TOPIC: Today I read a sentence that ....

I always say, with your help, I've made progress in English.Today I read a sentence that use "as" to express the same meaning, as follows:
As the technology improves, smart clothes will get much smarter.
I'm wondering whether we can use both words interchangeable. I read the two sentences carefully . I guess we can put a sentence following "as". We only can put words following "with". Could you please tell if I'm right?

You asked about the use of "with" and "as", and you gave the following example use of "as":
"As th technology improves, smart clothes will get much smarter."
Yes, you are correct. After "as" we can use a clause (a subject+finite verb+complement), whereas after "with" we can have a noun or noun pharse. " As" (in your example) is a conjunction meaning "while";CONJUNCTIONS, you will recall, are for joining clauses to the rest of the sentence. "With" is a preposition;PREPOSITIONS are for joining nouns to the rest of the sentence.
No. these two words normally cannot be used interchangeABLY. But in your example, we could use either to express a similar, as follows:
"AS the technology improves, smart clothes will get much smarter."
"WITH the IMPROVEMENT OF technology,smart clothes will get much smarter."