Robust, Thermally Stable and Impurity-Tolerant Aluminum-Based Catalyst System for Polylactide Production under Industrial Conditions DOI Creative Commons

Ze-Bin Wang,

Mingqian Wang,

Zhiqiang Ding

и другие.

Polymer science & technology., Год журнала: 2024, Номер unknown

Опубликована: Дек. 4, 2024

Ring-opening polymerization of l-lactide (l-LA) is a powerful approach that leverages renewable monomer to generate high-molecular-weight polylactide (PLA). It essential replace the industrially used cytotoxic tin(II) bis(2-ethylhexanoate) [Sn(Oct)2] with low/nontoxic alternatives. However, most benign catalysts addressed solution polymerizations are typically performed at 25–100 °C. Robust, thermally stable and protonic agent-tolerant for industrial PLA production still lacking. Herein, we designed synthesized tetracoordinate aluminum methyl complexes bearing (amidoalkyl)pyridine–phenolate (AmPyPh) pincers l-LA polymerizations. The catalytic activity could be modulated by electronic steric effects substituents in different positions. structure–catalytic performance relationships were further investigated assistance density functional theory calculations. These (AmPyPh)AlMe effectively promote under industrial-relevant conditions (150–180 °C, melt bulk). novel Al suppress epimerization side reaction harsh afforded semicrystalline PLLA. molecular weight monomer/catalyst feed ratio loading dosage chain transfer agent. showed comparable Sn(Oct)2 presence 20 equiv benzyl alcohol but exhibited much higher degree control over PLLA narrower distribution. Technical grade without purification also polymerized rapidly thanks good tolerance agents high temperature.

Язык: Английский

Rapid Microwave-Assisted Chemical Recycling of Poly(p-Phenylene Terephthalamide) DOI Creative Commons
Joël Benninga,

B. Gebben,

Rudy Folkersma

и другие.

Journal of the American Chemical Society, Год журнала: 2025, Номер 147(9), С. 7191 - 7195

Опубликована: Фев. 21, 2025

Back-to-monomer chemical recycling of polymers is crucial in achieving a circular plastics economy. Herein, we report the rapid microwave-assisted depolymerization poly(p-phenylene terephthalamide) (PPTA), also known as Twaron or Kevlar. The alkaline hydrolysis PPTA was conducted microwave reactor at temperatures ranging from 240 to 260 °C with reaction times 1-15 min. highest conversion (96%) found after 15 min °C. resulting monomers terephthalic acid and p-phenylenediamine were successfully purified (>99% purity) good yields using extraction precipitation methods. This work presents fastest date under relatively mild conditions, thereby encouraging value chain for PPTA.

Язык: Английский

Процитировано

1
Zinc-Oxide-Supported Zeolite Subcrystal Catalyst: Enhancing Chemical Recycling of Poly(lactic acid) via Optimized Active Site Dispersion and Polymer Diffusion DOI
Ling Ding,

Di Pan,

Ke Du

и другие.

ACS Sustainable Chemistry & Engineering, Год журнала: 2025, Номер unknown

Опубликована: Май 2, 2025

Язык: Английский

Процитировано

0
Hydrogen-Bond-Network-Driven Biodegradable PLA Elastomer with High Strength and Toughness DOI

Yuzhu Zhai,

Sidra Ghaffar,

Yongxin Zhao

и другие.

ACS Applied Polymer Materials, Год журнала: 2025, Номер unknown

Опубликована: Апрель 21, 2025

Язык: Английский

Процитировано

0
Polyester transesterification through reactive blending and its applications: a comprehensive review DOI

W.H. Leung,

Erin M. Leitao, Casparus J. R. Verbeek

и другие.

Polymer, Год журнала: 2025, Номер unknown, С. 128488 - 128488

Опубликована: Май 1, 2025

Язык: Английский

Процитировано

0
Robust, Thermally Stable and Impurity-Tolerant Aluminum-Based Catalyst System for Polylactide Production under Industrial Conditions DOI Creative Commons

Ze-Bin Wang,

Mingqian Wang,

Zhiqiang Ding

и другие.

Polymer science & technology., Год журнала: 2024, Номер unknown

Опубликована: Дек. 4, 2024

Ring-opening polymerization of l-lactide (l-LA) is a powerful approach that leverages renewable monomer to generate high-molecular-weight polylactide (PLA). It essential replace the industrially used cytotoxic tin(II) bis(2-ethylhexanoate) [Sn(Oct)2] with low/nontoxic alternatives. However, most benign catalysts addressed solution polymerizations are typically performed at 25–100 °C. Robust, thermally stable and protonic agent-tolerant for industrial PLA production still lacking. Herein, we designed synthesized tetracoordinate aluminum methyl complexes bearing (amidoalkyl)pyridine–phenolate (AmPyPh) pincers l-LA polymerizations. The catalytic activity could be modulated by electronic steric effects substituents in different positions. structure–catalytic performance relationships were further investigated assistance density functional theory calculations. These (AmPyPh)AlMe effectively promote under industrial-relevant conditions (150–180 °C, melt bulk). novel Al suppress epimerization side reaction harsh afforded semicrystalline PLLA. molecular weight monomer/catalyst feed ratio loading dosage chain transfer agent. showed comparable Sn(Oct)2 presence 20 equiv benzyl alcohol but exhibited much higher degree control over PLLA narrower distribution. Technical grade without purification also polymerized rapidly thanks good tolerance agents high temperature.

Язык: Английский

Процитировано

1