تأثیر هوازدگی بر خواص سطح چند سازه های چوب- پلی اتیلن با دانسیته بالا

نوع مقاله: مقاله پژوهشی

نویسندگان

1 استادیار گروه علوم و صنایع چوب و کاغذ، دانشگاه زابل، زابل، ایران

2 دانشیار گروه تکنولوژی و مهندسی چوب، دانشگاه علوم کشاورزی و منابع طبیعی گرگان، گرگان، ایران

3 استادیار گروه تکنولوژی و مهندسی چوب، دانشگاه علوم و کشاورزی و منابع طبیعی گرگان، گرگان، ایران

4 دانشیار گروه شیمی، دانشگاه تهران، تهران، ایران

5 استاد گروه پلاستیک، پژوهشگاه پلیمر و پتروشیمی ایران، تهران، ایران

چکیده

در این مطالعه، تأثیر هوازدگی بر خواص سطح چند سازه های چوب- پلی اتیلن با دانسیته بالا بررسی شد. عوامل متغیر شامل میزان ماده نانو دی اکسید تیتانیوم (0، 1، 2 و 3 درصد)، نوع ماده اولیه (چوب تیمار حرارتی شده و چوب بدون تیمار) و تثبیت کننده نوری (0 و 1 درصد) بودند. شاخص روشنایی (L*) و تغییر رنگ (∆E) در زمان های 0، 500، 1000 و 1500 ساعت بررسی گردیدند. تغییرات شیمیایی و تخریب سطحی که در نتیجه هوازدگی بوجود آمدند نیز با استفاده از طیف سنجی تبدیل فوریه مادون قرمز (FTIR) و میکروسکوپ الکترونی (SEM) قبل و بعد از 1500 ساعت هوازدگی آنالیز شدند. طیف سنجی تبدیل فوریه مادون قرمز (FTIR) چند سازه های چوب پلاستیک نشان داد که بعد از هوازدگی، شاخص کربونیل افزایش و شاخص چوب کاهش پیدا کرد. میکروسکوپ الکترونی (SEM) نیز نشان داد که نمونه های هوازده شده دچار تخریب سطحی شده اند. چند سازه های چوب پلاستیک حاوی نانو ذرات دی اکسید تیتانیوم، ترموود (چوب تیمار حرارتی شده) و تینوین 328 (تثبیت کننده نوری)، ترک های سطحی کمتری بعد از هوازدگی در مقایسه با نمونه شاهد از خود نشان دادند. تغییرات شاخص کربونیل و شاخص چوب نمونه های حاوی نانو ذرات دی اکسید تیتانیوم، ترموود و تینوین 328، بعد از هوازدگی در مقایسه با نمونه شاهد کاهش پیدا کرد. نتایج همچنین نشان داد که شاخص روشنایی و تغییر رنگ نمونه ها بعد از هوازدگی افزایش پیدا کرد. با استفاده از نانو دی اکسید تیتانیوم، ترموود و تینوین 328، ثبات رنگ چند سازه های چوب پلاستیک بهبود بخشیده شد.

کلیدواژه‌ها

موضوعات


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