

Slow-release fertilizer is one method to reduce the rate of loss of fertilizer from the soil due to leaching by rainwater or irrigation water. One of the agents that can be used for slow-release fertilizers is polymeric materials coated on NPK fertilizers. The NPK fertilizer coating polymer material used was a mixture of starch, acrylamide, PVA, and chitosan that was formulated and irradiated at a dose of 20 kGy. The purpose of this study was to obtain the best comparison between coating materials and NPK fertilizers made with a pelletizer machine. NPK fertilizer is mashed and mixed with polymer coating material with a weight ratio of NPK coating material/fertilizer; 1/9, 2/8, and 3/7. The results obtained showed the largest pellet yield capacity using a ratio of coating material and NPK fertilizer with a weight ratio of 1/9 of 4.28 g/minute and the greatest durability value at a ratio of 3/7 with a value of 87.1%. NPK released in NPK fertilizer coated with a polymer coating and fertilizer in a ratio of 1/9, 2/8, and 3/7 resulted in the release of NPK with not too big a difference. In the analysis of the functional group by FTIR between non-irradiated formulation and irradiated 20 kGy, there was no addition or change of molecular structure in the functional group. whereas thermal analysis with DSC displayed endotherm at temperature 500C to 1200C and exotherm at temperature 2500C until 3200C for analysis of TGA degradation of the formulation is divided into 2 phases, in the first phase degradation begins at a temperature of 500C to 1500C losing weight of 5% and in the second phase of degradation at 2500C to 5000C losing weighs 47%

show abstract

Section: Determination Of Slow Releasementioning

confidence: 96%

Section: Determination Of Slow Releasementioning

confidence: 98%

See 1 more Smart Citation

Comparative effect of polymer coating materials on physical properties of NPK fertilizer pellet

Trimulyadi Rekso

2023

BIO Web Conf.

View full text Add to dashboard Cite

show abstract

“…Thermogravimetric analysis was performed to examine the thermal stability of cellulose and C-g-PAA/FA, as presented in figure 2. It can be seen that below 200 o C, both samples are thermally stable with less than 10% weight loss owing to evaporation of moisture or physically bound water [8,14]. As the temperature increase, a significant weight loss takes place due to the functional group cleavage and decarboxylation reaction.…”

Section: Thermal Analysismentioning

confidence: 98%

“…Moreover, the functionalization or graft polymerization can be initiated by chemical, photochemical, enzymatic, plasma-induced, or high-energy ionizing radiation methods [12]. Among the abovementioned methods, grafting by high-energy ionizing radiation provides advantages including the fast, clean, and ease of preparation process [13][14][15].…”

Section: Introductionmentioning

confidence: 99%

Cellulose-g-poly (acrylic acid) interpenetrated by fulvic acid for potential Cu (II) removal from wastewater

Rahmawati,

Ekawati,

Yunus

et al. 2023

IOP Conf. Ser.: Earth Environ. Sci.

View full text Add to dashboard Cite

The cellulose-g-poly (acrylic acid) copolymer preparation in the presence of fulvic acid as an interpenetrating agent (C-g-PAA/FA) has been successfully conducted using gamma radiation. The acrylic acid was utilized as a functional monomer and N, N’-methylene bisacrylamide was used as a crosslinking agent. The fulvic acid addition to C-g-PAA was intended to enhance the number of functional groups responsible for the chelating agent. The infrared spectra of the obtained copolymer verified the incorporation of fulvic acid and acrylic acid in the cellulose network structure by the appearance of phenyl vibration and changes in the carbonyl vibration at 1560 and 1725 cm−1, respectively. Moreover, the thermogravimetric analysis showed that the C-g-PAA/FA increased the thermal resistance of the cellulose structure, which could be explained by the formation of robust and more chemical bonds that contributed to the network structure. Scanning electron microscope images revealed that the C-g-PAA/FA possesses a more compact and stronger network structure compared to pristine cellulose. Energy-dispersive X-ray analysis confirmed the presence of copper ions on the surface of C-g-PAA/FA after Cu (II) removal. In addition, the C-g-PAA/FA has effectively been used as Cu (II) removal in the aqueous solution, with a removal percentage of up to 56 %.

show abstract

Structure-property relationships of Cassava starch-acrylamide gel copolymerized by Gamma irradiation

Cited by 2 publications

References 10 publications

Comparative effect of polymer coating materials on physical properties of NPK fertilizer pellet

Comparative effect of polymer coating materials on physical properties of NPK fertilizer pellet

Cellulose-g-poly (acrylic acid) interpenetrated by fulvic acid for potential Cu (II) removal from wastewater

Contact Info

Product

Resources

About