Article
Polymer Science
Finizia Auriemma, Christophe Daniel, Manohar Golla, Baku Nagendra, Paola Rizzo, Oreste Tarallo, Gaetano Guerra
Summary: This review focuses on relevant information about PPO crystallization, with a particular emphasis on nanoporous crystalline and co-crystalline forms. It discusses preparation methods, structures, properties, and applications of NC and CC samples, with a particular emphasis on the impressive solubility and diffusivity of organic guests in NC PPO samples. The study mainly examines films, especially axially oriented NC films, revealing their structural features and future research prospects.
Article
Chemistry, Inorganic & Nuclear
Mamina Bhol, Guilhem Claude, Maximilian Roca Jungfer, Ulrich Abram, Malaichamy Sathiyendiran
Summary: In this study, calix[4]arene-analogous technetium supramolecules and rhenium-based macrocycles were successfully assembled by using specific ligands and starting materials. The structures of these molecules were characterized in detail.
INORGANIC CHEMISTRY
(2022)
Article
Materials Science, Multidisciplinary
Do Kyun Kim, Seung Sang Hwang, Seunggun Yu
Summary: The design of PPE/PPS-based quaternary blends with increased impact strength was achieved through the introduction of reactive polystyrene (RPS) as a compatibilizer, which improved the miscibility between the discrete PPE domain and continuous PPS matrix phases, resulting in extraordinary impact strength without significant loss of mechanical and flame-retardant properties.
MATERIALS CHEMISTRY AND PHYSICS
(2021)
Article
Polymer Science
Salman Syed, Baku Nagendra, Antonietta Cozzolino, Maria Rosaria Acocella, Christophe Daniel, Paola Rizzo, Gaetano Guerra
Summary: Nanoporous-crystalline (NC) alpha and beta forms of Poly(2,6-dimethyl-1,4-phenylene) oxide (PPO) can include low-molecular-mass guests. The transitions between alpha and beta forms can be achieved by sorption of beta-guests and alpha-guests. The loss of crystalline phase orientation occurs during the transitions and is only observed for guests that are good PPO solvents.
EUROPEAN POLYMER JOURNAL
(2023)
Article
Polymer Science
Valerio Loianno, Antonio Baldanza, Giuseppe Scherillo, Pellegrino Musto, Giuseppe Mensitieri
Summary: The sorption of pure CO2, CH4, and CO2/CH4 binary gas mixtures in amorphous glassy PPO was studied at 35 degrees C up to 1000 Torr. A combination of barometry and FTIR spectroscopy in the transmission mode was used to measure the sorption of gases in polymers. The solubility of CO2 in the binary mixtures was found to be similar to that of pure CO2 up to a total pressure of 1000 Torr and for CO2 mole fractions of about 0.5 and 0.3. The NET-GP modeling approach was employed to fit the solubility data of pure gases and to predict the solubility of CO2/CH4 mixed gases in PPO, with a deviation of less than 9.5% from experimental results for CO2 solubility.
Article
Chemistry, Physical
Seong Jin An, Ji Eun Kim, Somi Yu, Ki Jung Kim, Minjoong Kim, Jong Hak Kim, Jae Hun Lee, Won Seok Chi
Summary: In this study, a uniformly blended membrane was fabricated by incorporating chloromethylated triptycene and brominated poly(2,6-dimethyl-1,4-phenylene oxide) (BPPO). The dual-quaternized BPPO/triptycene-Cl blended membrane showed enhanced hydroxide ion conductivity and improved water electrolyzer cell performance compared to a commercial membrane. The dimensional stability of the blended membrane was effectively controlled, despite high water uptake, due to the increased free volume provided by the triptycene additive.
ACS APPLIED ENERGY MATERIALS
(2023)
Article
Polymer Science
Baku Nagendra, Manohar Golla, Christophe Daniel, Paola Rizzo, Gaetano Guerra
Summary: This study focuses on the melting behavior of nanoporous-crystalline (NC) and co-crystalline (CC) PPO films using differential scanning calorimetry. Results reveal that PPO films with c(//) orientation help establish melting temperatures of CC phases and achieve partially filled CC PPO films with lower melting temperatures through annealing. Molecular volumes suitable for guests of the alpha NC form of PPO are found to be in the range of 160-230 angstrom(3).
Article
Polymer Science
Yi-Fang Lu, Song-Hai Wu, Cong Wang, Yong Liu, Fu-Gen Huang, Bao-Dong Song, Xu Han
Summary: This study reports two methods for synthesizing low-molecular-weight poly(2,6-dimethyl-1,4-phenylene oxide) (LMW-PPO) using metal and non-metal catalysts. Cu(II) catalysts and peroxydisulfate (PDS) can produce high thermal stability and satisfactory dielectric properties of PPO. In the absence of Cu(II) catalysts, mesoporphyrin IX dihydrochloride or methylamine can catalyze PDS to produce metal-free LMW-PPO.
Article
Polymer Science
Baku Nagendra, Christophe Daniel, Paola Rizzo, Gaetano Guerra
Summary: Four different preparation methods for nanoporous-crystalline films of PPO with high crystallinity and high c-perpendicular orientation, even for thickness as low as 5 μm, are described in this paper. The results support the hypothesis that the c-perpendicular orientation is due to the formation of flat-on crystalline lamellae through nanoconfined co-crystallization of PPO. An anomalous temperature dependence of c-perpendicular orientation for limonene-induced co-crystallization with PPO is also explained.
POLYMERS FOR ADVANCED TECHNOLOGIES
(2022)
Article
Chemistry, Physical
Dengji Zhang, Shicheng Xu, Ruiying Wan, Yunfei Yang, Ronghuan He
Summary: Composite anion exchange membranes with superior conductivity are developed by cross-linking QPPO with NGO, showing low water uptake and swelling ratio, high ion conductivity and alkaline stability. The proposed composite membrane exhibits a hydroxide conductivity of 123 mS cm(-1) and retains a conductivity of 83 mS cm(-1) after immersion in KOH solution for 384 hours, outperforming pristine QPPO membrane.
JOURNAL OF POWER SOURCES
(2022)
Article
Engineering, Chemical
Junhua Li, Hao Qian, Junbin Liao, Yeyang Li, Jingwen Xu, Quan Chen, Yuyang Yao, Junjie Mu, Yanqing Xu, Huimin Ruan, Xiaoliang Xu, Jiangnan Shen
Summary: Amphoteric ion-exchange membranes have been prepared for ion separation in this study. The optimized membrane shows good separation performance and may provide guidance for the design of advanced ion-exchange membranes.
JOURNAL OF MEMBRANE SCIENCE
(2022)
Article
Engineering, Chemical
Zhiru Liu, Li Bai, Shasha Miao, Chao Li, Ji Pan, Yu Jin, Dongrui Chu, Xiaomeng Chu, Lei Liu
Summary: Steric hindrance engineering plays a crucial role in the preparation of stable organic cations and durable polymeric anion exchange membrane materials. The study found that PPO-iP membranes, containing isopropyl-based QA cations, exhibited higher water uptake and hydroxide conductivity compared to PPO-nP and PPO-CH membranes. Additionally, PPO-CH membranes showed superior alkaline stability in chemical stability tests, while significant degradation was observed in PPO-iP and PPO-nP membranes. Overall, the highly conductive PPO-iP membrane demonstrated promising performance in alkaline fuel cells.
JOURNAL OF MEMBRANE SCIENCE
(2021)
Article
Engineering, Chemical
Xiaomeng Chu, Shasha Miao, Andi Zhou, Shaojie Liu, Lei Liu, Nanwen Li
Summary: This study demonstrates a strategy to design stable and conductive anion exchange membrane (AEM) materials for alkaline fuel cells. The resulting AEM membranes show lower water uptake, higher conductivity, and better mechanical properties compared to traditional AEMs, addressing the limitations in their application.
JOURNAL OF MEMBRANE SCIENCE
(2022)
Article
Chemistry, Physical
Qian Liu, Zhe Wang, Aijun Yu, Jinsheng Li, Hongcheng Shen, Hui Wang, Kai Yang, Hongyu Zhang
Summary: A novel comb-shaped anion exchange membrane based on PPO and DABDA was reported in this study, showing excellent hydrophilic/hydrophobic microphase separation and alkaline stability. The increase in grafting degree led to improvements in water uptake, swelling ratio, conductivity, and mechanical properties of the membranes.
INTERNATIONAL JOURNAL OF HYDROGEN ENERGY
(2021)
Article
Chemistry, Multidisciplinary
Vijayalekshmi Vijayakumar, Ji Hyeon Kim, Sang Yong Nam
Summary: In this study, free-standing PIL/IL composite membranes containing different amounts of free Br-6-MPRD were prepared and their structure was confirmed using NMR and FTIR techniques. The membranes showed excellent CO2 permeability and selectivity, approaching the 2008 Robeson limit, which is a significant achievement in CO2 separation and capture applications.
JOURNAL OF INDUSTRIAL AND ENGINEERING CHEMISTRY
(2021)