Structural and thermal behavior of comb‐like polymer having n‐octadecyl side chains

Abstract

The cocrystallization behavior of poly(n-octadecyl methacrylate) (POMA) and its blends with corresponding fatty acid (n-octadecanoic acid) (C 18 ) was explored by differential scanning calorimetry (DSC) and X-ray diffraction studies. The DSC curves for blended samples of POMA with C 18 show the characteristic melting endotherms that correspond to the melting of the cystallites. The existence of hexagonally packed crystalline lattice is confirmed from the X-ray diffraction studies. Thermal degradation of the polymer and its blend proceeds in a one-step reaction.

Thermal Annealing of High cis-1,4-Polybutadiene/Octadecyl Acrylate Blends as a One-Step Process for Fabricating Shape Memory Polymers

“…As [ODA]/[B] decreases, the ODA melting temperature decreases. The melting point depression is consistent with other comb-like polyacrylate and polymethacrylate copolymers having crystallizable n -octadecyl side chains, while the presence of a single melting peak is consistent with blends of poly( n -octadecyl acrylate) with n -octadecanoic acid and n -aliphatic hydrocarbons − due to the combined effects from the entropic gain of mixing the chemically different units, decreasing ODA concentration, and the co-crystallization of ODA with the PB- x ODA that regulates the crystal growth and thereby the melting temperature and the enthalpy of melting. The enthalpy of melting (Δ H m ) in kJ/mol of ODA was calculated as Δ H m false( kJ / mol 0.25em ODA false) = Δ H m false( normalJ / normalg false) M ODA w ODA ( 1000 ⁢ J / k J ) where w ODA is w ODA = false[ ODA false] M ODA false[ ODA false] M ODA + false[ normalB false] M B and is plotted in Figure c.…”

Fabrication and Performances of Microencapsulated n-Alkanes with Copolymers Having n-Octadecyl Side Chains As Shells

“…Comb-like polymers with crystallizable poly(n-alkyl) side chains attached to the amorphous main chain known to pack into small n-alkyl nanodomains with an alternating crystalline side chain region and amorphous main chain region in the solid state. 42 In general, the crystalline structures and thermal properties of copolymers that include side chain monomers are similar to those of the comb-like polymers from those side chain monomers. 43 Qiu et al fabricated n-octadecane containing microcapsules using a series of MMA-based copolymer as shells, in which butyl acrylate, butyl methacrylate, lauryl methacrylate, and octadecyl methacrylate (ODMA) were employed as comonomer.…”

“…These results enlighten a new approach to fabricate MicroPCMs with low supercooling by using copolymeric shell having long n -alkyl side chains as shell. Comb-like polymers with crystallizable poly( n -alkyl) side chains attached to the amorphous main chain known to pack into small n -alkyl nanodomains with an alternating crystalline side chain region and amorphous main chain region in the solid state . In general, the crystalline structures and thermal properties of copolymers that include side chain monomers are similar to those of the comb-like polymers from those side chain monomers .…”