Effects of Lignin Derivatives on Cross-Link Density and Dielectric Properties in the Epoxy-Based Insulating Materials for Printed Circuit Boards

Abstract

Bio-plastics are made from renewable biomass sources. We focus on lignin and develop epoxy resins containing lignin derivatives. We describe the preparation and application of epoxy resin containing lignin as a matrix. Soda-lignin (SLG) is obtained from black liquor in a soda pulp process. First, we use a lignin manufacturing process in which a methanol extraction method enabled reduction in the molecular and hydroxyl equivalent weights of lignin and removal of SiO 2 and cellulose. Second, we investigate the ratio of diglycidyl ether of bisphenol-A (DGEBA) and methanol extraction SLG (me-SLG). From the viewpoint of cross-linking density and dielectric properties, 100/84 phr in the DGEBA/me-SLG casting system is found to be preferable. Finally, we try to fabricate an insulating material made up of DGEBA/me-SLG for an aluminum-based printed circuit board, and it achieves standard values.Index Terms-Epoxy resin, lignin, printed circuit board.

Long-Term Sustained Drug Delivery via 3D Printed Masks for the Development of a Heparin-Loaded Interlayer in Vascular Tissue Engineering Applications

“…To accomplish this goal, we developed two masks to reduce the amount of UV light exposure during a single crosslinking step. The reduction in UV light exposure from mask 1 and mask 2 correspond to a decrease in elastic modulus, which affirms the previously established correlation between UV exposure and modulus. , Elastic modulus is proportional to the density of crosslinks; , therefore, the use of masks during UV crosslinking results in a decrease in crosslinking density as well. The masks developed in this work provide a means to spatially control crosslinking across the graft with a single-step process, as opposed to more traditional methods of controlling crosslinking. ,, Furthermore, the inverse relationship between elastic modulus and pore size has been well characterized in the literature, − which suggests that the masks increase pore size and may contribute to differences in drug release, as well.…”

“…The reduction in UV light exposure from mask 1 and mask 2 correspond to a decrease in elastic modulus, which affirms the previously established correlation between UV exposure and modulus. 24,25 Elastic modulus is proportional to the density of crosslinks; 42,43 therefore, the use of masks during UV crosslinking results in a decrease in crosslinking density as well. The masks developed in this work provide a means to spatially control crosslinking across the graft with a single-step process, as opposed to more traditional methods of controlling crosslinking.…”

Reinforcing styrene butadiene rubber with lignin-novolac epoxy resin networks

“…There is an evident T g2 after incorporation of F51 at a level above 5 phr, and the tan peak of T g2 become increasingly obvious with the increasing loading of F51. It is logical to conclude that the T g2 is the glass transition temperature of lignin-F51 [33,34]. The emergence of T g2 further substantiate the existence of the F51-lignin networks.…”

Attapulgite–MXene Hybrids with Ti3C2Tx Lamellae Surface Modified by Attapulgite as a Mechanical Reinforcement for Epoxy Composites

“…The crosslinking density ( ) was calculated by Equation (1) [ 40 ] as follows: where is the storage modulus, is the gas constant, is the absolute temperature, and is the front factor. The storage modulus at T g + 50 °C was used to calculate the crosslinking density [ 41 ]. The varying in the range of 0.4–1.6, therefore, a value of = 1 was used for a good order-of-magnitude prediction [ 42 ].…”