Synthesis of urethane acrylate from PENTA based polyol and EB curing with varying ratio of TMTPA

Abstract

Purpose -Urethane Acrylate Oligomer with 100% solids was synthesised and characterised in order to study the application in electron beam curing with varying ratio of Trimethylol propane triacrylate (TMPTA). The purpose of this paper is to study effect of TMPTA addition on the crosslink density and different coating properties. Design/methodology/approach -Polyester polyol was synthesised by reacting single diacid, adipic acid (AA), with Pentaerythritol (PENTA) and 1,6-hexanediol (HD). Further, Urethane acrylate resin was synthesised by using Isophorone diisocyanate (IPDI), hydroxy ethyl acrylate (HEA) and Polyester polyol. The polyester polyol and urethane acrylate oligomer were characterised by 1H NMR, 13C NMR, FTIR and GPC. Further, TMPTA was added as a crosslinker to the urethane acrylate oligomer and cured by electron beam radiation. The cured UA films having varying concentration of TMPTA were employed to evaluate thermal property, contact angle analysis, mechanical and chemical properties. Findings -The obtained results showed improvement in their chemical properties, mechanical properties, thermal properties and water contact angle at 20% of TMPTA iconcentration. The TMPTA also reduced the dose required for the curing.Research limitations/implications -The resin can be synthesised from different isocyanates as TDI, MDI and HMDI, etc. The study can also be done with different multi or mono functional monomers such as methacrylate, hexanediol diacrylate, ethylene glycol diacrylate, etc. Practical implications -The paper provides the better solution to reduce the cost of the electron beam radiation required for the curing. Social implications -The method presented in the paper could be very useful for controlling environmental pollution; as the conventional method of curing releases volatile organic compounds (VOC). Originality/value -In this paper, urethane acrylate and TMTPA cured with electron beam are shown to offer good coating properties. A high-solid urethane acrylate coating would find numerous industrial applications in surface coatings.

Synthesis of post‐modified poly(ester‐amino) microspheres via aza‐Michael precipitation polymerization and its use for enzyme immobilization

“…There is a new peak at 29.60 ppm associated to new formed OCC (C10) after aza‐Michael addition, and another peak of new formed carbon CNC (C9) is overlapped with that of C8 leading to a broad peak at this area. It is worth pointing out that two weak but well‐defined signals are observed at 132.42 and 126.64 ppm, which are assigned to the CC group on acrylate of the TMPTA monomer 37,38 . The 13 C NMR results provide direct evidence for the presence of unreacted acrylate groups in the resultant PEA particles, which is in good agreement with the FTIR result.…”

Hydrophobic chitosan/salicylic acid blends film with excellent tensile properties for degradable food packaging plastic materials

“…The contact angle slightly increased with increasing SA content, possibly because (1) the CS amino groups were replaced by the hydrophobic SA moieties, which decreased the number of exposed hydrophilic groups, 45 and (2) the more compact structure held less water, which resulted in a lower swelling extent 46 . In addition, at the same SA content, cross‐linked films had higher water contact angles than non‐cross‐linked ones, which indicated that the composite OH groups were consumed via cross‐linking to afford denser and more compact surfaces 47 …”

“…46 In addition, at the same SA content, cross-linked films had higher water contact angles than non-cross-linked ones, which indicated that the composite OH groups were consumed via cross-linking to afford denser and more compact surfaces. 47 Figure 2b presents the solubility of CS, CS-g-SA (3), and MDI@CS-g-SA (3) films in various solvents arranged according to their polarity (left: high polarity, right: low polarity). The strong intra-molecular hydrogen bonding between the hydroxyl and amino groups of CS endows pure CS with a crystalline structure, and thus renders it poorly soluble in water and organic reagents.…”

Upcycling polyethylene terephthalate wastes for enhancing the performance of polyester from rice straw polyol in HDPE-composites

“…The signal at 4.085 ppm referred to the CH 2 –O (C=O) proton, while the signal at 2.315 ppm referred to CH 2 –O (C=O). Due to protons CH 2 –CH 2 –O–(C=O), the signal at 1.62 ppm appears 30 . In the case of 1 H NMR of polyester from the glycolysis product of WPET, Fig.…”