Predictive models of poly(ethylene-terephthalate) film degradation under multi-factor accelerated weathering exposures.

ABSTRACT: Accelerated weathering exposures were performed on poly(ethylene-terephthalate) (PET) films. Longitudinal multi-level predictive models as a function of PET grades and exposure types were developed for the change in yellowness index (YI) and haze (%). Exposures with similar change in YI were modeled using a linear fixed-effects modeling approach. Due to the complex nature of haze formation, measurement uncertainty, and the differences in the samples' responses, the change in haze (%) depended on individual samples' responses and a linear mixed-effects modeling approach was used. When compared to fixed-effects models, the addition of random effects in the haze formation models significantly increased the variance explained. For both modeling approaches, diagnostic plots confirmed independen

SUBMITTER: Gok A 

PROVIDER: S-EPMC5428936 | biostudies-literature | 2017

REPOSITORIES: biostudies-literature