Effect of polymer matrices on charge transport in molecularly doped polymers

Abstract

Hole mobilities have been measured in diethylamino-benzaldehyde-diphenylhydrazone (DEH)-doped polymers as a function of the polymer composition, temperature, and electric field. It was found that the electric field dependence on the mobility was a strong function of the binder polymer employed. In all cases, the electric field dependence E can be described as exp(βE1/2T−1). β2 is related to the density of photoinduced spins in the molecularly doped polymers, which are related to the interaction between DEH and the polymer.

Effects of Acute Blood Volume Expansion on Respiratory Mechanics in the Rat

“…These results are in agreement with Freezer al. [3], who reported similar conclusions although by a somewhat different experimental approach. Thus, stress relaxation and pendelluft appear to be influenced by pulmonary blood flow.…”

“…Moreover, in our experiments, data were obtained from individual healthy rats under control conditions and immediately after acute BVE, so that each rat was its own control, and the possible confounding effects of chronic modifications of pulmonary parenchyma and/or vasculature were avoided. Other studies deal with different subjects presenting different ratios of pulmonary to systemic blood flow which had persisted for relatively long times [1,2,3,4,5]. …”

“…This aspect has been studied mainly in infants with various congenital heart defects causing different ratios of pulmonary to systemic blood flow [1,2,3,4,5], and in infants after surgical correction of left to right shunts [6,7], after induction of a left to right shunt [8], or correction of pulmonary hyper- or hypoperfusion [9]. The results of these studies suggest that a high pulmonary blood flow may be associated with increased pulmonary elastance and airway resistance [10,11].…”

Effect of polar additives on charge transport in a molecularly doped polymer: Survey of various additives

“…[1][2][3] As amorphous materials with widely adjustable compositions and properties, they are interesting systems for investigating the effects of disorder on hopping transport. 1,3,4 It has been found that the mobility of charge carriers is dramatically affected by the presence of polar moieties in the monomeric [5][6][7][8][9][10][11] or the polymeric [12][13][14][15][16][17][18][19][20][21][22][23][24][25][26][27][28][29] components. To investigate the mechanism, it is advantageous to hold constant the two major components and evaluate the effect of adding a third, polar component.…”

Effect of polar additives on charge transport in a molecularly doped polymer: Evaluation of disorder models

“…Generally, polymers containing highly polar moieties ͑carbonates, esters, sulfones, etc.͒ diminish the mobility relative to that in nonpolar polymers such as polystyrene. [5][6][7][8][9][10][11][12][13][14][15][16] The nature of the CTM also has a great effect on the transport properties. In particular, by and large, the bigger the dipole moment of the CTM, the lower the mobility.…”