Thermal decomposition of poly(propylene carbonate): End-capping, additives, and solvent effects

Phillips, Oluwadamilola; Schwartz, Jared M.; Kohl, Paul A.

doi:10.1016/j.polymdegradstab.2016.01.004

Cited by 74 publications

(47 citation statements)

References 33 publications

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“…PPC polyol decomposes by two mechanisms, end-unzipping (or sometimes called backbiting) which occurs first at a lower temperature, and random chain scission which usually occurs at a higher temperature. 29 The onset of thermal degradation of aPPC was similar to that of PPC polyol. However, the degradation process was completed at a slightly higher temperature because the allyl chloroformate stabilized the ends of the PPC polyol.…”

Section: Resultsmentioning

confidence: 79%

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Grafted Epoxide Functionalized Polypropylene Carbonate Porogen for Low Dielectric Constant Epoxy Films

Jiang

Phillips

Keller

et al. 2017

ECS J. Solid State Sci. Technol.

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A nanoporous epoxy film was formulated by using chemically modified epoxide-terminated polypropylene carbonate (ePPC) as the porogen in an epoxy resin formulation. The ePPC was grafted onto styrene maleic anhydride (SMA) copolymer and further used to chemically crosslink with poly(bisphenol A diglycidyl ether) (pBPADGE). The SMA-pBPADGE crosslinking was initiated with a tertiary amine catalyst. After curing of the pBPADGE resin film, the ePPC was thermally decomposed and created volatile, small molecules that diffused through the film leaving a nanoporous epoxy film. The pore size distribution within the epoxy film with ePPC loadings of 5 to 20 wt% after thermal degradation of the porogen was mostly between 6 to 18 nm as measured by nitrogen absorption experiments. The dielectric constant of the resulting 20% porous epoxy film was 2.77 and dielectric loss of 0.015. Mechanical properties and glass transition temperature of the cured film decreased slightly compared to the same film without pores. The reduced modulus of the epoxy film with 20% pore volume was 8 GPa and the glass transition temperature of 142 • C.

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Section: Resultsmentioning

confidence: 79%

“…29,30 In this study, it has been shown that nanoporous epoxy resins can be formed by first grafting the epoxide functionalized PPC polyol to a polymer backbone before thermal curing with the epoxy resin. Selective decomposition of the functionalized PPC polyol leads to the formation of low dielectric constant nanoporous epoxy films.…”

mentioning

confidence: 99%

Grafted Epoxide Functionalized Polypropylene Carbonate Porogen for Low Dielectric Constant Epoxy Films

Jiang

Phillips

Keller

et al. 2017

ECS J. Solid State Sci. Technol.

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“…In the PUR-3 spectrum, the peak at 17.1, 73.1, and 74.6 ppm were attributed to the carbon of methyl, methylene, and methane in PPC end-capped with propylene oxide segment (27). The peak at 153.7 ppm corresponds to the carbonyl carbon of the PPC (28). In the PUR-4 spectrum, the peak at around 70.6 ppm, which is ascribed to the methyleneoxy, methylene and methine carbon groups attached on the bio-PTMEG and PPC (29).…”

Section: Solid-state 13 C Nmr Analysismentioning

confidence: 99%

Synthesis, characterization and properties of biomass and carbon dioxide derived polyurethane reactive hot-melt adhesives

2019

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Polyurethane reactive hot-melt adhesives (PURHs) are frequently employed in industries; however, there is still a need to develop more sustainable and versatile methodologies to expand the functions and fabrication of these important materials. Renewable feedstock can give PURHs with new functions, and reduce environmental impact. This study focuses on synthesizing PURHs using polyols derived from biomass (plants) and greenhouse gas (CO 2 ) resources. These PURHs were characterized by multiple techniques, including solid-state 13 C nuclear magnetic resonance (NMR), a dynamic mechanical analysis (DMA), single-lap adhesive joints strength of stainless steel, and hydrolytic ageing. The PURH film based on biomass poly(tetramethylene ether) glycol (bio-PTMEG) exhibited better water vapor permeability, tensile strength, and adhesive joints properties than PURHs based on cashew nutshell liquid (CNSL) polyester diol and poly(propylene carbonate)-poly(propylene glycol) (PPC-PPG) copolymer diol. The polyols blend of bio-PTMEG with biomass and CO 2 based polycarbonate diols respectively provided PURHs films excellent hydrolysis resistance and adhesive strength on single-lap adhesively bonded stainless steel specimens. The work herein demonstrates that various renewable polyols can be employed in a sustainable fashion to optimize the structures and properties of PURHs for important applications.Abstract: Let F denote a eld and let V denote a vector space over F with nite positive a pair A, A * of diagonalizable F-linear maps on V, each of which acts on an eigenbasis irreducible tridiagonal fashion. Such a pair is called a Leonard pair. We consider the s there exists an automorphism of the endomorphism algebra of V that swaps A and A * . S is unique, and called the duality A ↔ A * . In the present paper we give a comprehens duality. In particular, we display an invertible F-linear map T on V such that the map X → A ↔ A * . We express T as a polynomial in A and A * . We describe how T acts on ag and 24 bases for V.

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“…7 . The heatproofing effect of nondeteriorated lignin on PEC is extremely one relative to other additive to carbonate-type polymer for protection against thermal degradation, e.g., citric acid 53 . The heatproof properties of non-deteriorated lignin appear to be superior to those reported previously for a lignin-based heatproof filler, for which only a small increase in decomposition temperature was achieved even when several tens w/w lignin derivative was added 54 57 .…”

Section: Unique Function Of Lignin Extracted By Sesc As Anmentioning

confidence: 99%

Utilization of Lignocellulosic Biomass via Novel Sustainable Process

et al. 2018

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Thermal decomposition of poly(propylene carbonate): End-capping, additives, and solvent effects

Cited by 74 publications

References 33 publications

Grafted Epoxide Functionalized Polypropylene Carbonate Porogen for Low Dielectric Constant Epoxy Films

Grafted Epoxide Functionalized Polypropylene Carbonate Porogen for Low Dielectric Constant Epoxy Films

Synthesis, characterization and properties of biomass and carbon dioxide derived polyurethane reactive hot-melt adhesives

Utilization of Lignocellulosic Biomass via Novel Sustainable Process

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