classification of composite materials

[Axel]

Good evening, I'm investigating what types of matrices used in naval composites are. I have a doubt that no text or site regarding these materials has managed to solve?

1) what difference is there, if there is, between polyester resins and polyester resins insaturated?

2) polyester resins and vinylesters are thermo-hardening polymers, but are vinylesters a subgroup of polyesters or not?

3)you should tell me whether polyester dicyclopentadienic resins and phenolic resins are actually used in the naval field or are only used by a few "experiencers".

4) the matrices made with thermoplastic polymers besides being used for the production of canoes and kayaks (in polyethylene) are effectivemeente used in the nautical above 10 meters?


thanks appetizer for availability :smile:

 

[Onda]

1) from dictionary treccani online:

and s. m. [comp. di poli- e estere] (with adjective or special function, it is mostly used as invar.) – in organic chemistry, macromolecule containing numerous characteristic groups of esters, that is, resulting from the condensation of an acid and an alcole both polyfunctional. insaturated polyester resins, those formed by acids and unsaturated alcohols: they have the possibility to add compounds, also unsaturated, which establish transversal bonds between their macromolecules, for which they are substances with reticular structure, used, in combination with fibrous materials (cotton, asbestos, glass fibers, etc.), for the manufacture of molding of light, robust, resistant artifacts, used in the electrical, mechanical, construction and aeronautical industry. polyester sature resins, those obtained by polycondensation of ethylene glycol and tereftalic acid or its methyl ester, used for the preparation of films and fibres used in clothing, furnishing and industrial plants.

are not used other polyesters in the nautical that the insatura.

2) you mean by subgroup: are two different resins, look for example: http://pslc.ws/italian/composit.htm3) phenolics in the nautical field for what I know are not used. perhaps in the naval field for non-structural components as they have good properties to the flame. (not flammable), they are very used in aeronautics for this reason for the interior components.

dicyclopentadienics are used in the nautical field. see for example http://www.velisti-nonsolopercaso.it/default.asp?site_id=500&title=manutenzione&modcnt=184) never seen in the boat above 10m.

antipathetic wave

 

[Axel]

thanks wave for the response cmq

 

[Axel]

Since polyesters fall (orthoptalic,hysoftalic,bisphenolic and dicyclopentadienic) I have seen that on the manufacturer's website http://www.prochima.it/pages/res_pol.htm under the heading polyester resins in addition to the above-mentioned resins also makes the vinylesters, this was the cause of doubt

 

[Onda]

I am not a chemist, and use 90% epoxy resins, so not a great expert. But it seems clear to me.
we say that in the nautical one uses three categories:
Polyester
vinylesters
epoxy

then for each category there is one or more worlds to discover

wave

 

[Axel]

Thanks again wave, I am trying to verify the depth of what reported in this regard on some university dispenses and on a thesis in which a treatment on composite materials in the marine...I realize that moving from understanding how the purely naval design develops to the world of nautical is hard enough

 

[Axel]

wave excuse if I still take advantage of your availability, I found that next to many polyester resins of any kind they are in most cases there are 2 types of words. . . accelerated that there is the accelerator inside the resin and therefore should not be added apart... and then there is the tyssotropic or tixotropic wording..that I don't understand well what it is to indicate. I found: "It is the property of some pseudo-plastic fluids to vary their aeriformity when subjected to cutting stresses or in the case of long periods of quiet or subjected to peristaltic movements . In these conditions the fluid can pass from the almost solid pasty fat to that of liquid or, more generally, from that of gel to that of liquid is a few words. Thank you.

 

[Onda]

generally it is used to indicate those resins or thickeners that are able to transform a liquid resin into gel and thus allows better processing on vertical or reversed surfaces. it is also used for glues always with the same meaning.

if it's the correct use of the term I have no idea. but it is definitely the current use.

for example it is said that silica powder is tixotropic because it makes resin a gel.

 

[Axel]

wave excuse if you destroy again, peeking among the products of one of the largest companies of marine composite resins i.e. dsm I have seen that it has a wide range of vinylsteries and divided them into three types ...to bisphenol a, uretaniche and novolak... would you tell me if they are ulized in the nautical field? Thanks again

 

[Onda]

I'm sorry, you're really beyond my field and beyond my knowledge.

I don't know how to ask them directly. very often manufacturers also make explanation books. Try to feel if they do something.

Hi.
wave

 

[Axel]

Thank you cmq, I sent a couple of emails to the customer service of the producers hoping that they answer me. I have made an idea, however, that they are new mixed systems... they are not classified as vinyl or as epoxy.. in the naval field I have found from the brochures that 2 types of these systems...resine vinilesteri epossidiche al bisphenol a and vinylesteri epossidiche uretaniche. the continuous research and are mainly used in manual laminzaion.