Inorganic–Organic Hybrid Materials Based on Amino Acid Modified Hydrotalcites Used as UV‐Absorber Fillers for Polybutylene Succinate

Abstract

Polybutylene succinate (PBS)‐functionalized nanocomposites with amino acid tyrosine (TYR)‐ and tryptophan (TRY)‐hybrid‐interleaved layered double hydroxide (LDH) materials exhibit interesting anti‐UV properties and rheological properties. Embedding amino acid into the layered double hydroxide container preserves the UV shielding property of the pristine organic molecule. When employed in an aliphatic polymer such as PBS, chain scission occurs during photoageing and accelerates the degradation of the raw material. However the embedded inorganic amino acid melt blended with PBS prevents such degradative phenomenon. An investigation of their structure–property relationship (i.e., nonmiscibility and expanded PBS nanocomposite structures) was conducted. The nonmiscible structure observed for LDH‐TYR was found to be associated with a chain‐extender behaviour, whereas the interleaved structure of PBS‐LDH‐TRY yielded a liquid–gel transition. Both PBS nanocomposite structures were found to be stable under agressive UV conditions, whereas amino acid free of an LDH container resulted in a deleterious effect when dispersed in PBS, largely promoting PBS chain scission. Hence amino acid organically modified hydrotalcites appear to hold promise for use as UV absorbers when dispersed into other aliphatic biodegradable polymers.

Solution‐Grown Zn/Al Layered Double Hydroxide Nanoplatelets onto Al Thin Films: Fine Control of Position and Lateral Thickness

“…The (00 ) reflections, in particular, allow directly determining the lattice parameter , which gives the total thickness of the brucite-like layer plus an interlamellar space. The average value obtained for this sample is close to 22.64Å, in good agreement with the values reported in literature [1,16,24,[30][31][32], also in consideration of the large variability of the interlamellar space, due to the different intercalated anions.…”

“…By using the -parameter experimentally obtained from symmetrical (00l) reflections, we could calculate the lattice parameter, corresponding to the distance between two metal cations. Specifically, the peak positions of the nonbasal reflections give a value of lattice parameter with an average value close to 3.062Å and a very small variance, in excellent agreement with the results reported in the literature for (Zn, Al) LDH [1,16,24,[31][32][33]. Figure 5(b) reports the EDS spectrum of a sample at the initial stage of the growth (similar to the one as in Figure 2(a)).…”

“…X-ray diffraction and EDS provide further confirmations of a (Zn, Al) LDH structure similar to that reported in the literature [16,24,[31][32][33]. Figure 5(a) shows the XRD spectrum of LDH nanoplatelets completely formed after a one-hour growth time (the same sample as in Figure 2(c)).…”

Tailoring Hybrid Layered Double Hydroxides for the Development of Innovative Applications

“…Cole–Cole plots exhibit two antagonistic effects occurring during irradiation: chain scission and crosslinking . Similarly, a study reports the use of amino acids such as tyrosine and tryptophan intercalated into ZnAl LDH, and a large number of surfactant molecules were successively used to evince the tendency to delaminate LDH sheets and the subsequent effect on the viscoelastic properties of PBS . Intercalated amino acid molecules act as UV absorbers and LDH platelets stabilize the microstructure of PBS after radiation stress, while reinforcement was only found in tryptophan–ZnAl filler.…”

Structure‐Properties Relationship of In Situ Synthesized Poly(Butylene Succinate)/Silica Nanocomposites: Application in Extrusion Blowing of Films

“…Nanocomposites differ from conventional composite materials due to their exceptionally high surface‐to‐volume ratio of the reinforcing phase. Most of the literature concerning nanocomposites describes PBS modified with layered silicate such as montmorillonite, saponite, layered double hydroxide (LDH) or atapulgite . These nanoclay layers are around 1 nm thick and have very high aspect ratios (from 10–100) .…”