Two types of lignin particles were used in this work e kraft
lignin (KL) powder fromWeyerhaeuser (FederalWay,Washington)
with molecular weight (Mw) ~5090 g/mol, polydispersity index
~5.4, and glass transition temperature (Tg) ~128 C and calcium
lignosulfonate D618 (LS) particles obtained from Borregaard
Lignotech (Rothschild, Wisconsin). The generic structure of these
lignin molecules is the same. However, the sulfonate groups in LS
particles promote its solubility in water. Carbon black grade N330
manufactured by Sid Richardson (Fort Worth, TX) and styrene
butadiene rubber (SBR), grade SLF18B10 obtained from Goodyear
Tire and Rubber Co. were used in preparation of rubber compounds.
The SBR contained 18.5 wt% styrene. The rubber curing package
included zinc oxide powder, stearic acid in bead form, sulfur curing
agent (Rubber Maker), and N-cyclohexylbenzothiazole-2-sulfenamide
(CBS) accelerator, all obtained from Akrochem Corporation
(Akron, OH).
Two types of lignin particles were used in this work e kraft
lignin (KL) powder fromWeyerhaeuser (FederalWay,Washington)
with molecular weight (Mw) ~5090 g/mol, polydispersity index
~5.4, and glass transition temperature (Tg) ~128 C and calcium
lignosulfonate D618 (LS) particles obtained from Borregaard
Lignotech (Rothschild, Wisconsin). The generic structure of these
lignin molecules is the same. However, the sulfonate groups in LS
particles promote its solubility in water. Carbon black grade N330
manufactured by Sid Richardson (Fort Worth, TX) and styrene
butadiene rubber (SBR), grade SLF18B10 obtained from Goodyear
Tire and Rubber Co. were used in preparation of rubber compounds.
The SBR contained 18.5 wt% styrene. The rubber curing package
included zinc oxide powder, stearic acid in bead form, sulfur curing
agent (Rubber Maker), and N-cyclohexylbenzothiazole-2-sulfenamide
(CBS) accelerator, all obtained from Akrochem Corporation
(Akron, OH).
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