Preparation and characterization of a high molecular weight UV‐stabilizer based on a derivative of 2,4‐dihydroxybenzophenone and its application in polymer materials

Abstract

ABSTRACT:In this study, a polymerizable UV-stabilizer, 2-hydroxy-4-(3-methacryloxy-2-hydroxylpropoxy)benzophenone (BPMA), was synthesized using 2,4-dihydroxybenzophenone (UV-0) and glycidyl methacrylate (GMA). It was copolymerized with methyl methacrylate (MMA) to prepare poly(MMA-co-BPMA) by emulsion polymerization. The composition and characteristics of poly(MMA-co-BPMA) were determined by using proton nuclear magnetic resonance ( 1 H-NMR), gel permeation chromatography (GPC), and ultraviolet-visible absorption spectroscopy (UV-vis). Further, the obtained poly(MMA-co-BPMA) was used as a high molecular weight UV-stabilizer and was blended with PVC to prepare PVC/poly(MMA-co-BPMA) films. These films were presented under UV light, using PVC film as standard substance. Insoluble substance, GPC, and color difference were used to characterize UV degradation. The results show that poly(MMA-co-BPMA) is an effective high molecular weight UV-stabilizer. To detect the migration of poly(MMA-co-BPMA), water extraction and heat migration test were used to accelerate the movement of poly(MMAco-BPMA). As a reference, these tests were also carried out on PVC/UV-0 film. The results show that poly(MMA-co-BPMA) has very small migration, while nearly 80% UV-0 migrated out from the plastic matrix after the experiments.

Stability of Uv Stabilizers

“…69 The following structures can be used in polymerization: 69 A polymerizable UV-stabilizer, 2-hydroxy-4-(3-methacryloxy-2-hydroxylpropoxy)benzophenone, was synthesized using 2,4-dihydroxybenzophenone and glycidyl methacrylate, which was then copolymerized with methyl methacrylate by emulsion polymerization. 70 The polymer was an effective stabilizer of UV, which, in addition, was not removed by heat and water extraction. 70 The same method was used to polymerize benzophenone into styrenic polymers, which also improved stabilizing performance.…”

Studies on thermal stability and UV-resistant performance of poly(MMA-co-M12-co-BPMA)/TiO2 composite particles

“…The ultraviolet absorption spectra of poly(MMA-co-M12-co-BPMA) grafted from the surface of TiO 2 and the poly(MMA-co-M12) grafted from the surface of TiO 2 are shown in Figure 3. The curve (a) in Figure 3 shows absorption peaks of BPMA at 332 nm and 284 nm which are attributed to the n→π * transition and π→π* transition [14], respectively. From curve (d) to (a), the strength of absorption peaks at 332 nm and 284 nm increased with the increase in BPMA content.…”

“…The UV-stabilizer can thus be embedded in the PMMA chains by covalent bonding. And hence the migration and evaporation problems would be solved and the service life of the polymer materials would be prolonged [14][15].…”

Synthesis and Light-Stabilizing Ability of a Series of Hindered Piperidine Derivatives

“…In the past two decades, several HALSs containing 2,2,6,6-tetramethylpiperidine have been reported, such as polymeric HALS, [1][2][3][4][5][6][7][8][9][10][11] multifunctional HALS [11][12][13] and reactive HALS. [4] Chimassorb 944, as an excellent representative of polymer HALS, with a number average molecular weight of about 2000 to 3000, exhibited good thermal stability and resistance to extraction.…”