Correlation between hydrogen‐bonding interaction and mechanical properties of polyimide fibers

Abstract

Novel co‐polymerization polyimide (PI) fibers based on 4,4′‐oxydianiline (ODA)‐pyromellitic dianhydride (PMDA) were prepared. 2‐(4‐Aminophenyl)‐5‐aminobenzimidazole (PABZ) containing the NH group was introduced into the structure of the fibers as the proton donor. The results of Fourier transform infrared (FTIR) and dynamic mechanical analysis (DMA) showed that hydrogen bonding occured between the NH group and chains, which strongly enhanced interchain interaction. This hydrogen bonding interaction increased the tensile strength and initial modulus of the PI fibers up to 2.5 times and 26 times, respectively, compared to those of homo‐PI PMDA‐ODA fibers with no hydrogen‐bonding interaction because of the absence of proton donors after the imidization process. In the mean time, glass transition temperature (Tg) of the modified PI fibers was found to be 410–440°C, which was higher than that of the homo‐PI PMDA‐ODA fibers. From the result, a novel access to molecular design and manufacture of high performance PI fibers with good properties could be provided. Copyright © 2009 John Wiley & Sons, Ltd.

Preparation and characterization of Polyimide/Al2O3 nanocomposite film with good corona resistance

“…However, there is an interesting phenomenon happened when we watched closely. At 1,720 cm 21 nearby, the characteristic peak of symmetric C@O stretching appeared small redshift which should be possible attributed to the formation of hydrogen bonding caused by the interaction between hydroxyl on the surface of nano-Al 2 O 3 particle and carbonyl in the PI matrix, which is similar to the results reported by Liu et al [20] and Velayutham et al [21]. The emergence of hydrogen bonding can improve the compatibility of nanoparticles and imide substrate, and make the nano-Al 2 O 3 dispersed more evenly in PI matrix, which consistent with the subsequent observation by SEM.…”

Bacterial Cellulose From Rice Waste Water and Its Composite Which Are Deposited Nanoparticle as an Antimicrobial Material

“…The more hydrogen bonds and high crystallinity of the CGN cause it is able to withstand loads better than the CN. The correlation between the increasing in hydrogen bonding and the tensile strength proved that the increasing of hydrogen bonds will increase the tensile strength (Zhong and Xia, 2008;Zhang et al, 2011;Liu et al, 2009;and Tien, 2010). Another possibility is the addition of glycerol can increase molecular mass of the CGN.…”

“…The decreasing of the crystallinity of cellulose decreases the load bearing strength of the CChN. A material is structurally strong because of high crystallinity of a resistance to higher pressure, than the materials whose structure is irregular and gives a lot of space around it (Liu et al, 2009). The addition to the amorphous nature of the material that has high crystallinity will make crystalline compound initially be semi-crystalline so many empty spaces that appeared causes of force against the pressure to be reduced.…”

Preparation and characterization of novel polyimide films containing amide groups

“…5, the WAXD curves of the six PI films exhibit broad diffraction peaks at about 20 o . Additionally the order degree of macromolecule in amorphous polymers can be evaluated by equation [12] X…”