A polymer compound is provided which is changed from a water-insoluble state to a water-soluble state by irradiation with light. The polymer compound is represented by Formula (5), where A and B are a single bond or a functional group, R.sup.3, R.sup.4, and R.sup.9 are hydrogen or an alkyl group, and R.sup.6 and R.sup.7 are hydrogen, an alkyl group, or the like.

A polymer compound is provided which is changed from a water-insoluble state to a water-soluble state by irradiation with light. The polymer compound is represented by Formula (5), where A and B are a single bond or a functional group, R.sup.3, R.sup.4, and R.sup.9 are hydrogen or an alkyl group, and R.sup.6 and R.sup.7 are hydrogen, an alkyl group, or the like.

In an embodiment, the present disclosure pertains to a method of changing the glass transition temperature of a polymer. In some embodiments, the polymer includes at least one hydrazone-containing compound. In general, the methods of the present disclosure include one or more of the following steps of: (1) applying light to the polymer; and (2) thereby changing the glass transition temperature of the polymer. In another embodiment, the present disclosure pertains to a polymer having a light-adjustable glass transition temperature. In some embodiments, the polymer includes at least one hydrazone-containing compound.

A process for fabricating a thermochromic film is disclosed which includes the steps of dispersing a predetermined amount of vanadium dioxide (VO.sub.2) nanoparticles in a predetermined amount of poly(methyl methacrylate) (PMMA), stirring a mixture thereof for a first predetermined amount of time, generating cross-links to molecule chains of the PMMA in the mixture, and blade coating a predetermined thickness of the cross-linked mixture on a substrate to form the thermochromic film.

A process for fabricating a thermochromic film is disclosed which includes the steps of dispersing a predetermined amount of vanadium dioxide (VO.sub.2) nanoparticles in a predetermined amount of poly(methyl methacrylate) (PMMA), stirring a mixture thereof for a first predetermined amount of time, generating cross-links to molecule chains of the PMMA in the mixture, and blade coating a predetermined thickness of the cross-linked mixture on a substrate to form the thermochromic film.

A curable polyorganosiloxane composition includes (a) a polyorganosiloxane having two or more curable functional groups per molecule; (b) a crosslinking agent having per molecule two or more crosslinkable groups having reactivity with the curable functional groups of the component (a); (c) a curing catalyst capable of catalyzing a crosslinking reaction of the component (a) and the component (b); (d) a pigment which itself does not emit a fluorescent light; and (e) a UV tracer. The composition can be used as an adhesive.

A curable polyorganosiloxane composition includes (a) a polyorganosiloxane having two or more curable functional groups per molecule; (b) a crosslinking agent having per molecule two or more crosslinkable groups having reactivity with the curable functional groups of the component (a); (c) a curing catalyst capable of catalyzing a crosslinking reaction of the component (a) and the component (b); (d) a pigment which itself does not emit a fluorescent light; and (e) a UV tracer. The composition can be used as an adhesive.

A defoamer or anti-foam formulation and a process for preparing the same. The process includes in a first step, preparing branched organopolysiloxanes (A) by irradiating organopolysiloxanes (X) of the formula (1)

R.sup.1.sub.3-a(R.sup.2O).sub.aSi—[OSiR.sup.3.sub.2].sub.n—OSi(OR.sup.2).sub.aR.sup.1.sub.3-a   (1).

Where with high-energy radiation, the viscosity of the organopolysiloxanes (A) is at least 40% higher than the viscosity of the organopolysiloxanes (X). In a second step, the branched organopolysiloxanes (A) are treated with a filler (B) which is selected from precipitated and/or fumed silicas, and organopolysiloxane resins (C).

A defoamer or anti-foam formulation and a process for preparing the same. The process includes in a first step, preparing branched organopolysiloxanes (A) by irradiating organopolysiloxanes (X) of the formula (1)

R.sup.1.sub.3-a(R.sup.2O).sub.aSi—[OSiR.sup.3.sub.2].sub.n—OSi(OR.sup.2).sub.aR.sup.1.sub.3-a   (1).

Where with high-energy radiation, the viscosity of the organopolysiloxanes (A) is at least 40% higher than the viscosity of the organopolysiloxanes (X). In a second step, the branched organopolysiloxanes (A) are treated with a filler (B) which is selected from precipitated and/or fumed silicas, and organopolysiloxane resins (C).

A photocurable silicone composition is disclosed. A cured product of the composition is also disclosed, as well as methods of forming the same. The photocurable silicone composition comprises: (A) a specific organopolysiloxane having alkenyl groups in a molecule; (B) a compound having at least two thiol groups in a molecule; (C) a photoradical initiator having a phosphorus atom; and (D) a specific hydroxyphenyl triazine compound. The composition exhibits excellent curability by LED lamp with wide UV-Visible range as well as metal-halide lamp, and cures to form a cure product exhibiting excellent resistance to light.