Structure and properties of a compatible starch‐PCL composite using p‐phthaloyl chloride‐based prepolymer

Abstract

Biodegradable composites from starch and hydrophobic polymer usually show poor compatibility. A novel p-phthaloyl chloride-based prepolymer (PCP) compatibilizer based on p-phthaloyl chloride and polycaprolactone (PCL) diol (2000) was synthesized successfully and the chemical structure was characterized by Fourier transform infrared spectra and 1 H nuclear magnetic resonance (NMR). The PCP compatiblizer was mixed with starch granules to form a coating layer, and then the coated starch granules were melt-compounded with PCL plastic to prepare compatible starch-PCL composites with enhanced properties. The structural, mechanical, thermal properties, and water absorption of the composites were then investigated. It was found that the composites containing the PCP compatibilizer showed better interfacial interaction and compatibility between starch and PCL domains compared to the pure starch-PCL composite, which led to the improved mechanical properties of the composites. The results were attributed to the ester linkage between the PCP compatibilizer and starch as well as the strong physical crosslinking between the PCP compatibilizer and PCL plastic through PCL-PCL crystallinity.

Polyurethane Prepolymer Modified Cassava Starch Based Poly(butylene adipate‐co‐terephthalate) Composites with Excellent Compatibility and High Toughness

“…FTIR results indicated that starch granules were tightly wrapped by crosslinked PU layers due to the urethane bond of PUP and starch. The interaction force between PU layers and the MPBAT was strong because of the similar compatibility between soft segment of PUP and aliphatic segment of MPBAT . When the contents of PUP were up to 13 wt.% (based on the total mass), the tensile strength of MSPT‐2 were improved due to the increase of crosslinked structure of PU layers .…”

“…The absorbed moisture affects the mechanical properties as well as the dimensional stability . Starch is sensitive to water absorption because it has numerous hydroxyl groups . Hydrophobicity plays an important role in improving the water resistance of the starch‐MPBAT composites.…”

“…The interaction force between PU layers and the MPBAT was strong because of the similar compatibility between soft segment of PUP and aliphatic segment of MPBAT. [27] When the contents of PUP were up to 13 wt.% (based on the total mass), the tensile strength of MSPT-2 were improved due to the increase of crosslinked structure of PU layers. [21] After the excessive addition of PUP, the strength decreased, which may be due to reduction of rigid aromatic contents and variation of molecular weight in PBAT.…”

Advanced Carbon Cloth as Current Collector for Enhanced Electrochemical Performance of Lithium‐Rich Layered Oxide Cathodes

“…The formation of AlF 3 on Al foil and the chemical dissolution of a native Al 2 O 3 then occur, as the following reaction [34] Al ðsÞ þ 3 HF $ AlF 3ðsÞ þ 3 H þ þ 3 e À ð3Þ…”

“…[30,31] The interaction of carbon cloth with CNT can be improved by non-covalent bond modification that are well-known to preserve the intrinsic feature of CNT. [32][33][34] Phenolic resin (PR) contains aromatic rings that can exhibit strong van der waals interaction and p-p interaction with carbon-based materials. [35,36] The polymer wrapping process then can be achieved, facilitating the adhesion between CNT and carbon fiber.…”