Mechanochemically Promoted Functionalization of Postconsumer Poly(Methyl Methacrylate) and Poly(α-Methylstyrene) for Bulk Depolymerization.

We describe a methodology of post-polymerization functionalization to enable subsequent bulk depolymerization to monomer by utilizing mechanochemical macro-radical generation. By harnessing ultrasonic chain-scission in the presence of N-hydroxyphthalimide methacrylate (PhthMA), we successfully chain-end functionalize polymers to promote subsequent depolymerization in bulk, achieving up to 81% depolymerization of poly(methyl methacrylate) (PMMA) and poly(α-methylstyrene) (PAMS) within 30 min. This method of depolymerization yields a high-purity monomer that can be repolymerized. Moreover, as compared to the most common methods of depolymerization, this work is most efficient with ultra-high molecular weight (UHMW) polymers, establishing a method with the potential to address highly persistent, non-degradable all-carbon backbone plastic materials. Lastly, we demonstrate the expansion of this depolymerization method to commercial cell cast PMMA, achieving high degrees of depolymerization from post-consumer waste. This work is the first demonstration of applying PhthMA-promoted depolymerization strategies in homopolymer PMMA and PAMS prepared by conventional polymerization methods.

Home Literacy Environment and Interventions for Children With Intellectual and Developmental Disabilities: A Scoping Review.

PURPOSE: The aim of this scoping review was to map the research literature published in English and in peer-reviewed journals related to the home literacy environment of children and youth aged 3-21 years with intellectual and developmental disabilities (IDD) who have significant support needs, including children with complex communication needs. METHOD: A systematic search was conducted in four databases, along with forward and backward searching. The search yielded 60 studies, which included intervention and nonintervention studies. Data were charted related to participant characteristics, study focus, intervention components, study design and methodological rigor, and study results. RESULTS: Findings provided insight into multiple dimensions of the home literacy environment for children with IDD, including the nature of parent views, practices, and interaction styles during shared reading. Findings also revealed gaps in the literature, specifically related to (a) limited representation of subgroups of children and youth with IDD, (b) limited representation of diverse families and caregivers, and (c) concerns about methodological quality. CONCLUSION: This review identifies important directions for future research and suggests ways to improve the design and delivery of home literacy interventions for children and youth with IDD and their families, including through family-centered and culturally responsive models. SUPPLEMENTAL MATERIAL: https://doi.org/10.23641/asha.22704817.