Linseed vinyl ester fatty amide toughened unsaturated polyester-bismaleimide composites

Abstract

Bio-based neat unsaturated polyester (UPE) containing linseed vinyl ester fatty amide (LVEFA) modified with N,N 0 -bismaleimido-4,4 0 -diphenyl methane (BMI) composite were prepared with dicumyl peroxide as initiator. Up to 20% of the UPE was replaced by LVEFA to prepare biobased UPE. The combination of UPE and LVEFA resulted in an excellent new biobased thermoset polymer with high toughness at the expense of thermal properties. The loss of thermal properties by the addition of LVEFA to the UPE was compensated through (BMI) reinforcement. Biocomposite were made using BMI (5, 10, 15 wt.%) as thermal modifier, and blends of unsaturated polyester (UPE) and linseed vinyl ester fatty amide as the polymer matrix. The mechanical, thermal, hardness and dielectric properties of the biocomposite increased as a result of the incorporation of BMI. The fractured surface of the composites was analyzed using scanning electron microscopy to understand the morphology.

Facile synthesis of silicone‐toughened unsaturated polyester by hydroxyl‐terminated silicone copolycondensation

“…We guessed that the increase of storage modulus of SUP‐M is attributed to the enhanced crosslinked network of these resins, due to their branched structure and smaller molecular weight. This result is unusual compared with some earlier research . In those reports, the toughness increased with the decrease of storage modulus and T g , which can always be explained by the lower crosslinking density of the UP matrix.…”

“…Nowadays, there is a trend to incorporate chemically modified vegetable oils with UP as impact modifiers. Obviously, this is similar to thermoplastic elastomer blending, in which the increase in toughness is generally achieved by sacrificing stiffness, strength, and the thermal properties of the resulting resins, which are mostly overcome with the introduction of nanoclay and natural fibers . The third approach involves the incorporation of nanoparticles into the UP matrix, such as nanosilica, nano‐Al 2 O 3 , TiO 2 , and nanoclay .…”

Thermal and mechanical properties of functionalized mullite reinforced unsaturated polyester composites

“…However, the use of these materials is often restricted, because of their limited thermal behavior and toughness. To improve these properties a number of fillers, reinforcements, and chemical modifiers were used .…”

Toughening of bamboo fibers/unsaturated polyester composites with 2‐acetoacetoxyethyl methacrylate

“…b), agreeing well with the results of DMA. Due to the incorporation of flexible molecular chains of AAEM in the matrix, the induced yielding process within resins increases the fracture energy required to break the composites . Soft chains can also undergo internal rotation, hence, the proper introduction of AAEM is proposed to improve the crosslinking degree, deformability, and toughness of the resins after curing .…”