Thermal analysis of carboxyl-modified cobalt and calcium metal phthalocyanine pigments

Nuritdinov, Abdullazizbek

Наманган муҳандислик­технология институти илмий­техника журнали · 2025-yil

Annotatsiya

In this study, the thermal behavior of the carboxyl-functionalized phthalocyanine pigment containing cobalt/calcium metal centers was investigated using TG/DTA techniques in the temperature range of 25–700 °C. The thermogravimetric (TG) curve revealed a two-stage decomposition pattern. The first mass-loss event, occurring between 18.47 and 326.94 °C, accounted for 1.828 mg (52.909%) and corresponds to the removal of physically adsorbed moisture, residual solvents, and the initial decarboxylation of the modified phthalocyanine framework. The second stage, observed within 326.94–701.09 °C, resulted in an additional mass loss of 0.929 mg (26.889%) and is attributed to the progressive breakdown of the macrocyclic aromatic structure. The DTA thermogram exhibited a pronounced endothermic peak at 217.25 °C, associated with carboxyl group detachment and structural rearrangements, followed by a strong exothermic peak at 613.58 °C, indicating deep oxidative degradation of the phthalocyanine macrocycle. These results collectively confirm that the pigment undergoes primary decomposition related to its carboxyl functionalities, followed by extensive aromatic degradation at higher temperatures. Overall, the obtained TG/DTA profiles demonstrate that the modified metal phthalocyanine pigment possesses high thermal stability, maintaining significant structural integrity even above 600 °C, which is a favorable characteristic for applications requiring enhanced heat resistance.

Maqola ma’lumotlari
MualliflarNuritdinov, Abdullazizbek
JurnalНаманган муҳандислик­технология институти илмий­техника журнали
NashriyotНаманган муҳандислик-технология институти
ISSN2181-8622, 1682-8658
Nashr sanasi2025-12-30
Jild10
Son4
Betlar162-167
TilIngliz
DOI10.61151/stjniet.v10i4.931
Indeksga qo‘shilgan2026-08-26

DOI: 10.61151/stjniet.v10i4.931 · Maqolaning asl sahifasi

Kalit so‘zlar

phthalocyanine, cobalt phthalocyanine, calcium phthalocyanine, thermal analysis, TG/DTA, carboxyl modification

Iqtibos keltirish

APANuritdinov, Abdullazizbek (2025). THERMAL ANALYSIS OF CARBOXYL-MODIFIED COBALT AND CALCIUM METAL PHTHALOCYANINE PIGMENTS. Наманган муҳандислик­технология институти илмий­техника журнали, 10(4), 162-167. https://doi.org/10.61151/stjniet.v10i4.931
GOST (OAK)Nuritdinov, Abdullazizbek THERMAL ANALYSIS OF CARBOXYL-MODIFIED COBALT AND CALCIUM METAL PHTHALOCYANINE PIGMENTS // Наманган муҳандислик­технология институти илмий­техника журнали. – 2025. – T. 10, № 4. – P. 162-167. – DOI: 10.61151/stjniet.v10i4.931.
MLANuritdinov, Abdullazizbek. “THERMAL ANALYSIS OF CARBOXYL-MODIFIED COBALT AND CALCIUM METAL PHTHALOCYANINE PIGMENTS.” Наманган муҳандислик­технология институти илмий­техника журнали, 10(4), 162-167, 2025. https://doi.org/10.61151/stjniet.v10i4.931
ChicagoNuritdinov, Abdullazizbek. “THERMAL ANALYSIS OF CARBOXYL-MODIFIED COBALT AND CALCIUM METAL PHTHALOCYANINE PIGMENTS.” Наманган муҳандислик­технология институти илмий­техника журнали, 10(4), 162-167 (2025). https://doi.org/10.61151/stjniet.v10i4.931
HarvardNuritdinov, Abdullazizbek (2025) ‘THERMAL ANALYSIS OF CARBOXYL-MODIFIED COBALT AND CALCIUM METAL PHTHALOCYANINE PIGMENTS’, Наманган муҳандислик­технология институти илмий­техника журнали, 10(4), 162-167. https://doi.org/10.61151/stjniet.v10i4.931
BibTeX
@article{nuritdinovabdullazizbek2025,
  title = {THERMAL ANALYSIS OF CARBOXYL-MODIFIED COBALT AND CALCIUM METAL PHTHALOCYANINE PIGMENTS},
  author = {Nuritdinov, Abdullazizbek},
  journal = {Наманган муҳандислик­технология институти илмий­техника журнали},
  year = {2025},
  volume = {10},
  number = {4},
  pages = {162-167},
  doi = {10.61151/stjniet.v10i4.931},
  url = {https://doi.org/10.61151/stjniet.v10i4.931}
}

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