Micro- and nano-composites of rubbers structure-properties relationship

Name: Nantikan Phuhiangpa

LCSH: Kasetsart University -- Theses. M.S. (Nanomaterials Science) 2019

Classification :.LCCS: TA455.R8

LCSH: Kasetsart University. -- Department of Materials Science -- Theses

LCSH: Rubber

LCSH: Calcium carbonate

Abstract: Natural rubber (NR) is a bio-based elastomeric material. It is derived by extraction from certain tropical like for instance Hevea brasiliensis. NR is one of the important elastomers and widely utilized to prepare many rubber products, for example, tile floor, tire, glove, pillow and mattress, medical products, etc. There are different grades of NR e.g. ribbed smoked sheet (RSS), pale crepe, brown crape, air dried sheet (ADS), standard Thai natural rubber (STR), etc. Technically specified rubber (TSR) is a standard of NR which is graded by its dirt content, ash content, nitrogen content, volatile matter content and Plasticity retention index, etc. Polybutadiene rubber (BR) is a polymer formed by the polymerization of the monomeric 1,3-butadiene. BR is one of the most popular synthetic rubbers and has rather good mechanical properties. Calcium carbonate (CaCO3) is one of the important inorganic powders and it is widely used as filler in order to reduce the cost in rubber industry. Nano-calcium carbonate (NCC) has been used to add in the rubber, the mechanical properties of nano-composites increase with increasing the amount of NCC. The objective of this study is to investigate the effect of microCaCO3 (MCC) and nano-CaCO3 (NCC) on the properties of rubber composites, in particular structure-properties relationship. Various characterizations of rubber composites, such as Mooney viscosity, bound rubber, Mullins effect, Payne effect, etc., were investigated. The result of Mullins effect of rubber composite filled with MCC is in good agreement with the results of Mooney viscosity and bound rubber: higher Mooney viscosity and bound rubber lead to higher stress to pull the rubber composites. The Payne effect shows that the value of different storage moduli (ΔG’) of rubber composites filled with 25 phr MCC is the lowest due to weaker filler network. While, the rubber supplemented with 100 phr MCC represents more significant ΔG’ with the strain increasing. The results of rubber composites filled with NCC are the same tendency with those of rubber composites filled with MCC. However, the effect of specific surface area of NCC on the properties of rubber composites are more pronounced than those of rubber composites filled with MCC. The master curves of time-temperature superposition present lower free volume in the composites for higher concentration of filler which requires more relaxation time of rubber molecules. This type of nano-calcium carbonate material could be applied for tailoring the compromise of properties and processability of rubber products.

Kasetsart University. Office of the University Library

Address: Bangkok

Email: tdckulib@ku.ac.th

Name: Wirasak Smitthipong

Role: Thesis Advisor

Created: 2019

Issued: 2025-08-03

วิทยานิพนธ์/Thesis

application/pdf

CallNumber: TA455.R8 .N36

eng

DegreeName: Master of Science

Level: Master's Degree

Descipline: Nanomaterials Science

Grantor: Kasetsart University

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