The present disclosure relates to polymers which contain a hydrophobic and hydrophilic segment which is sensitive to pH. In some aspects, the polymers form a micelle which is sensitive to pH and results in a change in fluorescence based upon the particular pH. In some aspects, the disclosure also provides methods of using the polymers for the imaging of cellular or extracellular environment or delivering a drug.

The present disclosure relates to polymers which contain a hydrophobic and hydrophilic segment which is sensitive to pH. In some aspects, the polymers form a micelle which is sensitive to pH and results in a change in fluorescence based upon the particular pH. In some aspects, the disclosure also provides methods of using the polymers for the imaging of cellular or extracellular environment or delivering a drug.

A crosslinked polyolefin separator which has gels with a longer side length of 50 μm or more in a number ranging from 0 to 3 per 1 m.sup.2 of the separator, and shows a standard deviation of absorbance ratio between the center of the separator and the side thereof ranging from 0.01 to 0.5 is provided. A method for manufacturing the crosslinked polyolefin separator is also provided. The method includes (S1) preparing a polyolefin porous membranes, and (S2) applying a coating solution containing an initiator and alkoxy group-containing vinylsilane onto at least one surface of the porous membrane. The coating solution can permeate even to the inside of exposed pores. Thus, it is possible to provide a crosslinked polyolefin separator in which silane crosslinking occurs uniformly even inside of the pores.

A crosslinked polyolefin separator which has gels with a longer side length of 50 μm or more in a number ranging from 0 to 3 per 1 m.sup.2 of the separator, and shows a standard deviation of absorbance ratio between the center of the separator and the side thereof ranging from 0.01 to 0.5 is provided. A method for manufacturing the crosslinked polyolefin separator is also provided. The method includes (S1) preparing a polyolefin porous membranes, and (S2) applying a coating solution containing an initiator and alkoxy group-containing vinylsilane onto at least one surface of the porous membrane. The coating solution can permeate even to the inside of exposed pores. Thus, it is possible to provide a crosslinked polyolefin separator in which silane crosslinking occurs uniformly even inside of the pores.

The present invention relates to a modified polyisobutylene polymer for rubber compounding including polyisobutylene having isobutylene as a main chain, unsaturated dicarboxylic anhydride, and a silane compound, and more particularly, 20 to 80 wt % of polyisobutylene having isobutylene as a main chain, 1 to 20 wt % of unsaturated dicarboxylic anhydride, and 1 to 60 wt % of a silane compound. In particular, when the polyisobutylene polymer of the present invention is used as an additive for rubber, the dispersibility of a filler can be significantly increased and both grip performance and rolling resistance can be improved.

The present invention relates to a modified polyisobutylene polymer for rubber compounding including polyisobutylene having isobutylene as a main chain, unsaturated dicarboxylic anhydride, and a silane compound, and more particularly, 20 to 80 wt % of polyisobutylene having isobutylene as a main chain, 1 to 20 wt % of unsaturated dicarboxylic anhydride, and 1 to 60 wt % of a silane compound. In particular, when the polyisobutylene polymer of the present invention is used as an additive for rubber, the dispersibility of a filler can be significantly increased and both grip performance and rolling resistance can be improved.

The present invention relates to a modified polyisobutylene polymer for rubber compounding including polyisobutylene having isobutylene as a main chain, unsaturated dicarboxylic anhydride, and a silane compound, and more particularly, 20 to 80 wt % of polyisobutylene having isobutylene as a main chain, 1 to 20 wt % of unsaturated dicarboxylic anhydride, and 1 to 60 wt % of a silane compound. In particular, when the polyisobutylene polymer of the present invention is used as an additive for rubber, the dispersibility of a filler can be significantly increased and both grip performance and rolling resistance can be improved.

Provided is a modified vinyl alcohol polymer which is superior in water solubility, viscosity stability of an aqueous solution thereof, and water resistance of a film thereof. The modified vinyl alcohol polymer has a group represented by the following formula (1). In the formula (1), R.sup.1 represents: an alkyl group having 1 to 8 carbon atoms; an alkoxy group having an alkyl group having 1 to 8 carbon atoms; a hydroxy group; or a group represented by -OM, wherein M represents an alkali metal or an alkaline earth metal, R.sup.2 represents a group including a siloxane structure, and n is an integer of 1 to 3.

##STR00001##

Provided is a modified vinyl alcohol polymer which is superior in water solubility, viscosity stability of an aqueous solution thereof, and water resistance of a film thereof. The modified vinyl alcohol polymer has a group represented by the following formula (1). In the formula (1), R.sup.1 represents: an alkyl group having 1 to 8 carbon atoms; an alkoxy group having an alkyl group having 1 to 8 carbon atoms; a hydroxy group; or a group represented by -OM, wherein M represents an alkali metal or an alkaline earth metal, R.sup.2 represents a group including a siloxane structure, and n is an integer of 1 to 3.

##STR00001##

Provided is a modified vinyl alcohol polymer which is superior in water solubility, viscosity stability of an aqueous solution thereof, and water resistance of a film thereof. The modified vinyl alcohol polymer has a group represented by the following formula (1). In the formula (1), R.sup.1 represents: an alkyl group having 1 to 8 carbon atoms; an alkoxy group having an alkyl group having 1 to 8 carbon atoms; a hydroxy group; or a group represented by -OM, wherein M represents an alkali metal or an alkaline earth metal, R.sup.2 represents a group including a siloxane structure, and n is an integer of 1 to 3.

##STR00001##