scholarly journals Synthesis and characterization of a novel inulin hydrogel crosslinked with pyromellitic dianhydride

2019 ◽  
Vol 134 ◽  
pp. 104-111 ◽  
Author(s):  
Franklin Afinjuomo ◽  
Thomas G. Barclay ◽  
Yunmei Song ◽  
Ankit Parikh ◽  
Nikolai Petrovsky ◽  
...  
Keyword(s):  
Pyromellitic Dianhydride ◽  
Synthesis And Characterization

Synthesis and Characterization of Highly Branched Poly(urethane-imide)s

2009 ◽  
Vol 79-82 ◽  
pp. 1575-1578
Author(s):  
Wen Qiu Chen ◽  
Chang Feng Yi ◽  
Zu Shun Xu
Keyword(s):  
Weight Loss ◽  
Acid Corrosion ◽  
Pyromellitic Dianhydride ◽  
Synthesis And Characterization ◽  
Aprotic Solvents ◽  
Dilute Acid ◽  
Chain Segment ◽  
Step Method ◽  
Aggregation Structure

A series of novel highly branched poly(urethane-imide)s (PUIs) were first successfully prep- ared by a two-step method with toluene-2,4-diisocyanate (TDI), pentaerythritol (PAT) and dianhydrides, including pyromellitic dianhydride (PMDA), 3,3′,4,4′-benzophenonetetracarboxylic dianhydride (BTDA) and 4,4'-oxydiphthalic anhydride (ODPA). It was found that the prepolymerization of PAT and TDI at 40 °C was ascertained to be 40 minutes. And the imidization of the prepolymer and PMDA was successfuly carried out after 120 °C for 2 hours. The XRD demonstrated that the obtained highly branched PUIs pre- sented semicrystalline aggregation structure which had clear crystal phase with the d-spacing around 0.39 nm. TGA curves exhibited that these highly branched PUIs had obviously two steps of weight loss attributed to the urethane chain segment and imide chain segment, respectively. The solubility testing indicated that the highly branched PUIs exhibited desirable solubility in various polar aprotic solvents, and were also resistant to dilute acid corrosion.

Synthesis and characterization of the tert-butyl ester of the oxydianiline/pyromellitic dianhydride polyamic acid

1989 ◽  
Vol 22 (12) ◽  
pp. 4477-4483 ◽  
Author(s):  
F. M. Houlihan ◽  
B. J. Bachman ◽  
C. W. Wilkins ◽  
C. A. Pryde
Keyword(s):  
Butyl Ester ◽  
Pyromellitic Dianhydride ◽  
Synthesis And Characterization ◽  
Polyamic Acid ◽  
Tert Butyl

Synthesis and Characterization of Thermoplastic Poly (ether-imide) Elastormer Based on Di-(4-Aminopheny)Methane-Pyromellitimide Unit

2013 ◽  
Vol 423-426 ◽  
pp. 498-502
Author(s):  
Jiao Jiao Shang ◽  
Ming Lei ◽  
Shao Jian Lin ◽  
Jian Wu Lan ◽  
Xia Huang ◽  
...  
Keyword(s):  
Thermogravimetric Analysis ◽  
Ir Spectra ◽  
Chemical Resistance ◽  
Pyromellitic Dianhydride ◽  
Synthesis And Characterization ◽  
Scanning Calorimetry ◽  
Solubility Behavior ◽  
Ft Ir

Novel polymers with imide and ether were synthesized by pyromellitic dianhydride and Pyromellitic dianhydride (PMDA), 4,4'-metylenedianiline (MDA), amino-teminated polyoxypropylene (D2000). The structures and thermostability of polymer were characterized through FT-IR spectra, thermogravimetric analysis (TGA) and differental scanning calorimetry (DSC), solubility behavior was determined via seven solvents. The results indicate that these polymers have good chemical resistance and exhibit excellent thermostability owing to the introduction of imide units.

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