\u0110\u00e0n h\u1ed3i l\u00e0 t\u00ednh ch\u1ea5t qu\u00fd gi\u00e1 c\u1ee7a cao su. Theo c\u00e1c ph\u00e9p \u0111o d\u1ea1c, cao su thi\u00ean nhi\u00ean khi k\u00e9o c\u0103ng t\u0103ng \u0111\u1ed9 d\u00e0i g\u1ea5p 9 l\u1ea7n sau \u0111\u00f3 v\u1eabn c\u00f3 th\u1ec3 ph\u1ee5c h\u1ed3i tr\u1edf l\u1ea1i \u0111\u1ed9 d\u00e0i ban \u0111\u1ea7u. V\u1ec1 m\u1eb7t n\u00e0y, tuy\u1ec7t \u0111\u1ea1i \u0111a s\u1ed1 c\u00e1c ch\u1ea5t li\u1ec7u \u0111\u1ec1u kh\u00f4ng b\u00ec k\u1ecbp cao su: T\u00ednh n\u0103ng co – d\u00e3n – c\u1ee9ng – m\u1ec1m.<\/p>\n\n\n\n
Cao su thi\u00ean nhi\u00ean \u0111\u01b0\u1ee3c tr\u00edch t\u1eeb nh\u1ef1a c\u00e2y cao su. T\u1eeb h\u01a1n 100 n\u0103m tr\u01b0\u1edbc, c\u00e1c nh\u00e0 khoa h\u1ecdc \u0111\u00e3 b\u1eaft \u0111\u1ea7u nghi\u00ean c\u1ee9u th\u00e0nh ph\u1ea7n cao su thi\u00ean nhi\u00ean. C\u00e1c nh\u00e0 khoa h\u1ecdc cho cao su v\u00e0o b\u00ecnh v\u00e0 gia nhi\u1ec7t trong ch\u00e2n kh\u00f4ng, ng\u01b0\u1eddi ta g\u1ecdi \u0111\u00f3 l\u00e0 bi\u1ec7n ph\u00e1p ch\u01b0ng kh\u00f4. Sau khi ch\u01b0ng kh\u00f4 ng\u01b0\u1eddi ta thu \u0111\u01b0\u1ee3c m\u1ed9t ch\u1ea5t l\u1ecfng. Nghi\u00ean c\u1ee9u th\u00e0nh ph\u1ea7n ch\u1ea5t l\u1ecfng ng\u01b0\u1eddi ta t\u00ecm th\u1ea5y m\u1ed7i ph\u00e2n t\u1eed ch\u1ea5t l\u1ecfng c\u00f3 5 nguy\u00ean t\u1eed cacbon v\u00e0 8 nguy\u00ean t\u1eed hy\u0111ro, h\u1ee3p ch\u1ea5t c\u00f3 t\u00ean l\u00e0 “izopren”.<\/p>\n\n\n\n
Ng\u01b0\u1eddi ta \u0111\u1eb7t ra c\u00e2u h\u1ecfi li\u1ec7u c\u00f3 th\u1ec3 t\u1eeb h\u1ee3p ch\u1ea5t \u0111\u01a1n gi\u1ea3n izopren ch\u1ebf t\u1ea1o \u0111\u01b0\u1ee3c cao su thi\u00ean nhi\u00ean ph\u1ee9c t\u1ea1p kh\u00f4ng? \u0110\u1ebfn n\u0103m 1897 c\u00e2u h\u1ecfi n\u00e0y \u0111\u00e3 \u0111\u01b0\u1ee3c gi\u1ea3i quy\u1ebft. V\u00e0o th\u1eddi b\u1ea5y gi\u1edd, nh\u00e0 ho\u00e1 h\u1ecdc Ph\u00e1p l\u00e0 Bousalt \u0111\u00e3 ti\u1ebfn h\u00e0nh ch\u01b0ng kh\u00f4 cao su thi\u00ean nhi\u00ean v\u00e0 thu \u0111\u01b0\u1ee3c izopren. Sau \u0111\u00f3 khi th\u00eam HCl v\u00e0o izopren v\u00e0 \u0111em gia nhi\u1ec7t, \u00f4ng l\u1ea1i nh\u1eadn \u0111\u01b0\u1ee3c h\u1ee3p ch\u1ea5t gi\u1ed1ng v\u1edbi cao su thi\u00ean nhi\u00ean. \u0110em s\u1ea3n ph\u1ea9m n\u00e0y ch\u01b0ng kh\u00f4, l\u1ea1i \u0111\u01b0\u1ee3c izopren.<\/p>\n\n\n\n
\u0110\u00f3 l\u00e0 m\u1ed9t ph\u00e1t hi\u1ec7n h\u1ebft s\u1ee9c tr\u1ecdng \u0111\u1ea1i. N\u1ebfu xem cao su thi\u00ean nhi\u00ean l\u00e0 m\u1ed9t c\u0103n ph\u00f2ng, th\u00ec izopren ch\u00ednh l\u00e0 nh\u1eefng vi\u00ean g\u1ea1ch x\u00e2y n\u00ean c\u0103n ph\u00f2ng \u0111\u00f3. Ph\u00e2n t\u1eed cao su thi\u00ean nhi\u00ean \u0111\u01b0\u1ee3c t\u1ea1o th\u00e0nh do c\u00e1c ph\u00e2n t\u1eed izopren nh\u1ecf k\u1ebft n\u1ed1i v\u1edbi nhau th\u00e0nh m\u1ed9t d\u00e2y x\u00edch d\u00e0i.<\/p>\n\n\n\n
Do trong ph\u00e2n t\u1eed lu\u00f4n c\u00f3 chuy\u1ec3n \u0111\u1ed9ng, trong khi chuy\u1ec3n \u0111\u1ed9ng c\u00e1c ph\u00e2n t\u1eed nh\u1ecf lu\u00f4n co k\u00e9o l\u1eabn nhau. Do \u0111\u00f3 ph\u00e2n t\u1eed l\u1edbn cao su thi\u00ean nhi\u00ean kh\u00f4ng ph\u1ea3i \u1edf tr\u1ea1ng th\u00e1i d\u00e2y x\u00edch th\u1eb3ng m\u00e0 l\u00e0 cu\u1ed9n r\u1ed1i r\u1eafm, nhi\u1ec1u ph\u00e2n t\u1eed s\u1ebd t\u1ef1 h\u1ee3p nhau nh\u01b0 m\u1ed9t m\u1edb d\u00e2y h\u1ed7n lo\u1ea1n. V\u00ec v\u1eady ch\u00fang ta c\u00f3 th\u1ec3 t\u01b0\u1edfng t\u01b0\u1ee3ng khi ta d\u00f9ng l\u1ef1c k\u00e9o c\u0103ng, chu\u1ed7i ph\u00e2n t\u1eed r\u1ed1i r\u1eafm n\u00e0y s\u1ebd b\u1ecb c\u0103ng ra, khi th\u00f4i k\u00e9o c\u0103ng, chu\u1ed7i ph\u00e2n t\u1eed l\u1ea1i co v\u1ec1 tr\u1ea1ng th\u00e1i c\u0169.<\/p>\n\n\n\n
Cao su c\u00f3 t\u00ednh \u0111\u00e0n h\u1ed3i r\u1ea5t t\u1ed1t, ngo\u00e0i vi\u1ec7c l\u00e0m s\u0103m l\u1ed1p c\u00e1c lo\u1ea1i xe, ng\u01b0\u1eddi ta c\u00f2n d\u00f9ng cao su l\u00e0m v\u1eadt ch\u1ed1ng rung. Trong \u00f4 t\u00f4, t\u00e0u ho\u1ea3, t\u00e0u thuy\u1ec1n, c\u1ea7u c\u1ed1ng \u0111\u1ec1u c\u00f3 d\u00f9ng cao su l\u00e0m v\u1eadt li\u1ec7u ch\u1ed1ng rung.<\/p>\n\n\n\n
T\u1eeb kho\u00e1: Cao su; Izopren.<\/p>\n\n\n\n
<\/p>\n\n\n\n\n\n\n","protected":false},"excerpt":{"rendered":"
\u0110\u00e0n h\u1ed3i l\u00e0 t\u00ednh ch\u1ea5t qu\u00fd gi\u00e1 c\u1ee7a cao su. Theo c\u00e1c ph\u00e9p \u0111o d\u1ea1c, cao su thi\u00ean nhi\u00ean khi k\u00e9o c\u0103ng t\u0103ng \u0111\u1ed9 d\u00e0i g\u1ea5p 9 l\u1ea7n sau \u0111\u00f3 v\u1eabn c\u00f3 th\u1ec3 ph\u1ee5c h\u1ed3i tr\u1edf l\u1ea1i \u0111\u1ed9 d\u00e0i ban \u0111\u1ea7u. V\u1ec1 m\u1eb7t n\u00e0y, tuy\u1ec7t \u0111\u1ea1i \u0111a s\u1ed1 c\u00e1c ch\u1ea5t li\u1ec7u \u0111\u1ec1u kh\u00f4ng b\u00ec k\u1ecbp […]<\/p>\n","protected":false},"author":1,"featured_media":0,"comment_status":"closed","ping_status":"open","sticky":false,"template":"","format":"standard","meta":{"footnotes":"","_disable_autopaging":false},"categories":[8,15],"tags":[],"class_list":["post-7862","post","type-post","status-publish","format-standard","hentry","category-hoa-hoc","category-hoi-dap-khoa-hoc"],"_links":{"self":[{"href":"https:\/\/www.vietlearn.org\/kien-thuc\/wp-json\/wp\/v2\/posts\/7862","targetHints":{"allow":["GET"]}}],"collection":[{"href":"https:\/\/www.vietlearn.org\/kien-thuc\/wp-json\/wp\/v2\/posts"}],"about":[{"href":"https:\/\/www.vietlearn.org\/kien-thuc\/wp-json\/wp\/v2\/types\/post"}],"author":[{"embeddable":true,"href":"https:\/\/www.vietlearn.org\/kien-thuc\/wp-json\/wp\/v2\/users\/1"}],"replies":[{"embeddable":true,"href":"https:\/\/www.vietlearn.org\/kien-thuc\/wp-json\/wp\/v2\/comments?post=7862"}],"version-history":[{"count":0,"href":"https:\/\/www.vietlearn.org\/kien-thuc\/wp-json\/wp\/v2\/posts\/7862\/revisions"}],"wp:attachment":[{"href":"https:\/\/www.vietlearn.org\/kien-thuc\/wp-json\/wp\/v2\/media?parent=7862"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"https:\/\/www.vietlearn.org\/kien-thuc\/wp-json\/wp\/v2\/categories?post=7862"},{"taxonomy":"post_tag","embeddable":true,"href":"https:\/\/www.vietlearn.org\/kien-thuc\/wp-json\/wp\/v2\/tags?post=7862"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}