In this work, the interaction between PCC in NR latex and physical properties of the resulting films were studied. PCC dispersion was first prepared and its colloidal properties together with the colloidal properties of prevulcanised natural rubber (PV-NR) latex were investigated using particle size analysis, zeta potential and rheology. PCC dispersion and PV-NR latex were then mixed together and their interaction was followed by rheology. Next, the dipped films were prepared and the resulting film thickness and tensile properties were determined. PCC dispersion showed an average particle size of 4.2 µm with a wide particle distribution whereas PV-NR latex showed an average particle size of 0.74 µm with a much narrower particle distribution. Viscoelastic studies showed PCC dispersion to be an elastic material whereas PV-NR latex was observed to be a viscous material. Mixing of the two materials produced a change in the rheological behaviour. Up to 30 phr PCC loading, flow studies revealed the mixtures to behave as Bingham materials but above that, the mixtures behaved as Herschel–Bulkley materials. Viscoelastic measurements showed that the initially viscous PV-NR latex became more elastic with increasing PCC loading. A shift from dominant viscous to dominant elastic behaviour was observed with the addition of 80 phr PCC in the latex. Thickness and tensile stress of the dipped films increased with increasing PCC loading. However, both tensile strength (TS) and elongation at break (EB) of the films reduced with increasing PCC loading. Ageing caused reduction in tensile stress but EB and TS increased. The increase in TS was, however, only observed to occur up to 15 phr PCC loading.

中文翻译：

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沉淀碳酸钙分散体的胶体性质及其对预硫化天然橡胶胶乳流变学和薄膜拉伸性能的影响

在这项工作中，研究了NR胶乳中PCC与所得膜的物理性能之间的相互作用。首先制备PCC分散体，并使用粒度分析，ζ电位和流变学研究其胶体性质以及预硫化天然橡胶（PV-NR）胶乳的胶体性质。然后将PCC分散液和PV-NR胶乳混合在一起，并进行流变学研究。接下来，制备浸渍膜并确定所得膜的厚度和拉伸性能。PCC分散体的平均粒径为4.2 µm，粒径分布较宽，而PV-NR胶乳的平均粒径为0.74 µm，粒径分布较窄。粘弹性研究表明，PCC分散体是一种弹性材料，而观察到PV-NR胶乳是一种粘性材料。两种材料的混合改变了流变性能。在最高30 phr PCC载荷下，流动研究表明混合物表现为宾厄姆材料，但在此之上，混合物表现为Herschel–Bulkley材料。粘弹性测量表明，最初的粘性PV-NR乳胶随着PCC负载的增加而变得更具弹性。通过在乳胶中添加80 phr PCC，可以观察到从主要粘性行为向主要弹性行为的转变。浸渍膜的厚度和拉伸应力随着PCC载荷的增加而增加。但是，随着PCC负载的增加，薄膜的拉伸强度（TS）和断裂伸长率（EB）均降低。老化导致拉伸应力降低，但EB和TS增加。但是，仅在15 phr PCC负载以下才观察到TS的增加。