Poly(para-phenylene) ionomer membranes: effect of methyl and trifluoromethyl substituents

2021 ◽  
Author(s):  
Fanghua Liu ◽  
Jinju Ann ◽  
Junpei Miyake ◽  
Kenji Miyatake
Keyword(s):  
Molecular Weight ◽  
High Molecular Weight ◽  
Main Chain ◽  
Polymer Main Chain ◽  
Ionomer Membranes ◽  
Sulfonated Poly

Sulfonated poly(para-phenylene)s with high molecular weight and membrane forming capability were obtained by use of the effect of methyl and trifluoromethyl substituents. The linearity of the polymer main chain decreased...

Changes in Molecular Weight of Poly(Styrenesulfonate) Initiated by Thioxanthone: Photolysis and Photo-Oxidation

2016 ◽  
Vol 869 ◽  
pp. 346-349
Author(s):  
Josy Anteveli Osajima ◽  
Carla Cristina Schmitt Cavalheiro ◽  
Miguel Guillermo Neumann
Keyword(s):  
Aqueous Solution ◽  
Molecular Weight ◽  
Main Chain ◽  
Inert Atmosphere ◽  
Kinetic Behavior ◽  
Photo Oxidation ◽  
Polymer Main Chain ◽  
Air Atmosphere ◽  
Atmosphere System ◽  
Kinetics Of

The presence of dyes in colored polymers can cause a series of reactions that promote their photodegradation under irradiation. The aim of this study was to investigate the kinetic behavior of the photodegradation of poly (sodium 4-styrenesulfonate) (PSS) in aqueous solution or in the presence of thioxanthone (TX) under UV radiation in different atmospheres. These systems were monitored by SEC. The polydispersity decreased in all systems studied indicating that there was a breach of the polymer main chain. Only the PSS / TX / air atmosphere system peaked, which occured at 43h of irradiation. However, this system showed slower kinetics of polymeric scission due to the dye suppressing a transfer of energy from the triplet state to the polymer. The photodegradation of solutions of PSS / air atmosphere showed higher efficiency under ultraviolet radiation in relation to the PSS in the presence or absence of the dye under an inert atmosphere.

Synthesis of high molecular weight sulfonated poly(arylene ether sulfone) copolymer without azeotropic reaction

2015 ◽  
Vol 275 ◽  
pp. 92-96 ◽  
Author(s):  
So Young Lee ◽  
Yeonhye Kwon ◽  
Bo Hyun Kim ◽  
Jieon Chae ◽  
Jong Hyun Jang ◽  
...  
Keyword(s):  
Molecular Weight ◽  
High Molecular Weight ◽  
Arylene Ether ◽  
Sulfonated Poly

scholarly journals Boron–nitrogen main chain analogues of polystyrene: poly(B-aryl)aminoboranes via catalytic dehydrocoupling

2017 ◽  
Vol 53 (85) ◽  
pp. 11701-11704 ◽  
Author(s):  
Diego A. Resendiz-Lara ◽  
Naomi E. Stubbs ◽  
Marius I. Arz ◽  
Natalie E. Pridmore ◽  
Hazel A. Sparkes ◽  
...  
Keyword(s):  
Molecular Weight ◽  
High Molecular Weight ◽  
Main Chain ◽  
Aryl Amine ◽  
Amine Boranes ◽  
Boron Nitrogen

High molecular weight B-arylated polyaminoboranes are obtained via catalytic dehydropolymerisation of B-aryl amine–boranes and represent the first inorganic polystyrene analogues with a B–N main chain.

scholarly journals [Rh(L-alaninate)(1,5-Cyclooctadiene)] Catalyzed Helix-Sense-Selective Polymerizations of Achiral Phenylacetylenes

Polymers ◽  
2018 ◽  
Vol 10 (11) ◽  
pp. 1223 ◽  
Author(s):  
Qingyu Wang ◽  
Hongge Jia ◽  
Yongqiang Shi ◽  
Liqun Ma ◽  
Guoxing Yang ◽  
...  
Keyword(s):  
Molecular Weight ◽  
Main Chain ◽  
Helical Structure ◽  
Active Species ◽  
Rhodium Complex ◽  
High Yield ◽  
Hydroxyl Groups ◽  
High Catalytic Activity ◽  
Chiral Amine ◽  
Polymer Main Chain

The [Rh(L-alaninate)(cod)] (cod = 1,5-Cyclooctadiene) complex was synthesized and characterized. Asymmetric polymerizations of achiral phenylacetylene with two hydroxyl groups and a dodecyl group (DoDHPA) were performed by using the rhodium complex as the catalyst to provide polymers with a higher molecular weight (>105) than the polymers obtained using the [Rh(cod)Cl]2 initiator systems. The resulting polymers showed circular dichroism (CD) signals at approximately 310 and 470 nm, indicating that they have a preferential one-handed helical structure. The helix sense in the polymer main chain was controlled by the sign of the catalyst chirality. These findings suggest that the rhodium complex with a chiral amine is the true active species for the helix-sense-selective polymerization of DoDHPA. The [Rh(L-alaninate)(cod)] complex also exhibits high catalytic activity in the polymerization of phenylacetylene (PA) to give a high yield and molecular weight. All these results demonstrate that this Rh complex is an excellent catalyst for the polymerization of phenylacetylene monomers.

scholarly journals High molecular weight mechanochromic spiropyran main chain copolymers via reproducible microwave-assisted Suzuki polycondensation

2015 ◽  
Vol 6 (19) ◽  
pp. 3694-3707 ◽  
Author(s):  
Lukas Metzler ◽  
Thomas Reichenbach ◽  
Oliver Brügner ◽  
Hartmut Komber ◽  
Florian Lombeck ◽  
...  
Keyword(s):  
Molecular Weight ◽  
High Molecular Weight ◽  
Molar Mass ◽  
Main Chain ◽  
Microwave Assisted ◽  
Suzuki Polycondensation

Mechanochromic spiropyran main chain copolymers with high and reproducible molar mass can be made using microwave-assisted Suzuki–Miyaura polycondensation.

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