DHBP

AcronymDefinition
DHBPDihydroxy-2-Butanone-4-Phosphate
DHBPDigital Hero Book Project
DHBPDirect His-Bundle Pacing
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The typical procedure for the synthesis of poly(aryl ether ketone) oligomer containing phthalonitrile (PAEK-CN-II) was as following: To a 100 ml, three-necked flask fitted with a thermometer, a Dean-Stark trap with a condenser, and a nitrogen inlet were added DHBP (8.5688 g, 0.04 mol), DFBN (2.7822 g, 0.02 mol), anhydrous [K.sub.2]C[O.sub.3] powder (6.6341 g, 0.048 mol), toluene (7 ml), and NMP (26 ml).
The oligomers labeled as PAEK-CN-I and PAEK-CN-III with different molecular chain length was also obtained by varying the mole ratio of DFBN to DHBP, respectively, according to the similar procedure above.
As shown in Scheme 1, the potassium diphenolate intermediates were first obtained by different excess feed ratios of DHBP to DFBN, and then they were readily converted to cyano-terminated PAEK-CN oligomer, named as PAEK-CN-I, PAEK-CN-II, and PAEK-CN-III with the addition of NPN into the reaction mixture, respectively.
1) was optimized to ensure a maximum mixing of PP, MAH, DHBP, and fluo-ranthene tracer.
The RTD curves of neat PP and PP with 0.5 wt% DHBP peroxide and various weight concentrations of MAH are shown in Fig.
Before melt mixing, about 45 g of PP powder with a designed composition of [C.sub.60] and DHBP was premixed by high speed pulverator for 2 min.
Compared to PP, adding 0.1 wt% DHBP alone (sample 01OD) led to the serious degradation of PP, as a result.
A polymeric one-component type II photoinitiator (PDABPP) based on 4,4'-dihydroxybenzophenone (DHBP), acryloyl chloride, and piperazine was synthesized, and its structure was confirmed by GPC and [.sup.1.H] NMR.
The DHBP was previously diluted in 1, 2, 4 trichlorobenzene (solution at 15%) to have a good precision on the pump flow rate, even for concentrations less than 1000 ppm (i.e.
The injection of DHBP was housed in a unfilled area, just after the melting zone.
This implies that the free radical grafting itself is an extremely rapid process caused, at least in part, by the very rapid decomposition rate of peroxide used (DHBP).