scholarly journals Ring opening copolymerisation of lactide and mandelide for the development of environmentally degradable polyesters with controllable glass transition temperatures

2018 ◽  
Vol 128 ◽  
pp. 16-23 ◽  
Author(s):  
Geert-Jan Graulus ◽  
Niels Van Herck ◽  
Kristof Van Hecke ◽  
Gonzalez Van Driessche ◽  
Bart Devreese ◽  
...  
Keyword(s):  
Glass Transition ◽  
Ring Opening ◽  
Transition Temperatures ◽  
Glass Transition Temperatures ◽  
Degradable Polyesters

scholarly journals Cyclohexyl-substituted poly(phosphonate)-copolymers with adjustable glass transition temperatures

2016 ◽  
Vol 7 (17) ◽  
pp. 2934-2937 ◽  
Author(s):  
Thomas Wolf ◽  
Johannes Naß ◽  
Frederik R. Wurm
Keyword(s):  
Glass Transition ◽  
Ring Opening ◽  
Ring Opening Polymerization ◽  
Transition Temperatures ◽  
Glass Transition Temperatures ◽  
Anionic Ring ◽  
Poly Ethylene

2-Cyclohexyl-2-oxo-1,3,2-dioxaphospholane (cyHexPPn), a new monomer for the anionic ring-opening polymerization to poly(ethylene alkyl phosphonate)s is presented.

Synthesis and Properties of New Triphenylamine-Containing Aromatic Polyimides Based on N,N′-Bis(4-Aminophenyl)-N,N′-Diphenyl-4,4′-Biphenyldiamine

2003 ◽  
Vol 15 (3) ◽  
pp. 281-290 ◽  
Author(s):  
Yoshio Imai ◽  
Mina Ishida ◽  
Masa-Aki Kakimoto
Keyword(s):  
Weight Loss ◽  
Glass Transition ◽  
Tensile Properties ◽  
Organic Solvents ◽  
Ring Opening ◽  
Aromatic Diamine ◽  
Transition Temperatures ◽  
Glass Transition Temperatures ◽  
Aromatic Polyimides ◽  
Step Procedure

A new aromatic diamine monomer, N,N′-bis(4-aminophenyl)-N,N′-diphenyl-4,4′-biphenyldiamine, was first synthesized in two steps by the condensation of N,N′-diphenyl-4,4′-biphenyldiamine with 4-fluoronitrobenzene, followed by reduction. New triphenylamine-containing aromatic polyimides having inherent viscosities of 0.67-0.91 dl g−1 were synthesized from the aromatic diamine and various aromatic tetracarboxylic dianhydrides by the conventional two-step procedure that included ring-opening polyaddition giving precursor polyamic acids and subsequent thermal cyclodehydration. Most of the aromatic polyimides were soluble on heating in organic solvents such as dimethylacetamide, m-cresol, pyridine, and chloroform, and gave flexible and tough films with good tensile properties. The glass transition temperatures and 10% weight loss temperatures of the polyimides were in the range of 293-361 and 565-595 °C, respectively, in nitrogen.

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