Effect of phthalic anhydride‐based hyperbranched polyesteramide on cement characteristics

Abstract

Hyperbranched polyesteramides (HB 1 and HB 2 ) were prepared by the bulk reaction between phthalic anhydride (PhAn) with either diisopropanolamine (DiPA) or diethanolamine (DEA), respectively. The hyperbranched polyesteramides were characterized by IR, GPC, 1 H-NMR, and thermal analysis (TGA and DSC). The effects of solutions of 1, 3, and 5 wt % HB 1 and HB 2 on the properties of Ordinary Portland Cement (OPC) and Portland Limestone Cement (PLC) were studied. Measurements of water of consistency, setting times, bulk density, apparent porosity, and compressive strength for the cement pastes were performed. Some selected cement pastes were characterized by IR and SEM photos. The results showed that HB 1 and HB 2 slightly increased the compressive strength, the combined water and density while decreased the apparent porosity. IR of the formed phases showed increase in the intensities of the spectra for the cement pastes mixed with HB 1 and HB 2 when compared with those of the blank cement pastes. SEM images showed that the incorporation of HB 1 and HB 2 affected only shape or morphology and crystallinity of the formed hydrates.

Modification of cement with succinic anhydride‐based hyperbranched polyesteramide

“…The prepared polymers and the formed polymer/cement pastes were characterized by using different techniques such as Infrared spectra (IR), Gel permeation chromatography (GPC), Nuclear magnetic resonance ( 1 HNMR), and scanning electron microscopy (SEM) 6, 7. The standard water of consistency as well as the setting times (initial and final) of the cement pastes were directly determined by Vicat apparatus 12, 13.…”

“…The standard water of consistency as well as the setting times (initial and final) of the cement pastes were directly determined by Vicat apparatus 12, 13. Bulk density (BD) and apparent porosity (A.P) of the hardened cement pastes were calculated from equations 1 and 2, respectively:14, 6, 7 …”

“…Compressive strength of the hardened cement pastes was measured by using a hydraulic testing machine LPM 600 M1 SEIDNER (Germany) having a full capacity of 600 KN 15, 6, 7…”

“…HYP 1 and HYP 2 were prepared as previously described in the literature,15, 16 and as mentioned in our publications,6, 7 as in the following: A mixture of (DiPA or DEA) and ScAn with a molar ratio for (DiPA or DEA)/ ScAn of 1.15/1 was introduced into three‐necked flask placed into thermostated oil bath and equipped with a mechanical stirrer and a vacuum pump. The reaction mixture was gradually heated to 170°C, with continuous stirring.…”

“…The two hyperbranched polyesteramides, HYP 1 and HYP 2 were added to OPC and PLC by dissolving them in the mixing water with the dosages of 0, 1, 3, and 5 wt % and the cement pastes were processed as published in our previous communications 6, 7…”