Effects of Cyanuric Acid on Crystallization Behavior, Polymorphism, and Phase Transition of Poly(butylene adipate)

Abstract

ABSTACT: Effects of the cyanuric acid (CA) on the isothermal and non-isothermal crystallization, morphology, polymorphic crystalline structure and phase transition on the PBA have been investigated systematically by differential scanning calorimetry (DSC), polarized optical microscopy (POM), wide angle X-ray diffraction (WAXD), Fourier transform infrared (FTIR) spectroscopy. The non-isothermal crystallization temperature increased upon addition of the CA. The crystallization kinetics in the isothermal crystallization was quantitatively analyzed. The CA is an effective nucleating agent for the enhanced nucleation density and decreased spherulite size of the PBA.Addition of the CA was favorable for the formation of the PBA α modification, and accelerated the phase transition from the β-to α-modification. The mechanisms of nucleation, preferential formation of the PBA α modification, and accelerated phase transition have also been proposed.

Polymorphism and properties of biodegradable poly(1,4‐butylene adipate) tailored using an aliphatic diamide derivative

“…In this work, the preferential formation of the PBA α ‐modification (that is, decreased T c, α ) is probably attributed to a good crystal lattice matching (between the PBA α ‐crystal and the EBH crystal) which induces the epitaxial growth of the PBA α ‐crystal on the EBH surface. Several similar results suggest that the polymorphic selective effect of the NA on the PBA α ‐crystal is mainly attributed to the perfect crystal lattice matching . More in‐depth investigation is needed.…”

“…Nucleating agents (NAs) have been widely utilized to alter physical properties and improve various performances (mechanical properties, biodegradation, gas barrier, transparency, electrical conductivity, thermal stability, and so on) of polymeric material, due to the efficiency, low cost, convenience and ease of fabrication of the composite material . Some NAs have been used to manipulate the crystallization behavior, polymorphic crystalline structure and biodegradation of PBA . Owing to weak interface bonding strength between PBA and NA (in particular, inorganic NAs) and insolubility of the NA in the melting PBA matrix, agglomeration (that is, inhomogeneous dispersion) of the NA occurs, resulting in a difficulty in controlling the crystal shape/size and enhancing the nucleation ability.…”

Using Bar Infrared Spectra and Coincidence Indexes to Study the Diversity of Solid Cyanuric Acid Structures

“…Other, albeit less informative, assignments can be found in the literature, such as Padgett and Hamner, 16 Loughran et al, 17 Chen et al, 18 and Surinwong et al 19 References can also be found in the literature regarding polymorphs of cyanuric acid derivatives, such as Barnett et al, 20 who discuss the polymorphism in hydrogen bonded adducts of cyanuric acid-bis(4-pyridyl)ethane, and Yang et al, 21 who address the effects of cyanuric acid on the polymorphism of poly(butylene adipate).…”

Fractionated crystallization, polymorphism and crystal transformation of poly(butylene adipate) confined in electrospun immiscible blend fibers with polystyrene

“…9 The b crystal can transform to the a crystal by annealing at a relatively high temperature, which has been demonstrated to be a solid-solid transformation process. Therefore, besides temperature, the nucleating agent, [11][12][13][14] blending, 15-20 copolymerization, 10,21,22 substrate, [23][24][25][26] and tension, 9 etc. 10 Polymorphism regulation of PBA is a hot research topic, because both a and b PBA crystals can be easily obtained and stay rather stable under mild conditions compared with other polyesters.…”

“…8 Recently, we have shown that the b / a crystal transformation mechanism would change to melt-recrystallization aer randomly introducing butylene fumarate units into PBA main chains. For example, added carbon nanobers can expand the formation temperature of the a crystal to as low as 0 C, 13 and the b / a crystal transformation behavior of PBA in the PBA/poly(vinyl phenol) (PVPh) blends could be signicantly accelerated due to the formation of intermolecular hydrogen bonds and the appearance of imperfect b crystals. Therefore, besides temperature, the nucleating agent, [11][12][13][14] blending, 15-20 copolymerization, 10,21,22 substrate, [23][24][25][26] and tension, 9 etc.…”