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Polyelectrolyte - surfactant complexes ( PE - S ) formed by double hydrophilic cationic polyelectrolyte poly [ 3 , 5 - bis ( dimethylaminomethyl ) - 4 - hydroxystyrene ] - block - poly ( ethylene oxide ) ( NPHOS - PEO ) and anionic surfactant sodium dodecyl sulfate ( SDS ) in acidic aqueous solutions were studied by light scattering , SAXS , and scanning transmission electron microcopy in the environmental mode ( wet - STEM ) for various stoichiometric ratios between the numbers of SDS anions and dimethylaminomethyl groups of NPHOS in the complex .
 Chemical: poly [ 3 , 5 - bis ( dimethylaminomethyl ) - 4 - hydroxystyrene ] - block - poly ( ethylene oxide ); Chemical: NPHOS - PEO; Chemical: sodium dodecyl sulfate; Chemical: SDS; Chemical: dimethylaminomethyl; Chemical: NPHOS
Please list all entity words in the text that fit the category.Output format is "type1: word1; type2: word2". 
Option: Chemical 
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Answer:
 Chemical: poly [ 3 , 5 - bis ( dimethylaminomethyl ) - 4 - hydroxystyrene ] - block - poly ( ethylene oxide ); Chemical: NPHOS - PEO; Chemical: sodium dodecyl sulfate; Chemical: SDS; Chemical: dimethylaminomethyl; Chemical: NPHOS