Basic Questions for any Kantians An elementary particle is a phainomenon. Understanding how it is to be one a noumenon. We can describe how it interacts with other particles in spacetime, as a phainomenon, but the particle an Sich can only be known as a noumenon.
I think Kant means something along the following lines. If you put yourself in a particle's shoes it depends on the particles around you how you feel, and basically there is the feeling of to be with them or not to be with them (that's the question...). At the most fundamental level, massless charges feel so attracted by each other that they only can exist in massive triplets, which can have color and electric charge. The further colored triplets (quarks) are apart, the stronger they feel one another pull. Colorless states like protons, neutrons, electrons, and neutrinos are formed. An electron (a triplet of massless particles feeling hyperbolically attracted) has a will, a primordial consciousness, to be with, say, a proton. They reach out to other charged particles, and reaches out to an oppositely charged proton because it wants to be together with it. But how does that feel? An electron feels pure love for the proton and pure hate for another electron. The latter interaction mixes up the identities of both electrons. What love is supposed to do is actually achieved by hate on the fundamental level!
So fundamentally there are love and hate only. Without further embellishments. Love and hate defined as longing to be or not longing to be with other particles. There is no deeper reason for this primordial love affairs. You can describe them by in physical terms, like charge, emission and absorption of virtual particles in spacetime, but in doing so you don't really understand the nature of the fundamental states of (love) affairs. Two oppositely electrically charged particles literally feel attracted. They run towards each other but can't kiss as they combine in a neutral state in which they get close but never touch (real touching is achieved in the depths of black holes, but as soon as zillions of particles kiss simultaneously they get annihilated by negative energy particles, negative love, that is, so the perfect kiss only lasts the blink of an eye...).
The electron hops around the proton nervously, longing for the kiss. The proton watches amused and realizes he needs the electron just as much as she needs him. Only interference by other charges outside can end their happy relation. A rapid evil expansion of the space between them has the same disastrous consequence. So even if one happy pair has survived all universal turmoil, the evil expansion, speeding up and up, will break them up eventually. But... an electron and three quarks (uud) contain unequal amounts of matter and antimatter, so luckily for the electron and proton, this only happens in fairy tales with no happy ending. Imagine a single lonely electron looking for a lonely single proton in a vast inflating space... Reaching out in vain...
So what can we learn from this? Love is a noumenal entity, the expression and description by means of spacetime, charge, mediating fields, etcetera, the phainomenon counterpart. The phainomenon cannot be used to explain the noumenon. Matter cannot explain consciousness.