A membrane obtainable from curing a composition comprising: (i) a curable compound comprising at least two (meth)acrylic groups and a sulphonic acid group and having a molecular weight which satisfies the equation:

MW<(300+300n) wherein: MW is the molecular weight of the said curable compound; and n has a value of 1, 2, 3 or 4 and is the number of sulphonic acid groups present in the said curable compound; and optionally (ii) a curable compound having one ethylenically unsaturated group; wherein the molar fraction of curable compounds comprising at least two (meth)acrylic groups, relative to the total number of moles of curable compounds present in the composition, is at least 0.25.

The present invention provides a method for preparing a sample characterized by binding a substance A containing a hydrazide group to a sugar chain and/or a sugar derivative via hydrazone formation between the hydrazide group of the substance A and the reducing end of the sugar chain and/or the sugar derivative thereby to enable the separation and purification of the sugar chain and/or the sugar derivative for an analytical sample from a biological sample containing the sugar chain and/or the sugar derivative by a simple operation.

The present invention provides a method for preparing a sample characterized by binding a substance A containing a hydrazide group to a sugar chain and/or a sugar derivative via hydrazone formation between the hydrazide group of the substance A and the reducing end of the sugar chain and/or the sugar derivative thereby to enable the separation and purification of the sugar chain and/or the sugar derivative for an analytical sample from a biological sample containing the sugar chain and/or the sugar derivative by a simple operation.

A polymerizable composition includes an amide compound represented by Formula (1) and a polymerization initiator.

The invention relates to water soluble crosslinkable prepolymers for the preparation of chemically stable crosslinked polymer gels, a process for preparing the same, compositions containing the same and their use such as a medical or dental filler composition.

Based on an aramid polymer prepared, the modified aramid dope is prepared through a combination of covalent crosslinking and non-covalent crosslinking. By adjusting the amounts of a crosslinking agent and a polar polymer, an aramid film is obtained that meets the following requirements simultaneously: superior heat resistance and mechanical strength, high toughness, a simple preparation process, high stretchability, and resistance to breakage. Furthermore, the aramid film can be directly laminated with aramid paper without use of an adhesive, so that a flexible composite material in compliance with insulation class F or H is prepared through direct lamination. This application is widely applicable to motors, generators, transformers, adhesive tape, and other fields.

Based on an aramid polymer prepared, the modified aramid dope is prepared through a combination of covalent crosslinking and non-covalent crosslinking. By adjusting the amounts of a crosslinking agent and a polar polymer, an aramid film is obtained that meets the following requirements simultaneously: superior heat resistance and mechanical strength, high toughness, a simple preparation process, high stretchability, and resistance to breakage. Furthermore, the aramid film can be directly laminated with aramid paper without use of an adhesive, so that a flexible composite material in compliance with insulation class F or H is prepared through direct lamination. This application is widely applicable to motors, generators, transformers, adhesive tape, and other fields.