Morphology and properties of highly talc‐ and CaCO₃‐filled poly(vinyl alcohol) composites prepared by melt processing

Abstract

Highly filled poly(vinyl alcohol) (PVA) composites, PVA/talc and PVA/CaCO 3 , were successfully prepared through meltprocessing technology without use of coupling agents or compatibilizers. Morphology analysis showed that both of the two fillers well dispersed in PVA matrix. Differently, the flaky talc obviously oriented, while the particulate CaCO 3 was randomly scattered in PVA matrix. Rheological analysis showed that the two filled systems exhibited a common shear-thinning phenomenon, confirming their pseudoplastic nature. Compared with the particulate CaCO 3 , the flaky talc exhibited a closer arrangement in the composite, resulting in a lower threshold filler content to form the network structure. Therefore, PVA/talc composite showed higher melt viscosity and lower extrudate-swell ratio. The orientation of the flaky talc particles in the system also resulted in the higher melting and heat-deflection temperatures, as well as a greater reinforcement effect on the composite, but a lower elongation at break.

Synthetic Ni‐talc as filler for producing polyurethane nanocomposites

“…The band at 1040 cm −1 and 670 cm −1 are characteristic of the SiO bond. In the regions of 1014 cm −1 and 460 cm −1 bands corresponding to the bond SiOSi, while the bond NiOH appears at 550 cm −1 and 438 cm −1 and the region of 709 cm −1 and 669 cm −1 corresponds to the free OH of the talc structure …”

“…The use of natural talc is well known in literature. This filler has been used in the production of composites with different polymeric matrix, such as poly(vinyl alcohol), LLDPE/MWCNT, thermoplastic polyurethane, thermoplastic polyurethane/polypropylene blends, poly(L‐Lactide), polypropylene, poly(lactic acid), among others. Yousfi et al described the use of new synthetic talc as nanofillers reinforcement for polypropylene and polyamide 6 systems and polypropylene/polyamide 6 blends …”

Thermal Decomposition Kinetics of Poly(L-lactic acid) after Heat Treatment

“…Thus, the effect of the additive on the thermal decomposition of the polymer matrix is also interesting for future research in enabling an understanding the role of additives. CaCO 3 is a common commercial inorganic compound, and widely used to improve the mechanical properties of polymer materials [10][11][12]. Moreover, CaCO 3 as a nucleating agent is used to improve the crystallization behavior of PLLA [13].…”

Chemical degradation of reinforced epoxy‐cement composites under CO2‐rich environments

“…In contrast, yield stress and Charpy notch toughness decrease with increasing talc content; at the highest filler concentration both properties decrease below the matrix level. Although there is a vast literature on the production of composites with talc and different polymer matrices, such as polypropylene , polyurethane , and poly(vinyl alcohol) , the research related to talc‐filled epoxy resins is limited and therefore it is still open to further investigation.…”