Elastomer thermoplastics are a class of polymeric materials that received industry attention due to the possibility of joining the elastic of elastomers with the thermoplastics processability. The synergistic properties are linked to the appropriate processing. This study evaluated the effect of rotor speed during polymer mixing and the dynamic vulcanization process of polypropylene and nitrile rubber blends. Bismaleimide was employed as multipurpose agent (crosslinking coagent for peroxide and compatibilizer). Morphology, mechanical properties, compression set and oil resistance tests were evaluated for compositions containing 50 and 70 PHR of elastomer. The compatibilization of TPV was realized by infrared spectroscopy. It was shown a compatibilizer effect and better dispersion, achieving the inversion phase, only studying the effect of processing conditions (rotor speed, addition sequence, additives), without any extra interfacial agent. There is a tendency to obtain better performance with decrease speed at dynamic vulcanization or/and at torque stabilization, mainly for blends with 50 PHR of rubber.

Objetivou-se avaliar o desempenho zootécnico e a composição corporal de juvenis de tambacu alimentados com rações contendo níveis crescentes de celulose. 128 juvenis de tambacu (29,0±6,0g) foram distribuídos em 16 tanques (150 L), na densidade de oito exemplares por tanque, em um delineamento inteiramente casualizado com quatro tratamentos (níveis crescentes de celulose: 0; 20; 40 e 60 g kg-1) e quatro repetições. Os parâmetros de desempenho avaliados foram: peso final (PF), consumo de ração (CR), ganho de peso (GP), conversão alimentar aparente (CAA), taxa de eficiência proteica (TEP) e sobrevivência (SOB). Para a análise de composição corporal, foram analisados matéria seca (MS), proteína bruta (PB), extrato etéreo (EE), energia bruta (EB) e matéria mineral (MM). Verificou-se comportamento quadrático (P<0,05) para as variáveis PF, CR, GP e CAA com os melhores resultados obtidos, respectivamente, para os níveis de 19,95; 11,22; 19,87 e 23,86 g kg-1 de inclusão da celulose nas rações. Não houve efeito (P>0,05) dos níveis de inclusão da celulose sobre a TEP, SOB e sobre os parâmetros de composição corporal MS, PB, EE, EB e MM. As rações com maiores níveis de inclusão da celulose afetaram negativamente o desempenho de juvenis de tambacu, no entanto, as modificações fisiológicas e metabólicas provocadas por essas rações não foram suficientes para afetar a composição corporal.

Aimed to evaluate the growth performance and body composition of juvenile tambacu fed diets containing increasing levels of cellulose. 128 juveniles (29.0±6.0g) were distributed into 16 tanks (150 L), at a density of eight fish per tank, in a completely randomized design with four treatments (increasing levels of cellulose: 0, 20, 40 and 60 g kg-1) and four replications. For the growth performance parameters it was evaluated: final weight (FW), feed intake (FI), weight gain (WG), feed conversion rate (FCR), protein efficiency rate (PER) and survival (SUR). For the analysis of body composition, dry matter (DM), crude protein (CP), ether extract (EE), gross energy (GE) and mineral matter (MM) were analyzed. There was a quadratic response (P<0.05) to the FW, FI, WG and FCR variables with the best results obtained, respectively, to levels of 19.95, 11.22, 19.87 and 23.86 g kg-1 of inclusion of cellulose in the rations. There was no effect (P>0.05) of levels of inclusion of cellulose on the PER, SUR and on the parameters of body composition in DM, CP, EE, GE and MM. Diets with high inclusion levels of cellulose adversely affected the performance of juvenile tambacu. However, the physiological and metabolic changes caused by these rations were not sufficient to affect body composition.