Synthetic Ni‐talc as filler for producing polyurethane nanocomposites

Abstract

New synthetic Ni-talc was used as filler in the synthesis of polyurethane (PU) nanocomposites by in situ polymerization and to emphasize the contribution of the new material compared with natural talc. Good dispersion of Ni-talc was supported by homogeneous green coloration observed in the polymer matrix. X-ray diffraction (XRD) analyses indicate the intercalation of polymeric matrix into the filler layers by the increase in d 001 -spacing value of the Ni-talc for the nanocomposites when compared to the pristine filler. The nanocomposites obtained with synthetic talc showed an improvement in the crystallization temperature and in thermal stability when compared to pure PU and the composite obtained with natural talc. The young modulus of PU/talc materials containing both Ni-talc and natural talc were slight higher than pure PU. As shown by scanning electron microscope (SEM), Ni-talc fillers were well dispersed into the polymeric matrix probably due to the good compatibility of both phases filler/polymer mainly achieved by the filler OH interaction with the urethane group of the polymeric chain.

Synthetic silico-metallic mineral particles (SSMMP) as nanofillers: comparing the effect of different hydrothermal treatments on the PU/SSMMP nanocomposites properties

“…These hydroxyl groups of the SSMMP compete with the hydroxyl groups of the PCL diol, resulting Fig. 2 Overlay IR spectra of the samples: a PU pure; b PU/SSMMP 7 h/3 wt% and c SSMMP 7 h pure in lowering the polymerization yield, and consequently smaller polymer chains when compared to the pure polymer, this behavior was also observed for PU/TiO 2 and PU/talc-Ni nanocomposites [28,35,36].…”

“…The degradation temperature of the pure polyurethane was the lowest, with a value of 301°C, and the degradation temperature for the two different cases of the nanocomposites with 3 wt% of SSMMP (7 and 24 h) was the highest, with values of 340 and 337°C, respectively. The increase in the surface area led to an increase on the T onset temperature, for example, PU/Ni-talc nanocomposites with BET value of 135 m 2 g -1 had a T onset of *324°C and a PU/natural talc composite had almost the same value that for pristine PU [28]. These results corroborate with the work of Yousfi et al [27], indicating the exfoliation of the synthetic talc as a probable reason for the augmentation on the thermal stability of the nanocomposites.…”

“…Wang et al notice that the significant increase of the crystallization temperature is explained by a nucleating effect of the talc particles, which generally leads to numerous but small spherulites [18]. The natural talc composites presented a Tc similar to pure PU [28]. Besides the high ordered structure of the natural talc, its low specific surface area, (BET value of around 20 m 2 g -1 ) [6,8], when compared to SSMMP must be responsible by the suppression of the improvement of the composites PU/talc crystallization temperature.…”

“…Especially, there are many researches on the effect of talc on the mechanical properties, thermostability, crystallizability and rheology of polypropylene/talc composites [8,[17][18][19][20][21][22][23][24][25][26]. Yousfi et al reported the use of new synthetic talc as nanofiller reinforcement for polypropylene and polyamide 6 systems [8] and polypropylene/polyamide 6 blends [27], and our group noticed the use of new synthetic talc-Ni as filler to produce polyurethane nanocomposites [28].…”

Synthesis, characterization, thermal stability, and compatibility properties of poly(vinylp‐nitrobenzal acetal)‐g‐polyglycidylazides

“…The peak at 1223 cm 21 was assigned to the COAO stretching vibration. 23 Bands at 1113 and 1016 cm 21 were related to acetal group CAOAC vibration coupling. The peak at 1070 cm 21 was identified as ester group CAOAC stretching vibrations.…”