Core-shell-structured silica/polyacrylate particles prepared by Pickering emulsion: influence of the nucleation model on particle interfacial organization and emulsion stability

Table 3 Stability of polyacrylate latex, composite latex, and polyacrylate/12% SiO ₂ blend latex

Emulsion	MMA/BA (mass ratio)	Feed SiO₂(wt.%)	Store stability^c(days)	Ca²⁺stability^d(ml)	Morphology
Composite emulsion^a	1/3	12	50		Non-continuous film
	1/1	12	180		Loosely packed
	2/1	12	60		Bare ball
	3/1	12	30		Bare ball
	1/0	12	Aggregation
		12	200	38	Raspberry-like
	1/2	0	60	20
		3	150	26.2	Raspberry-like
		5	350	25.8	Raspberry-like
Blend of acrylic emulsion^b and silica sol	1/2	12	1	9

^aSolid content of emulsion is 39%, and the monomers were fed dropwise; ^bthe acrylic emulsion prepared with the MMA/BA of 1/2; ^cThe shelf life at room temperature until gelation, aggregation or delamination was observed; ^dthis is determined by the following: To 16 ml of emulsion sample was added a 0.5 wt. % of calcium chloride solution dropwise until the flocculation was observed. The least volume of the calcium chloride solution required for emulsion flocculating was designated to the Ca²⁺stability.