Thermal and photostabilization behaviour of a novel naphthalene-HALS derivative in HDPE and PP films

• Published in: Polymer degradation and stability Vol. 64; no. 1; pp. 49 - 54
• Main Authors: Acosta Ortiz, Ricardo, Esquivel Lara, Alejandro, Allen, Norman S.
• Format: Journal Article
• Language: English
• Published: Oxford Elsevier Ltd 01.01.1999; Elsevier Science
• Subjects: Aging of materials; Applied sciences; Composition effects; Compounding ingredients; Exact sciences and technology; High density polyethylenes; Luminescence; Naphthalene; Naphthalene-HALS derivatives; Nitrogen compounds; Photochemical reactions; Photostabilization; Polymer industry, paints, wood; Polyolefins; Polypropylenes; Stabilizers (agents); Stabilizers (antioxydants, antiozonants, etc.); Synthesis (chemical); Technology of polymers; Thermal stabilization; Thermodynamic stability; Naphthalene-HALS derivatives; Thermal stabilization; Photostabilization; Luminescence; Polyolefins; Performance evaluation; Thermal ageing; Propylene polymer; High density ethylene polymer; Thermooxidative degradation; Experimental study; Naphthalene derivatives; Additive; Stabilizer agent; Concentration effect; Piperidine derivatives; Artificial ageing; Light stabiliser; Mechanism of action; Secondary amine; Photochemical degradation
• ISSN: 0141-3910; 1873-2321
• DOI: 10.1016/S0141-3910(98)00170-0

A novel N-[-8-(2-naphthoxy)Octyl]-4-amino,2,2,6,6-tetramethylpiperidine stabiliser has been synthesised and characterised and its thermal and photostabilising performance examined in both high density polyethylene and polypropylene films. Its performance has been compared with that of a commercial hindered piperidine light stabiliser, Tinuvin 770 together with the effects of naphthalene. Using FTIR analysis, the naphthoxy-HALS showed excellent properties as a thermal and photostabiliser, showing strong autosynergism in the former case. Comparisons with Tinuvin 770, showed that the naphthalenic moiety of the molecule plays a role in the thermal stabilization process by scavenging oxygen. Naphthalene itself exhibited some degree of thermal stabilization and reversed its behaviour from being a weak stabilizer at low concentrations to a prooxidant at higher concentrations. The same pattern of stabilization was observed during the photoaging of polypropylene with the exception of the mixture of Tinuvin 770 and naphthalene which was found to exhibit the best performance at the higher concentration.