Open AccessEffect of NaBr on the Structural, Thermal and Mechanical Properties of HPMC:NaBr Composite Films
Author(s) -
Sunil Kumar,
S. Raghu,
T. Demappa,
J. Sannappa
Publication year - 2022
Publication title -
asian journal of chemistry/asian journal of chemistry
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.145
H-Index - 34
eISSN - 0975-427X
pISSN - 0970-7077
DOI - 10.14233/ajchem.2022.23507
Subject(s) - chemistry , dopant , composite number , phase (matter) , microstructure , polymer , glass transition , salt (chemistry) , sodium bromide , chemical engineering , analytical chemistry (journal) , polymer chemistry , sodium , composite material , doping , chromatography , organic chemistry , materials science , crystallography , optoelectronics , engineering
The hydroxypropyl methylcellulose (HPMC):sodium bromide (NaBr) composite films were preparedusing different concentrations by solution casting method. The crystalline percentage of the pureHPMC was reduced from 74% to 60% upon the incorporation of 0.7 wt.% of NaBr salt, which suggeststhat the NaBr salt disrupted the host polymer crystalline phase. The two-phase microstructure in themorphological images reflects the phase separation at different concentrations of dopant. The functionalstudies revealed the considerable variation of intensity and the shift of peaks due to the action of NaBrin the host polymer matrix. The HPMC showed a large increase in the glass transition temperature(Tg) from 65 ºC to 86 ºC and simultaneously reduction in the weight percent loss was observed. Themechanical analysis revealed that the added dopant has a significant effect on the mechanical propertiesof HPMC.